汇流区水沙组合对渭河下游河道冲淤演变影响

在对汇流区洪水来源及出现机率分析和对黄、渭、洛河不利水沙组合进行归类的基础上,对汇流区水沙组合影响渭河下游河道冲淤变化进行了分析研究。结果表明汇流区水沙组合对渭河下游冲淤演变有重要影响,当汇流区水沙组合有利时,渭河下游的局部侵蚀基准面潼关高程明显下降,渭河口流路顺直,出流顺畅,溯源淤积将大为减弱;反之,当汇流区水沙组合不利时,渭河下游的局部侵蚀基准面潼关高程显著上升,渭河口出流不畅,流路阻塞,溯源淤积迅速向上发展。最后根据分析结果提出了改变不利水沙组合的对策。

Influence on Erosion and Deposition in Lower Reaches of Weihe River under Different Condition of Water and Sand Combination in Conflux Area

Based on statistic of the reason and probability of flood and classifying different water and sand combination condition, the paper analyzes the influence on erosion and deposition equilibrium in lower reaches of Weihe River under the different condition of water and sand combination in conflux area. The result shows that the combination has very important role to the erosion and deposition in lower reaches of Weihe River. If the combination is suitable, the altitude in Tongguan will be descended quickly, which is the key point of eroding in lower reaches of Weihe river, and the deposition will be slowed down visibly. While on the contrary, if the combination is unsuitable, the altitude in Tongguan will be ascended clearly, and the deposition will be rapidly traced to the source. At the end of the paper, a countermeasure is put forward to deal with the problem.