9/23/2013. Introduction CHAPTER 7 SLOPE PROCESSES, LANDSLIDES, AND SUBSIDENCE. Case History: La Conchita Landslide
|
|
- Anis O’Connor’
- 5 years ago
- Views:
Transcription
1 Introduction CHAPTER 7 SLOPE PROCESSES, LANDSLIDES, AND SUBSIDENCE Landslide and other ground failures posting substantial damage and loss of life In U.S., average deaths; damage more than $3.5 billion For convenience, definition of landslide includes all forms of mass-wasting movements Landslide and subsidence: occurs naturally and affected by human activities Case History: La Conchita Landslide 1995 Slide La Conchita: small coastal community 80 km (50 mi) northwest of Los Angeles Landslide occurred on January 10, 2005 Triggered by heavy rainfall, reactivation along an older landslide surface (35,000 years ago, 6000 years ago, and 1995) Debris flow up to 45 km/h (30 mph) La Conchita should not be built on the landslide deposits and under the foot of the slope Potential solution: relocate people and better land use regulation 2005 Slide 1
2 Slope Processes (1) Slopes: The most common landforms Consists of cliff face (free face) and talus slope or upper convex slope, a straight slope, and a lower concave slope Slope Processes (2) Dynamic evolving feature, depending upon topography, rock types, climate, vegetation, water, and geologic time Materials constantly moving down the slope at varied rates Types of Landslides (1) Slow or rapid failure of slope: Slope gradient, type of slope materials, amount of water present, rate of movement Rate of movement: Imperceptible creep to thundering avalanches Types: Creep, sliding, slumping, falling, flowage or flow, and complex movement (sliding and flowage) Types of Landslides (2) 2
3 Soil Slip Debris Flow Rockfall, Yosemite Home Destroyed, 2 Lives Lost Stream Erosion Soil Slip on Steep Slope Roots too shallow! 3
4 Beachfront Erosion Japanese Landslide Tennessee Landslide Why slip surfaces are curved Driving vs. Resisting Forces can change 4
5 Slope Stability Safety Factor SF = Resisting Forces/Driving Forces If SF >1, then safe or stable slope If SF <1, then unsafe or unstable slope Imagine the following situation Driving and resisting forces determined by the interrelationships of the following variables: Existing slip surface Type of Earth materials Slope angle and topography Climate, vegetation, and water Time Geologists need to do some math Geologists need to do some math Vector diagram illustrating relationships between vectors D (the weight downslope, given by WsinΘ 2 ), N (the normal force or force perpendicular to the slope), and W, the overall weight of the material in the situation. Using some trigonometry and information on the materials involved, the Safety Factor can be caluclated. FS = Safety Factor S = shear strength of the material, in this case a clay L = Length of slip plane T = Unit thickness W = weight of the overlying material SF > 1.25 is best. SF for curved slip surfaces can be estimated For a curved slip surface, using the rotational geometry and applying the idea of torque (force around a moment arm) instead of direct force. The safety factor is still the ratio of resisting to driving forces/torques. Also, note the recalculation if fluid pressure is from increased moisture content is included! Human Land Use and Landslide Urbanization, irrigation Timber harvesting in weak, relatively unstable areas Artificial fillings of loose materials Artificial modification of landscape Dam construction 5
6 Warning of Impending Landslides Monitoring changes Human surveillance Instrumental survey: Tilt meter and geophones Landslide warning system Info for public awareness and education Enough time for public evacuation Stop or reroute traffic flow Emergency services The Vaiont Dam Disaster The Vaiont Dam Disaster On October 9, lives were lost due to a massive landslide and subsequent flood in northern Italy. 238 million cubic meters of material slid into the nearly full reservoir, moving at speeds of nearly 60 mph. The displaced water made a wave 90 (~300 feet) meters high that swept over the dam and down the valley, drowning people and washing away homes in the valley below the dam. Monitoring for 3-years leading up to the disaster showed variable rates of slip from 1-30 cm per week. Starting in September 1963, slip increased to 25 cm per day and finally up to 1 m per day just before the fateful night. The Vaiont Dam Disaster The Vaiont Dam Disaster 6
