Changes in runoff and sediment transport in the Middle Reach of the Huai River have been studied by using 58 years of field data. The runoff yield from the Huai River watershed mainly occurs in the sub-watershed of the river. At the downstream Wujiadu station, the difference in total drainage area between the south and the north branches of the river is 43% while the difference in runoff yield is only 9%. Sediment yield mainly comes from the headwaters in the northern region with the upstream of the Huai River playing a secondary role. The data demonstrate that there has been little change in long-term average annual runoff in the Middle Reach of the Huai River (MRHR) but there has been a dramatic decrease in average annual sediment transport. This decrease in sediment transport in the Huai River has resulted in changes in the geomorphology of the Middle Reach of the Huai River with time. Further analysis indicates that both the main channel and the floodplain of the estuary of Hongzehu Lake have a tendency towards the deposition of sediment. A trend and regression analysis is used in the compilation of field data, calculations, and analysis.

中文翻译：

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淮河径流泥沙运移变化——案例研究

利用58年的野外资料研究了淮河中游地区径流和泥沙输移的变化。淮河流域的产水量主要发生在河流子流域。在下游吴家渡站，南、北支流总流域面积相差43%，产水量相差仅9%。产沙主要来自北部地区的源头，淮河上游次之。资料表明，淮河中游地区长期年均径流量变化不大，但年均输沙量却急剧下降。淮河泥沙输运的减少导致淮河中游地貌随时间的变化。进一步分析表明，洪泽湖河口的主河道和漫滩均有泥沙沉积的趋势。趋势和回归分析用于现场数据的汇编、计算和分析。