Specifications

1 Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission,
Zhengzhou 450003, China
2 Faculty of Water Resources and Hydraulic Power, Xi'an University of Technology, Xi'an
710048, China
3 Xifeng Soil and Water Conservation Experimental Station, Yellow River Conservancy
Commission, Qingyang 745000, China
Corresponding author: Ran, D. ([e-mail])
Source title: Nongye Gongcheng Xuebao/Transactions of the Chinese Society of
Agricultural Engineering
Abbreviated source title: Nongye Gongcheng Xuebao
Volume: 29
Issue: 12
Issue date: June 15, 2013
Publication year: 2013
Pages: 154-162
Language: Chinese
ISSN: 10026819
CODEN: NGOXEO
Document type: Journal article (JA)
Publisher: Chinese Society of Agricultural Engineering, Agricultural Exhibition Road
South, Beijing, 100026, China
Abstract: This paper analyzed the effect of warping dams of different configuration ratios on
reducing sediment and major factors contribution rate by mathematical statistics method and the
investigation data in Dali River basin in middle of Yellow River. The investigation data showed land
area of different type dams increased with time in Dali River basin, but presented obviously slow
increasing in the near future. Warping dams reduced mean flood amount with 18.4 million m3
and sediment 12.9 million t during 1960-2002 annually, and the ratio of different type dams was
80.1%, 14.6%, 5.3%, respectively. The period of biggest reduction of sediment with 30.2% was
1990 s, and the responding ratio of different type warping dams was 1.84:2.37:5.79.The sediment
decrement of large-scale soil-retaining dam was 5.5 times than that of medium dam, and was 15
times than that of small dams. The optimized proportion of distributions of warping dams for
achieving continuous sediment reduction in the future in drainage basin was 1:3.0:7.0. The
maximum amount of sediment reduction by different types of soil retaining dams correlated
closely with flood season rainfall and 1-day maximum rainfall. Within the sediment reduction
capability of warping dams, the amount of sediment reduction increased with rainfall intensity,
presenting the characteristics of "the more sediment reduction with the more incoming
sediment". Reducing sediment of the warping dams had a proportionality relationship with
observed flood in different periods. Since 1990s, sediment reduction was about 0.23 t/m3 of unit
cubic meter of flood discharge. Sediment reduction amount was about 0.19t/m3 per unit cubic
meter of flood discharge during 1970s and 1980s, and the amount was about 0.23 t/m3 since
1990s. The warping dams reduced sediment increased with the value of 3 major factors. The
contribution ratio of the factors was in the order: the flood amount &le rain season rainfall &le
1-day maximum rainfall.
Number of references: 26