考虑2012年洪水后黄河宁夏段河道的计算水面线

Flow profile of the Ningxia reach in Yellow River with 2012 flood

利用安宁渡水文站1934-2010年系列资料,增加黄河宁夏段2012年实测洪水资料,综合河道地形地貌、河床组成、滩内植物等确定各河段的综合糙率,其中卫宁段为0.020～0.034,青石段为0.018～0.034,以此为基础兼顾跨河建筑物对洪水位的影响,结合相关泥沙预测结果,由下至上逐段推出不同频率洪水的设计水面线、2020年设计水面线、施工期水面线。研究结果表明：考虑2012年洪水的水面线更符合现状河道情况,成果更为合理。

Flow profile of the Ningxia reach in Yellow River with 2012 flood is studied based on flood series data in 1934- 2010 at Anningdu hydrological station. Comprehensive roughness n is determined by river topography,riverbed composition,beach plants identified in each reach. Comprehensive roughness n is 0. 020 to 0. 034 in Weining reach,and 0. 018 to 0. 034 in Bluestone reach. Taking into account the effects of crossing building on flood level,and the predicted results of sediment,flow profiles are calculated from downstream to upstream,including different frequency design flood,2020 design flow profile,and flow profile in construction period. The results show that flow profiles agree better with the status quo of river conditions,as the flood series data including 2012 flood.