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滦河横贯河北省北部,全长1200公里,流域面积约45000平方公里,年平均迳流量为45.5亿立方米,每年把约1900万吨泥沙输入渤海,平均含沙量仅次于黄河而高于长江。大量泥沙堆积于河口外的浅海中,形成扇状三角洲。同时在河口外海域的东和东北强风浪(最大风速可达20米/秒)的作用下,沿岸形成了一系列的滨岸沙坝,类似墨西哥湾西岸的里奥·格兰德(Rio Grande)河口。
The Luan River runs through the northern part of Hebei Province with a total length of 1,200 kilometers and a drainage area of 45,000 square kilometers. The annual average flow rate is 4.55 billion cubic meters. Each year, about 19 million tons of sediment are input into the Bohai Sea and the average sediment concentration is second only to the Yellow River In the Yangtze River. A large amount of sediment accumulated in the shallow sea outside the estuary, fan-shaped delta. At the same time, in the estuarine waters of the east and northeast strong winds (the maximum wind speed of up to 20 m / s), the coast formed a series of coastal barrage, similar to the Gulf of Mexico Rio Grande (Rio Grande )estuary.