一、这次会议对于近期黄河中游水沙变化的原因,有些方面是比较清楚了,但还有一些问题有待于进一步研究探讨: 1.黄河中游河龙区间水沙来量自七十年代起趋于减小,这与黄委同志分析的人类活动影响在1970年以前不明显而1970年以后则开始增大的情况是符合的。但是对于八十年代以来水沙量进一步剧烈减少的原因分析得还不大清楚,因此尚需进一步研究。 First, the meeting for the recent Yellow River water and sediment changes in the reasons, some aspects are more clear, but there are still some issues to be further studied to explore: 1. The middle reaches of the Yellow River Delta area of ​​water and sediment since the seventies tend to This is in line with the fact that the impact of human activities analyzed by the Comrades of the Yellow River Committee in the 1970s was not obvious and that the situation started to increase after 1970. However, the analysis of the reasons for further drastic reduction in sediment yield and sediment volume since the 1980s is not yet clear and needs further study.