7 The Vaiont Dam Disaster What caused the Vaiont Dam disaster? 1. Adverse geology weak rocks with open fractures, sinkholes and weak clay layers inclined towards the reservoir. 2. Steep topography = strong driving force. 3. As the reservoir filled, water pressure increased reducing friction and weakening the clay layers even more. 4. Heavy rains in late September increased the weight of slope materials and runoff into the reservoir caused the water level to rise further in spite of attempts by engineers to lower it. Minimizing the Landslide Hazard (1) Landslide Hazard Map Identifying potential landslides Photographic analysis Topographic map and detailed field check Historic data Landslide hazard inventory map Grading code from the least stable to the most stable Application of geologic and engineering knowledge before any hillside development Minimizing the Landslide Hazard (2) Preventing landslides Drainage control: Reducing infiltration and surface runoff Slope grading: Reducing the overall slope Slope supports: Retaining walls or deep supporting piles Avoid landslide hazards Landslide warning for critical evacuations Correcting landslides 7
8 Subsidence Form of subsurface ground failure Occurred naturally or induced by human activities Retaining Walls can Prevent Mass Movements Slow settling or rapid collapse Causes: Withdrawal of fluids (water, oil and gas, steam) or removal of solid materials (dissolution, mining) 8
9 Process of Subsidence Removal of Solid Materials (1) Sinkholes Dissolution of carbonate rocks, limestone, and dolomite Affecting most of the conterminous states Natural or artificial fluctuations in water table increasing the problem Triggering other problems: Sinkholes as waste dumping sites Removal of Solid Materials (2) Salt and coal mining Salt dissolution and pumping Active coal mines and abandoned coal mines Ground failure due to depleted subsurface pressure More than 8000 km 2 of land subsidence due to underground coal mining Lake Peigneur an unexpected subsidence incident. November 21,
10 Perception of the Landslide Hazard Landslide hazard maps not preventing development Common perception: It could happen on other hillsides, but never on this one. Infrequency and unpredictability of large slides reducing awareness of the hazards Often people taking chances and unknown risks What Can You Do? (1) Professional geologic evaluation for a property on a slope Avoid building at the mouth of a canyon, regardless of its size Consult local agencies for historical records Watch signs of little slides often precursor for larger ones What Can You Do? (2) Look for signs of structure cracks or damage prior to purchase Be wary of pool leaking, tilt of trees and utility poles Look for linear cracks, subsurface water movement Put observations into perspective, one aspect may not tell the whole story 10
9/13/2011 CHAPTER 9 AND SUBSIDENCE. Case History: La Conchita Landslide. Introduction
CHAPTER 9 SLOPE PROCESSES, LANDSLIDES, AND SUBSIDENCE Case History: La Conchita Landslide La Conchita: small coastal community 80 km (50 mi) northwest of Los Angeles Landslide occurred on January 10, 2005
More informationSLOPE PROCESSES, LANDSLIDES, AND SUBSIDENCE
CHAPTER 9 SLOPE PROCESSES, LANDSLIDES, AND SUBSIDENCE La Conchita slide January 10, 2005 Triggered by heavy rainfall, reactivation along an older landslide surface (35,000 years ago, 6000 years ago, and
More informationConsists of cliff face (free-face) and talus slope or upper convex slope, a straight slope and a lower concave slope
1 2 3 4 5 6 7 8 Introduction to Environmental Geology, 5e Chapter 10 Slope Processes, Landslides, and Subsidence Mass wasting: summary in haiku form Mass wasting: downhill quickly like an avalanche, or
More informationSLOPE FAILURE SLOPES. Landslides, Mudflows, Earthflows, and other Mass Wasting Processes
GEOL g406 Environmental Geology SLOPE FAILURE Landslides, Mudflows, Earthflows, and other Mass Wasting Processes Read Chapter 5 in your textbook (Keller, 2000) Gros Ventre landslide, Wyoming S. Hughes,
More information3/8/17. #20 - Landslides: Mitigation and Case Histories. Questions for Thought. Questions for Thought
#20 - Landslides: Mitigation and Case Histories Web Exercise #3 (Volcanoes) Due Wednesday There is a 2-point penalty for every day the assignment is late. Exam 1 Scores Scores and exam key are posted Vaiont
More informationMass Wasting. Revisit: Erosion, Transportation, and Deposition
Mass Wasting Revisit: Erosion, Transportation, and Deposition While landslides are a normal part of erosion and surface processes, they can be very destructive to life and property! - Mass wasting: downslope
More informationGG101 Lecture 22: Mass Wasting. Soil, debris, sediment, and broken rock is called regolith.
