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1 河流及险工现状1.1 潘河的基本情况潘河发源于方城县七峰山南麓,属长江流域唐河支流。潘河流域西部为岗坡、山丘区,中部及东南部为平原地带,北部环山为长江、淮河流域的分界线。潘河在方城县境内主要支流有:清河和三里河,在县境内全长41km,流域面积347km~2,河道比降1/300,河道较弯曲,弯曲系数1.2,凹岸冲刷切割严重,一般河槽宽约80～150m。1.2 险工现状①潘河城区险工段全长4000m,以县城东西轴线凤瑞路上的潘河大桥为界,南北各2000m,是新老城区的天然纵向分界线,左岸垂直切割形成3～7m高的直立陡岸,沙滩淤积,形成大面积河滩。②局部河段过水断面窄,阻碍洪水宣泄,形成4处卡口。
1 rivers and the current status of workers 1.1 The basic situation of Panhe Pan River originated in Fangcheng County, south of Qifeng Mountain, belonging to the tributaries of the Tanghe River in the Yangtze River. Pan River Basin in the western slope Gang, hills, central and southeast of the plains, the northern ring of the Yangtze River, Huaihe River Basin boundaries. The major tributaries of Panhe in Fangcheng County are: Qinghe River and Sanli River, with a total length of 41km, a catchment area of 347km ~ 2 and a riverway ratio of 1/300. The river is relatively curved with a bending coefficient of 1.2 and serious grazing erosion and cutting. The general width of the river channel 80 ~ 150m. 1.2 Present Situation of Insurers ① The total length of Panhe urban insurance section is 4000m, bounded by the Panhe Bridge on the east-west axis of Fengxian Road in the county seat and 2000m north-south, which is the natural longitudinal dividing line between the old and new urban areas. The vertical cutting on the left bank forms 3 ~ 7m high Upright steep shore, siltation of the beach, forming a large flood beach. ② The cross section of the local river section is narrow, hindering flood catharsis and forming 4 bayonet ports.