黄河下游河床演变中的地貌临界

从地貌学的角度，比较深入地研究了黄河下游河床演变中的几个临界问题纵剖 面调整的临界问题、河道平面形态的临界问题、河型对河床边界的临界响应问题以及河床断面形态的临界判别问题。并且以河型转化趋势预测为例，对地貌临界在河床演变中的应用作了进一步的探讨。结果表明，小浪底水库建成后，在其清水下泄期间，下游河型将不会发生改变。

Geomorphic Thesholds of the Channel Process in the Lower Yellow River

From the geomorphic perspective, this paper probes into a few thresholds of the channel process in the Lower Yellow River such as threshold of the vertical section adjustment, thresholds of channel plane morphology, complex response of channel patterns on the boundary of the channel and the threshold judgement of transect shape. Taking the changing tendency forecast of the channel patterns as an example, we have further discussed the application of geomorphic thresholds to the channel process in the Lower Yellow River. There is an indication that the channel patterns in the Lower Yellow River will not be changed utterly when Xiaolangdi Reservoir discharges its clean water after It will have been built.