从遥感信息看连云港西海堤工程的隐患

A GLIMPSE OF THE POTENTIAL DISADVANTAGES OF LIANYUNGANG WEST SEA WALL CONSTRUCTION THROUGH REMOTE SENSING INFORMATION

位于黄海西海岸中部的连云港是重要的万吨级商港。港池外有连岛作为海上屏障。为了扩大 吞吐能力，拟建造连按陆地与连云岛西端长达６７００ｍ的西海堤，以期防淤防浪。 多时相遥感图像动态分析显示，连云港东侧河口外航道不断西移，河口异重流也向西飘移， 表明该区存在着自东向西的沿岸流。美国陆地卫星ＭＳＳ图像上沿岸流自废黄河口一带流向连云港 地区的特征也很清晰，并对侵蚀岸产生的大量泥沙携在连云港一带的特征也有明显显示。 连云港地区原来存在绕连岛右旋的流场。西海堤未建前，泥沙尚可顺利通过港池。西海堤的 建成，则破坏了现有流场，阻断泥沙流，将导致大量泥沙在港池内消能落淤，对港口造成危害。

Lianyungang Port, located on the middle part of west coast of Yellow Sea, is a important commercial port with the Liandao island as a natural defence. As a result of tae effort to enlarge the handling capacity, a plan has been drawing to construct a west sea wall, with a length of 6700m, linking the west end of Liandao island to the continent for protecting port area from the silting up and the wave. Dynamic analysis with Multi-temporal Aerial images shows that the sea course of the river mouth on the east side of Lianyungang port is shifting to the west, so is the river mouth density current. They have revealed the exsistance of the coastal current, from the East to the West. The analysis of Landsat MSS images has indicated that the coastal current is trending from the river mouth of abandoned Yellow River to the Lianyungang area, bringing the mud and sand to the Lianyungang area. In Lianyungang area, there exists a dextrorotatory current field which gurrentee the passing through of mud and sand. The construction of the west sea wail would destroy the current field, block the mud--sand current, resulting in a large amount of mud-sand depositing in the port area and bringing harm to the port.