GG101 Lecture 22: Mass Wasting Mass Wasting is the movement of rock and soil down a slope due to the force of gravity. Soil, debris, sediment, and broken rock is called regolith. Mass wasting creates broad
More informationMass Wasting: The Work of Gravity
Chapter 15 Lecture Earth: An Introduction to Physical Geology Twelfth Edition Mass Wasting: The Work of Gravity Tarbuck and Lutgens Chapter 15 Mass Wasting The Importance of Mass Wasting Slopes are the
More informationMass Wasting. Requirements for Mass Wasting. Slope Stability. Geol 104: mass wasting
Mass Wasting Movement of earth materials downslope, driven by Gravitational Forces. Landslides - general term for rock or soil movement. In U.S., on average, mass wasting causes 1 to 2 billion dollars
More informationChapter 11 10/30/2013. Mass Wasting. Introduction. Factors That Influence Mass Wasting. Introduction. Factors That Influence Mass Wasting
Introduction Chapter 11 Mass wasting - The downslope movement of material resulting from the force of gravity. Mass Wasting Mass wasting results when the force of gravity acting on a slope exceeds the
More informationA Homeowner s Guide to Landslides for Washington and Oregon
Protect Your Home and Property 1 A Homeowner s Guide to Landslides for Washington and Oregon Washington Geological Survey and Oregon Department of Geology and Mineral Industries LANDSLIDES ARE ONE OF THE
More information3/15/17. #22 - Subsidence - Rapid Sinkhole at Winter Park, FL in Rapid Subsidence Defined and Illustrated
Web Exercise #3 (Volcanoes) Late- closing at 1:00 today Web Exercise #4 (Landslides) DUE WEDNESDAY Use Hazard City to answer matching question in Part II #22 - Subsidence - Rapid Sinkhole at Winter Park,
More informationLearning Objectives. Your goals for studying this chapter are: Understand where landslides occur. Understand the warning signs of landslides.
Learning Objectives Landslides are common problems across the country and in many parts of the world. Next to flooding, they are the most likely natural hazard you may have to deal with in your lifetime.
More informationMass Movements. Rock Weathering. Accumulation of Debris on Slopes. Landslides 12/8/2014
Mass Movements Already talked a little about landslides with earthquakes AKA mass wasting A mass movement is any displacement of large amounts of soil down slopes over (often) a comparatively short period
More informationCOMMUNITY EMERGENCY RESPONSE TEAM FLOODS INTRODUCTION
INTRODUCTION Floods are one of the most common hazards in the United States. A flood occurs any time a body of water rises to cover what is usually dry land. Flood effects can be local, impacting a neighborhood
More informationEnvironmental Geology Lab 5 - Mass Wasting Hazards
Environmental Geology Lab 5 - Mass Wasting Hazards page - 1 Many landslides, slope failures or sinkholes (collapse structures formed in terrain underlain by limestone rocks) occur during or immediately
More informationFloods. Floods COMMUNITY EMERGENCY RESPONSE TEAM FLOODS CONTENT INSTRUCTOR GUIDANCE
Floods Floods Introduce this topic by explaining that floods are one of the most common hazards in the United States. A flood occurs any time a body of water rises to cover what is usually dry land. Display
More informationSection 3. Slopes and Landscapes. What Do You See? Think About It. Investigate. Learning Outcomes
Chapter 4 Surface Processes Section 3 Slopes and Landscapes What Do You See? Learning Outcomes In this section, you will Calculate the angle of repose for different kinds of soils and other granular materials.
More informationMulti-Jurisdictional Hazard Mitigation Plan. Table C.10 The Richter Scale. Descriptor Richter Magnitude Earthquake Effects
Geologic Hazards Earthquake Earthquakes are very rare in Pennsylvania and have caused little damage, with no reported injuries or causalities. Earthquakes that do occur in Pennsylvania happen deep within
More informationDebris flow: categories, characteristics, hazard assessment, mitigation measures. Hariklia D. SKILODIMOU, George D. BATHRELLOS
Debris flow: categories, characteristics, hazard assessment, mitigation measures Hariklia D. SKILODIMOU, George D. BATHRELLOS Natural hazards: physical phenomena, active in geological time capable of producing
More informationMass Wasting. Mass Wasting. Earth s s External Processes
1 Mass Wasting Presentation Modified from Instructor Resource Center on CD-ROM, Foundations of Earth Science, 4 th Edition, Lutgens & Tarbuck Mass Wasting 2 Down-slope movement of rock, loose material
More informationSurface Processes Focus on Mass Wasting (Chapter 10)
Surface Processes Focus on Mass Wasting (Chapter 10) 1. What is the distinction between weathering, mass wasting, and erosion? 2. What is the controlling force in mass wasting? What force provides resistance?
