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1.滦河下游河道性状滦河自京山铁路桥出山后,进入下游平原地带,成为昌黎县与滦县、滦南县、乐亭县的界河。昌黎县位于左岸,此段流程长75.4km,在昌黎县境内的流域面积199.5km~2,属河北拗陷冀东部分,地貌呈平原类型,由山前平原向东南逐步变为滦河三角洲平原,地面高程变化20～1m,河道纵坡0.66‰。由于此段河床为细泥砂质,河道冲淤及改道变化大,故河道表现为游荡性河道性状。
1. Luanhe River downstream traits Luan River from the Jingshan Railway Bridge out of the mountain, into the lower reaches of the plains, as Changli County and Luanxian, Luannan County, Leting County border river. Located on the left bank of Changli County, Changli County is 75.4km long. The drainage area in Changli County is 199.5km ~ 2. It belongs to the eastern Hebei part of Hebei depression and has a plain landscape. From the piedmont plain to the southeast, it gradually becomes Luanhe Delta Plain , The ground elevation changes 20 ~ 1m, longitudinal gradient 0.66 ‰. Due to the fine silt in this section of the river bed, the scouring and siltation of the riverway and the diversion of the diversion vary widely, the riverway is characterized by wandering river features.