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| Scenario simulation of runoff and sediment processes in the small catchment in the Hilly-gully region of Loess Plateau |
| Yang Tao1,Chen Jieren1,Zhou Yi2,Yao Wenyi3,Chen Xi1,Shi Xuejian3,Xu Yi1,Huang Guoru4 |
| 1.State Key Lab.of Hydrology and Water Resources and Hydraulic Engineering,Hohai University,210098,Nanjing;2.Jiangsu Provincial Bureau of Hydrology and Water Resources,210029,Nanjing;3.The Institute of Hydraulic Engineering of Yellow River,450003,Zhengzhou;4.College of Civil Engineering,South China University of Science and Engineering,510641,Guangzhou |
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Abstract Based on the runoff and sediment yield mathmatical model for the Chabagou catchment in Hilly-gully region,a typical small catchment in the middle stream of Yellow River,was selected to simulate the runoff and sediment yield under several various possible situations.Firstly three designing precipitation schemes with the occurring period of 100,50 and 10 years respectively were computed and used in runoff and sediment yield simulation.Then three vegetation cover schemes were used in the scenario simulation.Results indicate: 1) The flood and sediment transport peak for the designing-strom event with 100-year period(P=0.01) is 805 m3/s and 775×103 kg/s,it is 595 m3/s,502×103 kg/s for those of 50-year period(P=0.02) and 108 m3/s,121×103 kg/s for those of 10-year period(P=0.1),It can be inferred that the occurring period of 19890701 storm event is between 100 and 50 years according to the simulation results;2) The positive impacts of vegetation coverage on reduction of water yield and soil erosion of catchment are detected,in which,reduction of 73% and 84% for water yield and sediment yield with 25% decreasing of vegetation coverage are identified,whilst,the simulated water and sediment yield will increase by 29.9% and 18.6% if the study catchment suffers 25% decreasing of vegetation coverage.The results of this investigation will be greatly benificial to regional,soil and water conservation planning and designing in Hilly-gully region.
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Received: 03 March 2007
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