More informationThe Importance of Mass Wasting
Mass Wasting: The Work of Gravity Earth Chapter 15 Chapter 15 Mass Wasting The Importance of Mass Wasting Slopes are the most common elements in our physical landscape Slopes may appear to be stable, but
More informationWeathering, Mass Wasting and Karst
Weathering, Mass Wasting and Karst Capable of wearing down anything that the internal processes can build. Gravity, water, wind and ice Denudation - the overall effect of disintegration, wearing away and
More informationGeog 1000 Lecture 17: Chapter 10
Geog 1000 Lecture 17: Chapter 10 Landslides and Mass Movements Link to lectures: http://scholar.ulethbridge.ca/chasmer/classes/ Today s Lecture 1. Assignment 2 Due Pick up Assignment 1 if you don t have
More informationLandslides & Debris Flows
T.#Perron# #12.001# #Landslides#&#Debris#Flows# 1# Landslides & Debris Flows Many geologic processes, including those shaping the land surface, are slowacting, involving feedbacks that operate over many
More informationPreliminaries to Erosion: Weathering and Mass Wasting
Preliminaries to Erosion: Weathering & Mass Wasting All things deteriorate in time. Virgil 1 Preliminaries to Erosion: Weathering and Mass Wasting Denudation The Impact of Weathering and Mass Wasting on
More informationUGRC 144 Science and Technology in Our Lives/Geohazards
UGRC 144 Science and Technology in Our Lives/Geohazards Flood and Flood Hazards Dr. Patrick Asamoah Sakyi Department of Earth Science, UG, Legon College of Education School of Continuing and Distance Education
More informationLab 3. Landslides and Mass Wasting
(Revised Fall 2009) Name Lab 3. Landslides and Mass Wasting INTRODUCTION Mass wasting is a general term for a variety of processes by which earth materials move downslope as a result of gravity. The actual
More informationWATER ON AND UNDER GROUND. Objectives. The Hydrologic Cycle
WATER ON AND UNDER GROUND Objectives Define and describe the hydrologic cycle. Identify the basic characteristics of streams. Define drainage basin. Describe how floods occur and what factors may make
More information( Your responses must be complete, using terminology and concepts.
Running head: ARTICLE SUMMARY 1 Question Topic: Summary of information about website http://www.tulane.edu/~sanelson/geol204/masswastproc.htm Pages: 3 Sources: 4 Format: APA Deadline: 24 hours Instructions:
More informationCh. 8: Mass Movements, Wind and Glaciers
Ch. 8: Mass Movements, Wind and Glaciers Every day the landscape around us undergoes changes. Changes that are powered by gravity alone are called mass movement or mass wasting. Mass movement includes
More informationSESSION 6: FLUVIAL LANDFORMS
SESSION 6: FLUVIAL LANDFORMS KEY CONCEPTS: Fluvial Landforms Management of River Catchment Areas Slope Elements X-PLANATION: FLUVIAL LANDFORMS Rivers form landforms as they erode the landscape. These landforms
More informationP R E L I M I N A R Y P R O O F S Unpublished Work 2008 by Pearson Education, Inc. From the forthcoming book Introduction to Environmental Geology,
N I N E Slope Processes, Landslides, and Subsidence Learning Objectives Landslides, the movement of materials down slopes, constitute a serious natural hazard in many parts of the United States and the
More informationLandslide Mitigation (BYUI)
Landslide Mitigation (BYUI) The general principle behind landslide mitigation is stabilization. Slopes that are too steep are shallowed or strengthened. Loose rocks can be bolted or cemented into place.
