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海（咸）水入侵作为莱州湾南岸平原的一种新的环境灾害，其发生、发展与该区广泛分布的古河道密切相关。本文研究了古河道的分布规律、沉积特征及分期，并重点探讨了其与海（咸）水入侵的密切关系．古河道是该区海（咸）水入侵的主要通道，古河道中海（咸）水入侵速度快、方式多、周期性变化明显，是灾情最严重、入侵变化最复杂的地貌单元；古河道又是防治海（咸）水入侵的天然工程，古河道砂层径流条件好，只要采取措施提高其地下淡水水位，海（咸）水入侵界线就能迅速北退。
Sea (salty) water intrusion as a new environmental disaster on the southern bank of Laizhou Bay is closely related to the widespread distribution of ancient rivers in the area. In this paper, we study the distribution, depositional characteristics and staging of ancient river courses, and focus on the close relationship between them and sea (salty) water intrusion. The ancient river course is the main channel for the sea and salt water intrusion in this area. The invasion of the sea water in the ancient river course is fast, with many kinds of changes and obvious cyclical changes. It is the most complicated geological transformation unit in the disaster area. It is a natural project to prevent the invasion of sea (salty) water. The runoff from the sand of the ancient river courses is good. As long as measures are taken to increase the underground freshwater level, sea and salt water intrusion boundaries can quickly go northward.