中文摘要：

本文对“关于三峡工程对城陵矶防洪能力影响有关研究的讨论”一文进行回应和讨论。文中首先分析了城汉河段在一段时期淤积的机理，同时指出从近50年来该段并不是如文献[1]所说的只淤不冲，而是也发生了冲刷，其中1992年至1998年就冲刷0．868×10^8m^3。冲刷的原因就是因为宜昌水文站年来沙减少了1×10^8t。更雄辩的事实是，在三峡水库蓄水后该段也发生了冲刷，这些说明文献[1]断言，三峡建成后在100年内城汉河段都处于淤积状态是完全不符合实际的。其次，指出文献[1]采用的分析方法在理论上根据不足，而且无法证明城汉河段长期淤积。本文接着从非均匀沙挟沙能力的理论，通过水量百分数调整、粗细泥沙交换、以及挟沙能力负荷等多方面论证了城汉河段在三峡水库蓄水后即会发生冲刷。而汉口以下在一些年以后也会发生冲刷，从而推翻了文献[1]的结论。最后本文在上述讨论的基础上质疑了文献[1]认为三峡建库对城陵矶防洪不利的观点。

英文摘要：

This paper is the River after the impoundment response on the ref. （ 1 ）“Discussion on the flood control capacity of the middle Yangtze of Three Gorges Reservoir”.Firstly, the mechanism of sedimentation of the Chen-Han reach（The fiver reach from Chenglingji, the outlet of Dongting Lake, to Wuhan city）is revealed by the author. According to the facts, such as the scouring amount 0.868×10^8s m^3 because of the reduced incoming sedimnent 1×10^8t at Yichang before TGR being in operation, and scouring after the impounding of TGR, the viewpoint of ref. （1） is not true that the reach is always deposited without scouring over last fifty years and will be continuously deposited in one hundred years after impounding of TGR. Since the method adopted in ref. （ 1） is not reasonable, and thus the long term deposition in the reach can not be proved in such a way. Based on the theory of carrying capacity of nonuniform sediment, by using the regulation of percentage of flow discharge and the exchange between coarse and fine particles and the varying of carrying capacity, it is demonstrated that scouring at Luoshan will occur as soon as TGR is in operation even at Wuhan twenty years later. In fact, the river reach of Chenglingji-Wuhan is continuously eroded in last two years after impounding of TGR. The conclusion of this paper totally contradicts the statement of ref. （ 1 ）.