Avoiding Geohazards in the Mid-Atlantic Highlands by Using Natural Stream Principles
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1 Avoiding Geohazards in the Mid-Atlantic Highlands by Using Natural Stream Principles J. Steven Kite, WVU Neal Carte, WVDOT Will Harman, Michael Baker Corp. Donald D. Gray, WVU Photo: W. Gillespie North Fork South Branch Potomac River, Hopeville, WV
2 1 Rosgen, D. L. 1996, Applied River Morphology, Wildland Hydrology, Pagosa Springs, Co. Natural Stream Principles? Fluvial Geomorphology Applied with Goal of Maintaining River & Stream Channels & Floodplains in Equilibrium. Developed from Relatively Unimpaired Streams Packaged by Dave Rosgen. 1 Must Be Fine Tuned to Region s flood meteorology, topography, geology, ecology, land-use, politics, & culture.
3 Why Use Natural Stream Principles in Engineering & Construction? 1. Aesthetics 2. Ecosystem Support 3. Long-Term Cost Effectiveness 4. Reduce Flood Hazard In Face of Increasing Flood Severity Image from Will Harman, Michael Baker Corp.
4 Floodplain = Part of River Floodplain: Low Energy We should not be surprised when, sooner or later, the River exerts its authority over its whole domain. Channel: High Energy Photo: J.S. Kite Mill Creek, Canaan Valley, W. Va
5 What is the Work of a Stream? 1. Water Delivery Little Conemaugh River, Johnstown, PA Photo: J.S. Kite
6 Work of a Stream? Todd Petty Photo Todd Petty Photo 2. Framework for Ecosystem Structure Constructed Floodplain Mitchell River Basin, NC Michael Baker Corp
7 Work of a Stream? 3. Sediment Transport Ignore Sediment Transport: Other Systems Do Not Work Photo: J.S. Kite
8 Grade Delicate Balance between sediment supply & system s ability to transport sediment Ω stream power sediment resistance J.S. Kite
9 Wolman-Miller Dominant Flow Hypothesis Frequency Event Sediment Transport Cumulative Sediment Transport Entrainment Threshold Dominant Flow (1-3 Year) Graphic: S. Kite, WVU Recurrence Interval (Years)
10 Graphics: J.S. Kite, J.S. WVU Kite Bank-Full = Dominant Flow Controlling Hydraulic Geometry Overbank Silt Loam Sand & Gravel Channel Deposits Bank-Full Stage Bedload Bedrock
11 Road Crossings Conventional Culverts May Be Migration Barriers & Block Sediment Transport Photo: J.S. Kite
12 Graphics: J.S. Kite, J.S. WVU Kite Culvert Area - Bankfull Channel Area Ratio Addresses Culvert s Ability to Pass Floods D Culvert Area - Bankfull Channel Area Ratio = Area Culvert / Area Bankfull Channel
13 Channel Area vs. Culvert Area: Non-aggrading and Aggrading Reaches Culvert Area No Aggradation Reaches Aggradation Reaches Linear (1:1 Ratio) Shavers Fork, W.Va. Approx. Channel Area White, J.A., 2004, MS
14 Photo: J.S. Kite Arch Culvert
15 Lower Culvert Allows Bank-Full Flow, Sediment Transport, Fish Migration Constructed Floodplain Image from Will Harman, Michael Baker Corp. Higher Culverts for Flood Passage
16 Prefab Concrete Box Culverts Bridge Constructed Floodplain Constructed Channel Constructed Floodplain Image from Will Harman, Michael Baker Corp.
