Dynamic process simulation model for soil erosion of small-scale watershed system

被引：0
作者：
Gao P. [1 ,2 ]
Lei T. [2 ,3 ]
机构：
[1] College of Resource and Environment Engineering, Shandong University of Technology
[2] State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Acad. of Sci.
[3] College of Hydraulic and Civil Engineering, China Agricultural University
来源：
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2010年 / 26卷 / 10期
关键词：
Dynamic simulation; FEM; Models; Numerical simulation; Soil conservation; Soil erosion model; Watersheds;
D O I：
10.3969/j.issn.1002-6819.2010.10.007
中图分类号：
学科分类号：
摘要：
Founding the prediction model of watershed soil erosion could provide basis for comprehensive management to a small watershed and make macro decision-making such as land use plans, at the same time it could provide reference for evaluating the effect of small watershed water and soil conservation. Through the analysis of the dynamic process of erosion and the reasonable coupling to space-time relationship between surface-channel and channels, a soil erosion dynamic simulation model of watershed system was established on the basis of continuous flow equation, conservation of momentum equation and mass conservation equation of sediment. Discrete numerical model of watershed system was established by using the FEM to discrete simulation model of soil erosion. VC + + computer simulation program to soil erosion was developed on the basis of determining discrete approach to space-time. In the laboratory artificial simulated rainfall conditions, the run-off flow, run-off sediment and the channel flow dynamics processes at the typical points were got by using this program to simulate soil erosion in model watershed at the case of 50 mm/h rain intensity and 5 min rainfall duration. Comparing simulation results and measuring results at channel outlet, the simulation accuracy of run-off flow, run-off sediment and flow were all more than 80%. The results showed that the soil erosion simulation model was reliable, the discrete numerical method and the preparation of the programs were all entirely feasible. The simulation method presented in this study can provide a basis and reference for simulation of watershed soil erosion.
引用
收藏
页码：45 / 50
页数：5
相关论文
共 24 条
  • [1] Tang L., Study on sediment yield model of basin, Advances in Water Science, 7, 1, pp. 47-53, (1996)
  • [2] Wang M., Zhang R., Study on sediment yield model of single rainstorm in Chabagou watershed, Northern Shaanxi, Journal of Soil and Water Conservation, 22, 2, pp. 11-18, (1990)
  • [3] Wang X., Sediment yield mathmatical model of loess zone watershed, Journal of Sediment Research, 3, pp. 55-60, (1987)
  • [4] pp. 3-225, (1998)
  • [5] Hu L., Li R., Yang Q., Region-scaled water erosion assessment based on GIS, Acta Pedologica Sinica, 38, 2, pp. 167-175, (2001)
  • [6] Ascough I.I., Baffaut J.C., The WEPP watershed model: I. Hydrology and erosion, Trans Am Soc Agric Eng, 40, 4, pp. 921-933, (1997)
  • [7] Cochrane T.A., Flanagan D.C., Assessing water erosion in small watersheds using WEPP with GIS and digital elevation models, Soil and Water Conserv, 54, 4, pp. 678-685, (1999)
  • [8] Flanagan D.C., Nearing M.A., Sediment particle sorting on hillslope profiles in the WEPP model, Trans Am Soc Agric Eng, 43, 3, pp. 573-583, (2000)
  • [9] Laflen J.M., Flanagan D.C., Engel B.A., Soil erosion and sediment yield prediction accuracy using WEPP, Journal of AWRA, 40, 2, pp. 289-297, (2004)
  • [10] Laflen J.M., Elliot W.J., WEPP-predicting water erosion using a process-based model, Soil and Water Conserv, 52, 2, pp. 96-102, (1997)
123