More informationUnsafe Ground: Landslides and Other Mass Movements. Chapter 11. Selected landslides (causes & number of deaths) Weathering, Erosion & Mass Wasting
Weathering, Erosion & Mass Wasting Chapter 11 Weathering produces all the soils, clays, sediments, and dissolved substances. Mass Wasting Erosion is the removal of sediments by natural processes e.g. wind,
More informationBeyond the Book. FOCUS Book
FOCUS Book Suppose your city wants to build a new housing development on a steep slope outside town. Design a model to test whether the land is safe from the types of landslides you read about in this
More informationGIS AND REMOTE SENSING FOR GEOHAZARD ASSESSMENT AND ENVIRONMENTAL IMPACT EVALUATION OF MINING ACTIVITIES AT QUY HOP, NGHE AN, VIETNAM
GIS AND REMOTE SENSING FOR GEOHAZARD ASSESSMENT AND ENVIRONMENTAL IMPACT EVALUATION OF MINING ACTIVITIES AT QUY HOP, NGHE AN, VIETNAM QuocPhi Nguyen 1, Phuong Nguyen 1, ThiHoa Nguyen 2 and TienPhu Nguyen
More information3/3/2013. The hydro cycle water returns from the sea. All "toilet to tap." Introduction to Environmental Geology, 5e
Introduction to Environmental Geology, 5e Running Water: summary in haiku form Edward A. Keller Chapter 9 Rivers and Flooding Lecture Presentation prepared by X. Mara Chen, Salisbury University The hydro
More informationThe Richter Scale. Micro Less than 2.0 Microearthquakes, not felt. About 8,000/day
Geologic Hazards General s are very rare in Pennsylvania and have caused very little damage and no reported injuries or casualties. Since the Commonwealth is not on an active fault, the earthquakes that
More informationSubsidence is the sinking or collapse of a portion of the land surface. The movement involved in subsidence is essentially vertical; little or no
1 Subsidence is the sinking or collapse of a portion of the land surface. The movement involved in subsidence is essentially vertical; little or no horizontal motion is involved. It may take the form of
More informationEarthquake hazards. Aims 1. To know how hazards are classified 2. To be able to explain how the hazards occur 3. To be able to rank order hazards
Earthquake hazards Aims 1. To know how hazards are classified 2. To be able to explain how the hazards occur 3. To be able to rank order hazards Types of hazard Primary A direct result of the earthquake
More informationBell Ringer. Are soil and dirt the same material? In your explanation be sure to talk about plants.
Bell Ringer Are soil and dirt the same material? In your explanation be sure to talk about plants. 5.3 Mass Movements Triggers of Mass Movements The transfer of rock and soil downslope due to gravity is
More informationNeed of Proper Development in Hilly Urban Areas to Avoid
Need of Proper Development in Hilly Urban Areas to Avoid Landslide Hazard Dr. Arvind Phukan, P.E. Cosultant/Former Professor of Civil Engineering University of Alaska, Anchorage, USA RI District Governor
More informationErosion and Deposition
Erosion and Deposition Erosion Sediment natural forces move rock/soil from one place to another. gravity, water, wind, glaciers, waves are causes material moved by erosion Deposition when erosion lays
More informationPractical aspects of dam break analysis
Practical aspects of dam break analysis Louis C Hattingh Hattingh Anderson Associates CC Dam break analysis It is a model You need to understand what you model & have an idea of the answers that you expect
More informationEssential Questions. What is erosion? What is mass wasting?
Erosion Essential Questions What is erosion? What is mass wasting? What is Erosion? Erosion The transportation of sediment from one area to another Caused mainly by running water but also caused by glaciers,
More informationNew Topic Today. Mass Movement = Mass Wasting. =colluvial processes =slope processes =slope failures =LANDSLIDES. Landslides by U.S.
New Topic Today Mass Movement = Mass Wasting =colluvial processes =slope processes =slope failures =LANDSLIDES U.S. Landslide Risk Which states have lots of landslide damage? Landslides by U.S. Region
More informationChapter 2: Landslides and Debris Flows
Chapter 2: Landslides and Debris Flows Chapter 2: Landslides and Debris Flows Landslides and debris flows are among the major causes of flash floods in the Himalayan region as the rock, earth, debris,
More informationLANDSLIDE HAZARDS. presented during the. TRAINING-WORKSHOP ON DISASTER RISK MANAGEMENT Rakdell Inn Virac, Catanduanes 03 July 2008
LANDSLIDE HAZARDS presented during the TRAINING-WORKSHOP ON DISASTER RISK MANAGEMENT Rakdell Inn Virac, Catanduanes 03 July 2008 GEOLOGIC HAZARDS the probability of occurrence, within a specific period
More informationGEOL 1121 Earth Processes and Environments
GEOL 1121 Earth Processes and Environments Wondwosen Seyoum Department of Geology University of Georgia e-mail: seyoum@uga.edu G/G Bldg., Rm. No. 122 Seyoum, 2015 Chapter 6 Streams and Flooding Seyoum,
