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过去确定黄河流域水土流失重点治理区主要采用来沙分配图法和多沙粗沙模数指标法,这两种万法都需用到粗泥沙资料,由于有泥沙颗分资料的测站较少,故其精度有限.根据河龙区间7～8月份水流平均含沙量300kg/m~3的指标,在含沙量分布图上确定出重点治理区,该万法只涉及全沙资料,而有全沙资料的站网控制密度相对比有粗泥沙资料的站网控制密度耍大得多,因此其精度也就高得多.黄河流域重点治理区为11.3万km~2,其中河龙区间为5.7万km~2,泾洛渭河为3.2万km~2,祖厉河、苦水河为2.4万km~2,河龙区间的5.7万km~2是重点中的重点.
In the past, the key areas for harnessing soil and water loss in the Yellow River Basin were mainly the sand distribution map method and the coarse sand sediment modulus index method, both of which require the use of coarse sediment data. Because sediment fraction data stations Less, so its accuracy is limited.According to the river dragon range from July to August the average flow rate of 300kg / m ~ 3 indicators, in the sediment distribution map to determine the key control area, the method only involves the whole sand information , While the control density of station network with all-sand data is much greater than the control density of station network with coarse sediment data, so the accuracy is also much higher. The key control area in the Yellow River Basin is 113000 km 2, of which The range of Heilong is 57,000 km ~ 2, that of Jingluo Weihe is 32,000 km ~ 2, that of Zuolihe and Shushuihe is 24,000 km ~ 2, and that of Hejian is 57,000 km ~ 2.