水利水电技术（中英文）

2000年以来,大规模采砂引起了赣江南昌河段河槽形态的显著变化,给沿岸行洪安全及河势稳定等带来了一系列影响。利用2003年、2005年、2013年、2015年、2018年赣江南昌河段主支及南支的实测地形资料,采用河段平均的方法分析了2000年以来南昌河段河槽形态的变化过程及特点。根据人为采砂对该河段河槽形态的演化影响,将2003—2018年分为采砂期(2003—2013年)和整治期(2013—2018年)两个阶段。在采砂期,河道平面形态变化显著,沿程深泓摆动宽度较大;断面形态变化明显,断面水深和面积大幅增加,河道下切剧烈。在整治期,河道平面形态总体保持稳定,沿程深泓摆动宽度大幅减小;相应地河道断面形态变化幅度较采砂期也大幅减小,河槽水深、面积及河相系数在整治期的年均变量均小于采砂期。

Significant change of the channel morphology of Nanchang Reach of Ganjiang River is caused by large-scale sand mining since 2000, which leads to a series of impacts on the safety of flood discharge along the river bank and the river regime stability. In accordance with the measured topographic data in 2003, 2005, 2013, 2015 and 2018 of the main and south branches of Nanchang reach of Ganjiang River, the changing process and the characteristics of the channel morphology of Nanchang Reach are analyzed with the Reach-averaged Method. According to the impact from the artificial sand mining on the evolution of channel morphology of the river reach, the period from 2003 to 2018 is divided into two phases: the sand mining phase(2003—2013) and the sand mining regulation phase(2013—2018). During the sand mining phase, the plane morphology of the river channel is significantly changed with a larger swing width of the thalweg along the river, while the change of the river cross-section morphology is obvious with great increases of both the water depth and the area of the cross-section as well as serious undercutting of the river channel. In the sand mining regulation phase, the overall plane morphology of the river channel basically keeps stable with great decrease of the swing width of the thalweg along the river, while the changing amplitude of the river cross-section morphology is correspondingly decreased if compared with that during the sand mining phase; moreover, all the mean annual variables of water depth, area and river regime coefficient in the sand mining regulation phase are less than those during the sand mining phase.