More informationGeologic Hazards. Montour County Multi-jurisdictional. General. Earthquake
Geologic Hazards General s are very rare in Pennsylvania and have caused little damage with no reported injuries or causalities. s that do occur in Pennsylvania happen deep within the Earth s crust. This
More informationNipigon River Landslide, Ontario, Canada
Nipigon River Landslide, Ontario, Canada A. Abdelaziz, S. Besner, R. Boger, B. Fu, J. Deng, and A. Farina Presenter: Jian Deng, Ph.D, P.Eng Centre of Excellence for Sustainable Mining and Exploration,
More informationUnsafe Ground: Landslides and Other Mass Movements
Unsafe Ground: Landslides and Other Mass Movements Mass Movements Downslope motion of earth materials by gravity. Mass movements are a type of natural hazard. Natural feature of the environment. Can cause
More informationPHYSICAL GEOGRAPHY. By Brett Lucas
PHYSICAL GEOGRAPHY By Brett Lucas WEATHERING & MASS WASTING Denudation Disintegration, wearing away, and removal of rock material Involves three activities: Weathering is the break down of rocks into smaller
More information3.12 Geology and Topography Affected Environment
3 Affected Environment and Environmental Consequences 3.12 Geology and Topography 3.12.1 Affected Environment 3.12.1.1 Earthquakes Sterling Highway MP 45 60 Project Draft SEIS The Kenai Peninsula is predisposed
More informationWeathering, Soil, and Mass Movements
Tarbuck Lutgens Weathering, Soil, and Mass Movements 5.1 Weathering Mechanical Weathering Mechanical weathering occurs when physical forces break rock into smaller and smaller pieces without changing the
More informationChapter 16 Weathering, Erosion, Mass Wasting. Chapter 16 Weathering, Erosion, Mass Wasting. Mechanical Weathering
Weathering, Erosion and Mass Wasting Weathering is the the breakdown of solid rock at or near the Earth's surface. Chapter 16 Weathering, Erosion, Mass Wasting Does weathering of rock remove or add CO
More informationUsing Weather and Climate Information for Landslide Prevention and Mitigation
Using Weather and Climate Information for Landslide Prevention and Mitigation Professor Roy C. Sidle Disaster Prevention Research Institute Kyoto University, Japan International Workshop on Climate and
More informationOrting Community College Proposal
Orting Community College Proposal Cedric, Celina, Francine, Sarah, Samuel GEO CORP Located in Washington, 42 miles south of Seattle. Situated between two rivers on fertile plains. Built on lahar deposits.
More informationMass Movement and Surface Karst
LAB #1 Mass Movement and Surface Karst Recommended Textbook Reading Prior to Lab: Chapter 15, Weathering and Mass Movement 15.2 Dissolving Rock: Karst 15.3 Unstable Ground: Mass Movement Goals: After completing
More information265 Dalewood Way alteration permit #2016/02/17/9761 June 30, 2016 Appeal #16-109 Deck at Rear due to conflict with Slope Protection Act A. Executive Summary: We are in receipt of the Notification of Structural
More informationCONTROLLING FACTORS BASIC ISSUES SAFETY IN OPENCAST MINING WITH SPECIAL REFERENCE TO SLOPE STABILITY
SAFETY IN OPENCAST MINING WITH SPECIAL REFERENCE TO SLOPE STABILITY CONTROLLING FACTORS Dr. J C. JHANWAR Sr. Principal Scientist CSIR-Central Institute of Mining & Fuel Research Regional Centre, Nagpur
More informationCHAPTER FIVE 5.0 STABILITY OF CUT SLOPES IN THE STUDY AREA. them limited by a thick canopy of vegetation and steep slope angles.
CHAPTER FIVE 5.0 STABILITY OF CUT SLOPES IN THE STUDY AREA 5.1. Introduction Ukay Perdana area is a developing community with continuous building activities and road construction. There are thus only left
More informationAyubowan. Management (CBDRM) Community Based Disaster Risk. Towards Disaster Resilient Community Developed by Disaster Management Centre,
Ayubowan Community Based Disaster Risk Management (CBDRM) Towards Disaster Resilient Community 5-20 Purpose of this activity To know the risks in community to prepare for future disasters To exchange knowledge
More informationHILLSLOPE STABILITY. Focus in the Westfork Area of Washington County, Arkansas. Environmental Geology Dr. Paul Lowrey
Environmental Geology Dr. Paul Lowrey Team Members Christine Gossett Jennifer Lane Lauren Morrison Nicole Sage Focus in the Westfork Area of Washington County, Arkansas HILLSLOPE STABILITY INTRODUCTION
More informationEROSION AND DEPOSITION
CHAPTER 8 EROSION AND DEPOSITION SECTION 8 1 Changing Earth s Surface (pages 252-255) This section explains how sediment is carried away and deposited elsewhere to wear down and build up Earth s surface.
More informationPhysical landscapes River landscapes in the UK
Physical landscapes River landscapes in the UK The shape of river valleys change s as rivers flow downstream - PROCESSES Erosion Abrasion or corrasion Attrition Hydraulic Action Solution or corrosion Deposition
More informationLand Subsidence. Land subsidence is defined as the lowering of the land surface.
