On-going program of the State-Funded Landslide Project (SFLP): Updating a medium-scale landslide database for high-risk areas using community surveys in Vietnam Coordinated by: Le Quoc Hung, Pham Van Son, Nguyen Thi Hai Van et al. Add: 67 Chien Thang Street, Ha Dong District, Hanoi City, Vietnam Phone : (++84) 4 3854 4386 Fax: (++84) 4 3854 2125 Email: vigmr@vigmr.vn Website: http://www.vigmr.vn 1
CONTENTS I. Introduction - Master Project (SFLP) II. Aims and main tasks of on-going project III. Pilot surveys and initial results IV. Challenges
I. INTRODUCTION State-Funded Lanslide Project (SFLP) Full title: Investigation, assessment and warning zonation for landslides in the mountainous regions of Vietnam Carrying out by: ~500 staffs of 15 organizations in Vietnam) Leading agency : Vietnam Institute of Geosciences and Mineral Resources (VIGMR) Implemented in mountainous areas 75% area of the country mainland 37/63 provinces Goals: Establishment of a standard national database on landslides and generation of landslide hazard maps at 1:50,000 for 37 mountainous provinces of Vietnam, and at 1:10,000 for hotspot areas Design of an Early Warning System for landslides, and implementing that in a number of test areas
SFLP: Main outputs 1. A national database and WebGIS on landslides and related factors; 2. Landslide warning zonation maps at 1:50,000 scales for 37 mountainous provinces, and at 1:10,000 scales for hotspots areas: Landslide inventory maps Landslide susceptibility maps Landslide hazard maps Landslide risk maps 3. A pilot network of landslide monitoring stations 4. Reports and guidelines to end-users for: Using the result maps, WebGIS and database Recommendation of landslide mitigation measures; Dissemination and communication of landslide preparedness, prevention and mitigation; Proposed network of landslide monitoring and early warning for very high landslide hazard areas.
SFLP: Workflow A: Data collection and factor mapping B: Susceptibility and hazard assessment C: Vulnerability assessment D: Risk assessment (adapted from Castellanos Abella, E.A., de Jong, S.M., Van Westen, C.J. and van Asch, W.J., 2008. Multi-scale landslide risk assessment in Cuba. ITC, University of Utrecht. ITC Dissertation 154, 272 p. ISBN: 978-90-6164-268- 8)
SFLP: Results so far Results maps at 1:50,000 scale: Nr. Provinces Inventory Maps Susceptibility Maps Hazard, Vunerability and Risk Maps 1 Lai Chau 2013 2016-2 Dien Bien 2013 2016-3 Son La 2013 2016-2017 - 4 Lao Cai 2013 2014-5 Yen Bai 2013 2014-6 Ha Giang 2013 2017-7 Tuyen Quang 2013 2018-8 Cao Bang 2014 2017-9 Bac Kan 2013 2017-10 Bac Giang 2014 2018-11 Quang Ninh 2014 2018-12 Hoa Binh 2014 2018-13 Thanh Hoa 2012 2014-14 Nghe An 2012 2014-15 Lang Son 2016 2018-16 Ha Tinh 2017 - - 17 Quang Binh 2017 - - 18 Quang Tri 2018 - - 19-37 19 other provinces - - -
PROJECT RESULT SO FAR (10/2012-12/2015) Landslide inventory maps at 1:50,000 scales for 17 Northern mountainous provinces that are compiled for publication
PROJECT RESULT SO FAR (10/2012-12/2017) Landslide susceptibility maps at 1:50,000 scales for 10 Northern mountainous provinces: Nghe An, Thanh Hoa, Lao Cai, Yen Bai, Lai Chau, Dien Bien, Son La, Ha Giang, Cao Bang, Bac Kan
SFLP: Urgent needs 1. Those maps were not regularly to be updated the environmental factors have kept changing landslides have still occurred previously-produced maps much different from present situation 2. For many high-risk areas, the authorities demand the risk maps at larger scales very difficult to construct due to the lack of necessary input data. 3. It is required to implement a program to update the landslide database for selected high-risk areas.
