The southern coast of Laizhou Bay

Bohai Sea

is one of the areas in China most seriously impacted by seawater intrusion. Based on the sources of intruding waterbodies

seawater intrusion can be divided into two types: intrusion of saline water derived from modern seawater

and intrusion of subsurface brine and saline water derived from paleo-seawater in shallow Quaternary sediments. There are some distinct differences in their formation

mechanism and damage. The subsurface brine intrusion is a special type

which can cause very serious disaster. The coastal landform and the Quaternary hydrogeological environment are predominant factors in the classification of seawater intrusion types. Various coastal environments in different coastal sections result in three types of intrusion: seawater intrusion

saline groundwater intrusion

and mixed seawater and saline water intrusion

in the southern coast of Laizhou Bay

which can be divided into four areas: the seawater intrusion area in the northern Laizhou City coast

the mixed seawater and saline groundwater intrusion area in the Baisha River-Jiaolai River mouth plain area

the mixed seawater and saline groundwater intrusion area in the Weihe River mouth plain area northern Changyi county coast

and the saline ground-water intrusion area in the northern Shouguang plains.