烟台夹河口近40年来环境变化的地貌响应

采用遥感解译和地貌调查相结合的方法对由于上游水利工程建设使夹河入海流量和泥沙量大幅度减少所引起的地貌响应进行了分析。结果表明，20世纪70年代以前，河口区以堆积状态为主，河口、海滩属建造期；70～90年代，河口区地貌基本保持；中淤平衡，但湿地大面积缩小；90年代以后，河口区逐渐进入侵蚀状态，河口湿地趋于消失，沙嘴不断后退，海滩地貌也随之发生一定的变化。

Geomorphic response to the environmental change at the mouth of the Jiahe River in Yantai since the last four decades

The Jiahe River had formed an estuary lagoon and an everglade in the section of the river mouth.Since 1960s,because of some water conservancy facilities were built in the river upper reaches,the quantities of discharge and sediment have sharply decreased,and the landform of the river mouth has greatly transformed.Based on field survey and remote sensing images,the result is that before 1970s the area of the river mouth was mainly in accumulation status,therefore the estuary and the beach were in progradation;from about 1970s to 1990s the river mouth landform was in the equilibrium between scouring and silting,but great acreage of the everglade had been reduced;after 1990s the river mouth was gradually in erosion status,so the everglade mostly disappeared and the sand spit was constantly retreated,therefore the beach landform was changed to a certain extent.It can be forecast that the coast of Taozi Bay will be intensively transformed in the forthcoming future,because a series coastal engineering projects will be built constantly in the section of river mouth,which can interrupt the longshore current.