黄河粗泥沙集中来源区输沙模数研究

Study on Sediment Transport Modulus of Coarse Sand Centralized Source Area in the Yellow River

黄河粗泥沙集中来源区输沙模数是淤地坝拦沙库容规模设计最重要的参数。受人类活动影响,1970—2007年实测多年平均输沙模数明显偏小,必须对其还原修正后方可应用于工程设计。采用长短系列对比分析法分析黄河粗泥沙集中来源区各水文站长系列(1954—2007年)实测多年平均输沙模数较短系列(1954—1969年)变化情况,并对长系列输沙模数进行还原,得出还原后黄河粗泥沙集中来源区多年平均年输沙总量和年输沙模数分别为3.19亿t、1.7万t/(km2.a),介于短系列和长系列实测值之间,多年平均年还原量为0.64亿t。

The sediment transport modulus of coarse sand centralized source area in the Yellow River is the most important parameter for warping dam sediment storage capacity design.Due to the influence of human activities,the measured multi-year average sediment transport modulus from 1970 to 2007 is obviously smaller;hence,it is necessary to restore and modify the modulus before applying to engineering design.Length of series of comparative analysis method was adopted to analyze the changes of multi-year average sediment transport modulus of short-term（1954-1969） and long-term（1970-2007） series at the hydrological stations in the coarse sand centralized source area of the Yellow River.After modifying the sediment transport modulus of the long-term series,the multi-year average annual sediment yield and annual sediment transport modulus are 319 million tons and 17,000 t/（km2·a）respectively,which is between the measured values of the short-term and long-term series,and the multi-year average annual restoration amount is 64 million tones.