[1]RAN Dachuan,QI Bin,XIAO Peiqing,et al.Response of Extraordinary Rainstorm and Flood to the Harnessing for Underlying Surface in Jialu River Basin[J].Research of Soil and Water Conservation,2015,22(06):7-13.
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Response of Extraordinary Rainstorm and Flood to the Harnessing for Underlying Surface in Jialu River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 06
Page number:
7-13
Column:
Public date:
2015-12-28
- Title:
- Response of Extraordinary Rainstorm and Flood to the Harnessing for Underlying Surface in Jialu River Basin
- Keywords:
- rainstorm; flood; harnessing for underlying surface; sediment reduction; Jialu River Basin
- CLC:
- S157
- DOI:
- -
- Abstract:
- According to the measured hydrological data and the field survey, the factors analysis of ‘2012-7-27’ rainstorm and flood in Jialu River Basin was done based on the harnessing of underlying surface. The relationship of the flood and sediment and the relationship of the rainfall and the runoff in the flood season and its changes of the watershed were analyzed using regression analysis. The flood and sediment reduction of the soil and water conservation measures was calculated using the index method. The ability of soil and water conservation measures on reducing the sediment and the reduction effect of vegetation measures on the flood and sediment of the watershed were analyzed. The results showed that: (1) ‘2012-7-27’ rainstorm rainfall, rainfall intensity and the coverage area were great, but the peak flow, maximum sediment concentration, the amount of flood and flood sediment load significantly reduced; the relationship of the rainfall and runoff of basin had obvious regional features, three zones of rainstorm areas, heavy rain areas and normal rainfall areas were divided corresponding to the average region rainfall related to the flood; (2) the effect of the soil and water conservation measures on reducing the flood and sediment was very obvious, the reduction effect of the soil and water conservation measures on the flood and sediment reached 26.8% and 38.3%, respectively, during ‘2012-7-27’ rainstorm. The reduction effect of the dam on the flood and sediment had the largest ratios, reached 71.0% and 51.9%, respectively. The reduction ratio of forest, grass and other vegetation measures (including closing hillside for afforestation) was the second; the reduction ration of the terrace was the third; (3) the flood and sediment reduction of vegetation measures was significant. The terrace and forest did not reach their maximum capacity of sediment reduction, which have the capability to resisting heavy rain floods. The sediment reduction of grass is about 1.8 times of the maximum capacity of sediment reduction, therefore, the vegetation measures need to be increased. Meanwhile, the key projects of controlling gully in the watershed should increase; the ‘terrace on the slope’ project should be carried out widely.
- References:
-
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Last Update:
1900-01-01