Nậm Mười after 21/7/2018 (200mm in 3 days) 3/1/2016
Nậm Mười after 21/7/2018 (200mm in 3 days) 3/1/2016
II. ONGOING PROJECT Full title: Updating a medium-scale landslide database for high-risk areas using community surveys in Vietnam Study areas: Selected 220 high risk communes in 10 Northern mountainous provinces (20,000 km 2 ) Goals: Investigating and updating the landslide database for the 220 selected highrisk communes in landslide-prone areas in Northern mountainous provinces using community surveys Mapping the landslide risk areas at 1: 10,000 scale and disseminating the result maps to the local authorities and people with community guidance
II. ONGOING PROJECT Deliverables An up-to-date spatial landslide database for high-risk communes; A set of landslide inventory, susceptibility and risk maps at 1:10.000 scale; Guidelines for dissemination and communication of landslide preparedness, prevention and mitigation for local authorities and people
II. ONGOING PROJECT Main approaches Community surveys Geological surveys Image interpretation
COMMUNIIY AND GEOLOGICAL SURVEYS Field note... Soil description sheet Field work... Landslide description sheet GIS and Mapping Landslide inventory Database
IMAGE INTERPRETATION
III. PILOT SURVEYS in 2017 20 high risk communes (835 km 2 ) of 4 landslide-pronce provinces
III. PILOT SURVEYS in 2017
III. INITIAL RESULTS: Updated database inventory mapping Xã Previous database Updated Updated unstable database slopes Interviews Nặm Lịch Xuân Lao Huổi Só Sính Phình Lầu Thí Ngài Bản Cái Nậm Mòn Bản Xèo A Mú Sung Phìn Ngan Đản Ván Pờ Ly Ngài Chiến Phố Pà Vầy Sủ Chế Là Phình Hồ La Pán Tẩn An Lương Đại Sơn Viễn Sơn TỔNG 8 37 14 25 1 25 8 38 0 40 21 9 20 101 48 29 8 43 6 13 2 9 13 11 3 31 16 17 7 51 21 9 10 63 11 5 10 77 22 5 1 32 32 12 1 50 22 17 15 131 60 9 0 59 15 7 2 31 23 26 5 48 11 9 15 114 29 13 7 18 17 17 24 57 18 33 13 47 19 36 152 1064 426 340
III. INITIAL RESULTS: Updated database: susceptibility mapping TT Communes Area (km2) Very high (km2) High Moderate (km2) (km2) Low Very low (km2) Very high (%) High (%) Moderate (%) Low (%) Very low (%) 1 Nặm Lịch 36 5.20 15.81 14.79 0.88 0.17 14.11 42.92 40.14 2.38 0.45 2 Xuân Lao 59.7955 8.21 28.85 19.82 1.48 1.39 22.29 78.31 53.78 4.03 3.78 3 Huổi Só 62.1712 6.09 12.23 30.19 10.52 4.32 16.54 33.20 81.93 28.55 11.74 4 Sính Phình 70.0634 20.85 20.10 23.82 5.22 0.33 56.58 54.56 64.64 14.17 0.88 5 Lầu Thí Ngài 16.9 4.58 4.06 5.59 2.32 0.32 12.44 11.01 15.16 6.29 0.86 6 Bản Cái 31 4.61 19.43 7.79 0.07 12.50 52.74 21.13 0.18 7 Nậm Mòn 35 6.96 14.70 8.38 4.63 0.19 18.89 39.90 22.73 12.55 0.50 8 Bản Xèo 26.5288 7.97 6.98 7.71 3.90 21.64 18.93 20.94 10.58 9 A Mú Sung 57 14.80 26.18 13.67 1.80 0.11 40.16 71.06 37.10 4.89 0.31 10 Phìn Ngan 66 30.63 23.25 6.97 4.18 0.88 83.14 63.09 18.92 11.35 2.39 11 Đản Ván 17 6.37 8.33 2.53 17.29 22.62 6.87 12 Pờ Ly Ngài 21.6223 7.54 8.79 4.82 20.48 23.85 13.09 13 Chiến Phố 30.31 18.83 9.20 2.28 51.11 24.96 6.19 14 Pà Vầy Sủ 25.55 9.84 13.82 1.47 0.08 26.70 37.50 3.98 0.21 15 Chế Là 26.34 6.07 15.00 5.04 0.23 16.47 40.70 13.67 0.62 16 Phình Hồ 31 6.30 12.66 11.64 17.09 34.35 31.59 17 La Pán Tẩn 33.2726 15.63 11.03 6.33 42.43 29.93 17.19 18 An Lương 68.51 6.50 16.17 42.52 1.45 1.45 17.63 43.88 115.41 3.93 3.94 19 Đại Sơn 81.15 6.55 28.82 41.55 3.96 3.07 17.78 78.22 112.77 10.75 8.34 20 Viễn Sơn 42.5116 7.21 12.72 20.92 1.18 0.25 19.56 34.53 56.79 3.21 0.69 TỔNG 837.7254 200.74 308.13 277.82 41.90 12.48 544.82 836.27 754.01 113.71 33.88
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
III. INITIAL RESULTS Inventory and susceptibility maps at 1:10.000 scale
IV. CHALLENGES AND NEXT PLANS Updating the landslide database to propose the areas for temporal evacuation and for permament relocation Collaboration with local government for: Community education using Project resutls and deliverables; Updating landslide inventory database from communities through email, WebGIS, facebook, SMS, etc.); Setup of a pilot landslide monitoring system. Collaboration with international experts for improve the survey technologies
Looking forwards to hearing your comments to improve our work!