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大河、大江河口的水质因河道流程长而变得复杂,且受海水倒灌影响。本文着重阐述了河口区水质评价及盐水入侵二个课题的研究情况,介绍了在缺少长期累积资料情况下,运用现场实测、生物调查、航空遥感、数模分析、频谱分析等不同的技术和方法对同一课题研究分析,获得了可靠结论。并提出在河口利用滩涂建造避咸蓄淡水库方式开发淡水水源。研究成果已得到应用。位于长江潮汐河口的上海市已建造供水量为130万m~3/d 的水源工程,解决了上海市缺少合格的淡水资源问题。
The water quality of Dahe and Dajiang estuaries is complicated by the length of the river course and is affected by seawater intrusion. This article focuses on the study of water quality assessment and saltwater intrusion in the estuary area, and describes the use of different technologies and methods such as field surveys, biological surveys, aerial remote sensing, numerical analysis, and spectrum analysis in the absence of long-term cumulative data. Research and analysis on the same subject have obtained reliable conclusions. And proposed to use tidal flats in the estuary to build freshwater sources for avoiding salt and storing freshwater. Research results have been applied. Shanghai, which is located at the tidal estuary of the Yangtze River, has constructed a water supply project with a water supply of 1.3 million m3/d, which solved the problem of lack of qualified freshwater resources in Shanghai.