Land Subsidence Land subsidence is defined as the lowering of the land surface. Many different factors can cause the land surface to subside. Subsidence can occur rapidly due to: a sinkhole or under ground
More informationRapid Changes on Earth: Earthquakes, Volcanoes, Landslides. Chapter 6 Study Guide
Rapid Changes on Earth: Earthquakes, Volcanoes, Landslides Chapter 6 Study Guide Magma is 1. The point underground where an earthquake starts. 2. Molten rock beneath the Earth s surface. 3. Molten rock
More information12 10 8 6 4 2 0 40-50 50-60 60-70 70-80 80-90 90-100 Fresh Water What we will cover The Hydrologic Cycle River systems Floods Groundwater Caves and Karst Topography Hot springs Distribution of water in
More informationAN APPROACH TO THE CLASSIFICATION OF SLOPE MOVEMENTS
Training/workshop on Earthquake Vulnerability and Multi-Hazard Risk Assessment: Geospatial Tools for Rehabilitation and Reconstruction Effort 13 31 March 2006, Islamabad, Pakistan AN APPROACH TO THE CLASSIFICATION
More information8. Mass movements. Engineering Geology. Engineering Geology is backbone of civil engineering. Eng. Iqbal Marie
Engineering Geology Engineering Geology is backbone of civil engineering 8. Mass movements Eng. Iqbal Marie All images are taken from the net and not credited to me Mass-Wasting is the down slope movement
More informationErupted and killed approximately 15,000 people 200 years ago
1 2 3 4 5 6 7 8 Introduction to Environmental Geology, 5e Chapter 8 Volcanic Activity Volcanoes: summary in haiku form A volcano forms. Magma comes to the surface - explodes, if felsic. Case History: Mt.
More informationWhat factors affect the angle of a slope?
Climate Rock type and Structure What factors affect the angle of a slope? Aspect Fast mass movements Slides: Slides are movements along the SLIP PLANE, i.e. a line of weakness in the rock or soil structure.
More informationWhich map shows the stream drainage pattern that most likely formed on the surface of this volcano? A) B)
1. When snow cover on the land melts, the water will most likely become surface runoff if the land surface is A) frozen B) porous C) grass covered D) unconsolidated gravel Base your answers to questions
More informationLandslide lesson plan
Landslide lesson plan The landslide lesson plan provides teachers and students with an opportunity to investigate the elements that contribute to shaping landforms and the effects of landslides. ITEMS
More informationLecture 12: Slope Stability
Lecture 12: Slope Stability Key Questions 1. How do friction and cohesion work together to stabilize slopes? 2. What is trying to pull slope material down? 3. How does the slope angle play a role in slope
More informationDeep-Seated Landslides and Landslide Dams Characteristics Caused by Typhoon Talas at Kii Peninsula, Japan
Deep-Seated Landslides and Landslide Dams Characteristics Caused by Typhoon Talas at Kii Peninsula, Japan Hefryan Sukma KHARISMALATRI*,1, Hitomi KIKUCHI 1, Yoshiharu ISHIKAWA 1, Takashi GOMI 1, Katsushige
More informationOIKOS > landslide > mechanism >predisposing causes
predisposing causes and trigger OIKOS > landslide > mechanism >predisposing causes Landslides are events that occur in space and time. As such, it is usually possible to identify both one or more landslide
More informationGOAL 7 AREAS SUBJECT TO NATURAL DISASTERS AND HAZARDS. To protect life and property from natural disasters and hazards.
GOAL 7 AREAS SUBJECT TO NATURAL DISASTERS AND HAZARDS A. GOALS: To protect life and property from natural disasters and hazards. B. POLICIES: 1. Floodplains shall be maintained as natural drainage-ways.
