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Simulated multi-scale watershed runoff and sediment production based on geowepp model

International Journal of Sediment Research 2009年第4期24卷 465-478页

作者： YU Xinxiao 1 , ZHANG Xiaoming 2 and NIU Lili 31 Prof. Dr., Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China, 2 Dr. China Institute of Water Resource and Hydropower Research, Beijing 100048, China 3 Dr., Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China Prof. Dr. Key Laboratory of Soil and Water Conservation and Desertification Combating Ministry of Education School of Soil and Water Conservation Beijing Forestry University Beijing 100083 China Dr. China Institute of Water Resource and Hydropower Research Beijing 100048 China Dr. Key Laboratory of Soil and Water Conservation and Desertification Combating Ministry of Education School of Soil and Water Conservation Beijing Forestry University Beijing 100083 China

The runoff and sediment yield data from the Qiaozidonggou, Qiaozixigou, and Lu’ergou watersheds, in the Loess Plateau of China are used to calibrate and validate the runoff and sediment yield simulated by geowepp model of the WEPP model at watershed scale. The indices of relative error, R, correlation coefficient, R 2 , and Nash-Suttcliffe efficiency coefficient En s are used to evaluate the model fit. The eco-hydrological responses in the Luoyugou and Lu’ergou watersheds are also forecast based on the WEPP model. Meanwhile, the relation between vegetation pattern changes and sediment yield in the watershed is discussed, and the responses of runoff and sediment yield in the watersheds concerning forest growth stages are studied. The results show that the relative errors of simulated values of runoff and sediment yield are below 30%, the correlation coefficients are above 0.90, and the Nash-Suttcliffe efficiency coefficients are above 0.80. The simulation results present satisfactory performance, thus, the model could be used to simulate the runoff and sediment yield in these small watersheds. It is also observed that soil erosion tended to become severe as precipitation increased in the watershed, while soil erosion has a decreasing trend as forest cover increases and vegetation pattern is optimized. When the watershed is fully covered by forest, erosion and sediment yield are minimized. When the forest cover is about 30% and evenly distributed in the watershed, the erosion intensity is lower than if the forest cover is collectively distributed in the watershed. Erosion varies with different forest growth stages in the watershed; it is more serious at the young and near planting stage and is the smallest at the mature forest stage.

关键词： geowepp model Eco-hydrological response Watershed runoff Sediment yield model calibration Erosion modeling

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黄土生态护坡优化措施研究及水土流失治理效果预测

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Journal of Geographical Sciences 2024年第6期34卷 1083-1108页

作者：张晓超李明俐姚忠劭覃亮蒙明辉 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Sichuan Geological Environment Survey and Research Center Chengdu 610084China Sichuan Huadi Building Engineering Co. Ltd.Chengdu 610084China Sichuan Province Engineering Technology Research Center of Geohazard Prevention Chengdu 610084China

The large-scale management of ditches and implementation of land projects in loess areas have increased the arable land area but have caused considerable engineering issues, resulting in severe soil erosion. In this study, field tests were performed at different time scales, a control group was established, organic material–plant joint restoration technology was proposed as an optimized management measure, and the erosion control mechanism and restoration mode of organic material–plant joint restoration technology were analyzed. Based on the obtained experimental data, a Water Erosion Prediction Project(WEPP)-based hydraulic erosion model was constructed, sensitivity parameters were calibrated, and the soil erosion intensity and corresponding spatial distribution in the watershed of the study area were simulated via the geo-spatial interface for WEPP(geowepp) after organic material–plant joint restoration technology was adopted to predict the effect of optimized management measures. The results showed that among the slopes with different restoration measures, organic material–plant joint restoration technology effectively controlled loess slope erosion, and the average erosion modulus of the organic material–grass and shrub transplantation slope reached only 23.37 t/km^(2), which is a decrease of 97.68% relative to the traditional grass–shrub protection slope. Moreover, the sand content of the joint restoration slope was reduced by 392.41 g/L relative to the bare slope, reaching only 0.29 g/L, and the runoff yield was reduced by 8.88 L/min. The geowepp modeling results revealed that the total runoff yield and average annual erosion modulus of the watershed were lower after joint restoration than during the prerestoration period. Similarly, the total runoff yield of the watershed was 4.6%, the simulated 10-year average annual total sand production reached 2048.3 t,and the average annual erosion modulus was 582.75 t/km^(2), which is 52.15% lower than that under untrea

关键词： loess excavation slope slope surface erosion prevention and control measures geowepp model erosion prediction

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