论文部分内容阅读
通过收集东江下游博罗河段历年的水文、地形资料,首先从水沙分配变化和流量水位变化两个方面对博罗水文站的水沙特性进行了分析,然后选取研究河段各历史年份的河床平均高程、深泓、河道整体冲淤和特征断面等研究对象,分析了研究河段的河床异变特性.认为博罗站年平均流量呈微弱增加趋势,而输沙量则总体呈下降趋势;1997年以后的12年间,研究河段河床地形大幅下切,下切幅度自上而下沿程递增,刷深幅度远远超过了此前30多年的变幅,且与河流自然冲淤状态下的冲刷形态明显不同,应为采砂所致,这是本研究河段水沙变异的最主要原因,对本河段的动力条件与河床演变产生了深刻影响.
By collecting the hydrological and topographic data of the Boluo section of the lower reaches of the Dongjiang River, this paper analyzes the water and sediment characteristics of Boluo Hydrological Station from two aspects: the change of water and sediment distribution and the change of water level. Then, The mean height of the riverbed, the depth of the river, the erosion and sedimentation of the whole riverway and the characteristic cross-section of the riverbed are analyzed, and the riverbed deformation characteristics of the river section are analyzed, the average annual flow rate at Boluo station shows a slight increase trend, In the 12 years after 1997, the riverbed topography was drastically undercut and the undercutting amplitude increased from top to bottom. The depth of brushing far exceeded that of the previous 30 years, The obvious difference is due to sand mining, which is the most important reason for the variation of runoff and sediment in this study, which has a profound impact on the dynamic conditions and river bed evolution in this reach.