17 Bank Erosion Hazard Mitchell River Basin, NC Michael Baker Corp. Photo Devotion Road (Rt. 1330)
18 Natural Stream Design May Rely on Structures (e.g. Cross Veins) Flow Directed to Mid-Channel to Reduce Bank Shear Stress Photo: J.S. Kite Constructed Reach WVU Stream Design Workshop, Mitchell River Basin, NC
19 Constructed Channel Reach WVU Stream Design Workshop, Mitchell River Basin, North Carolina J.S. Kite, WVU Good Design Must Address Dominant (1-3 Year) Flow, Not Just Big ( Year) Floods Bank-Full Flood = Dominant Flow
20 Mitchell River at Devotion Road (Rt. 1330), End of Construction Floodway for Extreme (e.g. 50 year) Floods Channel for Dominant (e.g. 1-3 year) Floods Photo by Will Harman Michael Baker Corp. Color Overlay: J.S. Kite
21 Common Flood Mitigation Error Over-Widening of Channel Overbank Silt Loam Sand & Gravel Channel Deposits Bank-Full Stage Bedload Bedrock Graphics: J.S. Kite, WVU
22 Common Flood Mitigation Error Over-Widening of Channel Old Bank-Full Stage Old Bank-Full Flow Can t Fill Banks & Can t Transport Sediment Bedrock Ω sediment Graphics: J.S. Kite, WVU
23 Common Flood Mitigation Error Over-Widening of Channel Old Bank-Full Discharge Becomes a Flood Old Bank-Full Stage Old Bank-Full Flow Can t Fill Banks & Can t Transport Sediment Bedrock Graphics: J.S. Kite, WVU
24 Common Flood Mitigation Error Over-Widening of Channel Old Flood Becomes a Worse Flood Old Bank-Full Stage Old Bank-Full Flow Can t Fill Banks & Can t Transport Sediment Bedrock No Matter What the Mayor Says! Don t Over-Widen Channels after a Flood. Re-Construct Bank-Full Channel Dimensions for Sediment Transport J.S. Kite, WVU
25 Base Level & Profile Equilibrium Base Level = Lowest elevation to which a stream can erode (e.g. Sea Level, Lake, Falls, Downstream Reach, etc.) Image Source:
26 Graphics: J.S. Kite, WVU Stream Adjustments to Lower Base Level Equilibrium - Concave Profile Lake Bedrock Outcrop
27 Graphics: J.S. Kite, WVU Stream Adjustments to Lower Base Level Incision to Adjust Profile Retreating Knickpoint
28 Lewis Run, Rockingham County, VA Large Gravel Pit Operations Lowered Channel Causing Retreating Knickpoint 1987 Topo Map: TerraServer-USGS Graphics: J.S. Kite, WVU
29 Lewis Creek, Rockingham Co., Va., 10 Nov 1985 Photo: J.S. Kite
30 Key to Reducing Flood Damage: Bank Stability Anthony Creek, Greenbrier Co., W.Va. Photo: J.S. Kite
31 USGS Photo Graphics: J.S. Kite, WVU W.Va. Rt. 28/55, Near Champe Rocks: Before 1985 Flood
32 WV DOT Photo Graphics: J.S. Kite, WVU W.Va. Rt. 28/55, Near Champe Rocks: After 1985 Flood
33 USGS Photo Graphics: J.S. Kite, WVU W.Va. Rt. 28/55, Near Champe Rocks: Before 1985 Flood Old Channels
34 Vegetation = Nature s Bank Protection Image from Will Harman, Michael Baker Corp.
35 Photo by Will Harman, Michael Baker Corp.
36 Dense Root Wads Reduce Bank Shear Mitchell River Basin Photo: J.S. Kite
37 Hydraulic Geometry in Plan View Sinuosity = P = River Distance Along Thalweg / Straight-Line Distance Sinuosity Rosgen Class Low Moderate High Radius of Curvature Meander- Belt Width Graphics: J.S. Kite, WVU λ = Meander Wavelength
38 North Fork South Branch Potomac River, Hopeville: Before USGS Photo
39 North Fork South Branch Potomac River, Hopeville Anticline Photo: J.S. Kite
40 North Fork South Branch Potomac River, Hopeville: After WV DOT Photo
41 WV DOT Photo Graphics: J.S. Kite, WVU North Fork South Branch Potomac River, Hopeville: After
42 R c = 250 m (800 ft) R c = 310 m (1020 ft) R c = 330 m (1080 ft) Graphics: J.S. Kite, WVU North Fork South Branch Potomac River, Hopeville, WV, 1987
43 R c = 290 m (950 ft) R c = 310 m (1020 ft) R c = 310 m (1020 ft) Photo: TerraServer-USGS Graphics: J.S. Kite, WVU North Fork South Branch Potomac River, Hopeville, WV, 1987
44 7 Upstream Meanders Mean R c = 302 m R c = 135 m (440 ft) R c = 315 m (1030 ft) North Fork South Branch Potomac River, Hopeville, WV, 1987 After Flood Mitigation Photo: TerraServer-USGS Graphics: J.S. Kite, WVU
45 7 Upstream Meanders Mean R c = 302 m R c =302 m (990 ft) R c = 315 m (1030 ft) North Fork South Branch Potomac River, Hopeville, WV, 1987 After Flood Mitigation Graphics: J.S. Kite, WVU
46 North Fork South Branch Potomac River, Hopeville Flood R c = ~400 m (~1300 ft) When Rules of the River are not respected, adverse channel adjustments often result. Photo: W. Gillespie (Luna Leopold, 1994) Graphics: J.S. Kite
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