黄河中游多沙粗沙区高含沙水流的粒度组成及其地貌学意义

通过野外实测资料的分析，发现在黄土高原的高含沙水流中，存在着某种最优的悬移质泥沙粒度组成，使得含沙量达到最大。这一最优粒度组成的出现，与流域中黄土、风成沙和基岩这三种物源的特定搭配有关，也是风力－水力交替区特有的外营力作用的结果。与悬移质泥沙的最优粒度组成相对应，出现了黄河中游多沙粗沙区产沙模数最大值。

Optimal Grain Size Composition of Hyperconcentrated Flows in High intensity Coarse Sediment Producing Area of the Middle Yellow River Basin and Its Implications in Geomorphology

It has been found in this study that there exists some optimal suspended sediment grain size composition for the hyperconcentrated flows on the loess plateau, which makes the suspended sediment concentration the highest. The occurrence of this optimal suspended sediment grain size composition may be related to the specific combinations of the 3 major surface material types (i.e., loess, eolian sand and weathered materials from bedrocks) in this area, and also to the wind water alternative processes. Responding to the optimal suspended sediment grain size, the highest values of specific sediment yield has been found to occur in the high intensity coarse sediment producing area in the middle Yellow River basin.