灌河是苏北沿海地区最大的入海河流。支流众多,水源充足,来水面积6400平方公里,河槽容量约1500立方米/秒。建国初期,“导沂整沭”新开辟一条新沂河,由嶂山至堆沟,束堤漫滩排洪入灌河口部,承泄沂沭泗流域5.5万平方公里的来水,最大行洪6000个流量,年入海径流总量约100亿立方米。灌河口濒临黄海,终年不冻。1855年黄河北徙以后,上游来水来沙骤减,灌河口在强大风浪和弱潮流的作用下,由堆积转变为侵蚀。北部海岸一带,1855年开山与大陆相连,现在已成远离大陆7.5公里的海中孤岛。目前河口 Guan River is the largest coastal river in northern Jiangsu. Many tributaries, adequate water, water area of ​​6,400 square kilometers, the channel capacity of about 1500 cubic meters / second. In the early years of the founding of New China, “Diversion of Diversified Water Diversion by Yuyi” opened up a new Xinyi River from Dangshan to Ditou and levee floodplain into the mouth of the irrigation area, discharging 55,000 square kilometers of water from the Yishusi River Basin. 6000 floods, the total annual runoff into about 10 billion cubic meters. Guan He mouth verge of the Yellow Sea, year-round non-freezing. After the Yellow River moved northward in 1855, the incoming water and sediment from the upper reaches plummeted. The filling and estuaries changed from accumulation to erosion under the action of powerful storms and weak tides. In the northern coast, the mountains were linked to the mainland in 1855 and it has now become an island in the sea that is 7.5 kilometers far from the mainland. The current estuary