Distribution, failure risk and reinforcement necessity of check-dams on the Loess Plateau: a review Distribution, failure risk and reinforcement necessity of check-dams on the Loess Plateau: a review

最小化 最大化

Vol18 No.2: 499-509

Title】Distribution, failure risk and reinforcement necessity of check-dams on the Loess Plateau: a review

Author】GUO Wen-zhao1, 2, 3;. XU Qiang2 *; HU Jian-jun4; ZHU Li-li4

Addresses】1 State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Water and Soil Conservation, Northwest A&F University, Yangling 712100 , China; 2 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 3 Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu 610059, China; 4 Xi'an Planning, Design & Research Institute, Upper and middle Yellow River Bureau, Yellow River Conservancy Commission, Ministry of Water Resources, Xi'an 710021, China

Corresponding author】XU Qiang

Citation】Guo WZ, Wang WL, Xu Q, et al. (2021) Distribution, failure risk and reinforcement necessity of check-dams on the Loess Plateau: a review. Journal of Mountain Science. Journal of Mountain Science 18(2). https://doi.org/10.1007/s11629-020-6090-7

DOI】https://doi.org/10.1007/s11629-020-6090-7

Abstract】Check-dams are the most important measure to control the soil and water loss in highly erodible catchments on the Chinese Loess Plateau. Based on the data of check-dams from 1950 to 2014,our studyroundly analyzed theregional distribution,function and the problems of check-dams on the Loess Plateau. A total of 17,094 check-dams with a storage capacity of over 100,000 m3 and an average density of 0.027 counts km−2 were installed on the Loess Plateau. Check-dams' densities varied greatly in the Qinghai Province, Gansu Province, Ningxia Hui Autonomous Region, Inner Mongolia Autonomous Region, Shaanxi Province, Shanxi Province and Henan Province. The highest density of check-dams reached 0.088 counts km−2 in Shaanxi Province, whereas the lowest density of check-dams was only 0.005 counts km−2 in Qinghai Province.However, after decades of operation, 3025 large check-dams and 2257 medium check dams are dangerous and have security risks, whichare seriously threatening downstream safety. The dangerous rate of check-dams is high.Specifically, the check-dams in Shanxi and QinghaiProvincehave the highest dangerous rates, with both exceeding 53%.Therefore, there is an urgent need for carrying out reinforcement of the dangerous check-dams.The results are helpful to policymakers toextend and develop check-dams.

Keywords】Check-dam; Soil erosion;Sediment; Gully; Dam failure; Chinese Loess Plateau