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渤海莱州湾南岸，是我国海水入侵灾害最严重的岸段。依据入侵物源可将广义海水入侵划分为两种基本类型：来源于现代海水的狭义海水入侵和物源于浅层第四纪沉积层中古海水（包括一般地下咸水及地下卤水）的地下咸水入侵。它们的成因、机理和危害差异明显；地下卤水入侵是一种特殊类型，造灾程度最高。海岸地貌和第四纪水文地质环境，是控制海水入侵类型区划的主导因素。莱州湾南岸不同岸段海岸环境差异，形成了海水入侵区、地下咸水入侵区和海、咸水混合入侵区３种类型区，可具体区划为：莱州市北部海岸海水入侵区，胶莱河－沙河河口平源海、咸水混合入侵区，昌邑北部潍河河口平原海、咸水混合入侵区，寿光北部平原地下咸水入侵区等４个区。类型区划分将有助于海水入侵灾害防治工程。
The southern bank of Laizhou Bay in the Bohai Sea is the most severely damaged shore section of China’s seawater intrusion. Based on the source of intrusion, the generalized sea-water intrusion can be divided into two basic types: the narrow sea-water intrusion originating from the modern seawater and the underground salty originating from the pale-sea water in the shallow Quaternary sediments (including general underground salt water and underground brine) Water invasion. Their causes, mechanisms and hazards are obvious differences; underground brine invasion is a special type, the highest degree of disaster. Coastal landforms and Quaternary hydrogeological environment are the dominant factors that control the type of seawater intrusion. There are three types of zones in the coastal area of the southern coast of Laizhou Bay on the coastline of the southern coast of the Laizhou Bay, forming three kinds of zones: seawater intrusion zone, underground saltwater intrusion zone and sea and salt water mixed intrusion zone. - The Pinghehai and salt water mixed intrusion zones in the Shahe estuary, the plain seawater and salt water mixed in the Weihe Estuary in the north of Changyi, and the saltwater intrusion zone in the northern plain of Shouguang. The division of type zones will help seawater intrusion disaster prevention and control projects.