More informationSCHUSTER SLOPE LANDSCAPE MANAGEMENT PLAN. January 15, 2015
SCHUSTER SLOPE LANDSCAPE MANAGEMENT PLAN January 15, 2015 1 WHY DO WE NEED A LANDSCAPE MANAGEMENT PLAN? 2 PROCESS FOR DEVELOPING THE SCHUSTER SLOPE LANDSCAPE MANAGEMENT PLAN 3 NORTH DOWNTOWN SUB AREA PLAN
More informationMass Movements and Hillslopes
Mass Movements and Hillslopes Erosion (or lack of) results from balance between internal resistance of materials & magnitude of external forces acting on them Evolution of landscapes depends largely on
More informationLecture 15: Subsidence
Lecture 15: Subsidence Key Questions 1. How does removal of groundwater cause subsidence on a regional scale? 2. Under what conditions does a building sink into sediment? 3. Why do clays consolidate more
More informationForces in Earth s Crust
Name Date Class Earthquakes Section Summary Forces in Earth s Crust Guide for Reading How does stress in the crust change Earth s surface? Where are faults usually found, and why do they form? What land
More informationENGINEERING EVALUATION OF THE STANLEY MINE ADVENTURE PARK AREA CLEAR CREEK COUNTY, COLORADO. Prepared for:
braun Braun Consulting Engineers ENGINEERING EVALUATION OF THE STANLEY MINE ADVENTURE PARK AREA CLEAR CREEK COUNTY, COLORADO Prepared for: STANLEY MINES ADENTURE PARK 3375 W. POWERS CIRCLE LITTLETON, COLORADO
More informationCHAPTER GEOLOGICALLY HAZARDOUS AREAS Applicability Regulations.
CHAPTER 19.07 GEOLOGICALLY HAZARDOUS AREAS 19.07.010 Applicability. Geologically hazardous areas may pose a threat to the health and safety of citizens when incompatible development is sited in areas of
More informationIntroduction: What is Mass Wasting? (1)
Mass Wasting Introduction: What is Mass Wasting? (1) Mass wasting is the downslope movement of regolith and masses of rock under the pull of gravity. Mass wasting is a basic part of the rock cycle. Weathering,
More informationEarth processes are dynamic actions that occur both on
29 Weathering, Erosion, and Deposition R EA D I N G Earth processes are dynamic actions that occur both on the earth s surface and inside the earth. Any process that breaks down earth material, such as
More informationLecture Outlines PowerPoint. Chapter 5 Earth Science 11e Tarbuck/Lutgens
Lecture Outlines PowerPoint Chapter 5 Earth Science 11e Tarbuck/Lutgens 2006 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors
More informationScience EOG Review: Landforms
Mathematician Science EOG Review: Landforms Vocabulary Definition Term canyon deep, large, V- shaped valley formed by a river over millions of years of erosion; sometimes called gorges (example: Linville
More informationProf. B V S Viswanadham, Department of Civil Engineering, IIT Bombay
19 Module 5: Lecture -1 on Stability of Slopes Contents Stability analysis of a slope and finding critical slip surface; Sudden Draw down condition, effective stress and total stress analysis; Seismic
More informationGLG101: What-To-Know List
Exam 3, Page 1 GLG101: What-To-Know List (Derived from Before You Leave This Page Lists) This list is intended to guide your reading and to help you prepare for the online multiple-choice quizzes. Each
More informationWhat do you need for a Marathon?
What do you need for a Marathon? Water and a snack? What about just a normal day? 1 flush = 3.5 gallons 1 flush = 3.5 gallons 10 minute shower = 20 gal 1 flush = 3.5 gallons 10 minute shower = 20 gal Jeans
More informationAugust 31, 2006 Embankment Failure Debris Flow at the Cascades Development Haywood County, North Carolina. Introduction. Findings
August 31, 2006 Embankment Failure Debris Flow at the Cascades Development Haywood County, North Carolina Introduction North Carolina Geological Survey (NCGS) staff members visited the site of the August
More informationVIDEO The 2011 Japanese Earthquake and Tsunami
VIDEO The 2011 Japanese Earthquake and Tsunami Why was it so large and devastating? Why so short a warning? Why did tsunami precautions fail? What happened elsewhere? The Loma Prieta Earthquake (1989)
More informationSurface Processes on the Earth. Rocks, Weathering, Erosion and Soil
Surface Processes on the Earth Rocks, Weathering, Erosion and Soil ROCKS AND ROCK CYCLE Rock types Three main types of rock Igneous Metamorphic Sedimentary Igneous Form when magma or lava cools and hardens
More informationINTRODUCTION. Climate
INTRODUCTION Climate Landslides are serious natural disasters in many parts of the world. Since the past 30 years, rainfall triggered landslides and debris flows had been one of the natural disasters of
More informationChapter 7 Mudflow Analysis
Chapter 7 Mudflow Analysis 7.0 Introduction This chapter provides information on the potential and magnitude of mud floods and mudflows that may develop in Aspen due to rainfall events, snowmelt, or rain
More informationENVIRONMENTAL GEOLOGY
ENVIRONMENTAL GEOLOGY GL 2001.6 This course introduces the concepts of environmental geology within an The course reviews material previously studied in first and second year m for resources, their development
More information