【摘要】 以容桂水道与顺德支流交汇河段为例,对1999—2017年河段深泓平面、垂向变化、典型横断面变化、河相关系及冲淤变化进行了深入分析,并对河床演变影响因素及趋势进行了预测,为珠江三角洲网河区典型交汇河段特征因素的演变特点及规律提供了参考依据。主要结论为:(1)容桂水道与顺德支流交汇河段河道堤防逐步完成达标加固,岸滩趋于稳定。(2)顺德支流和容桂水道交汇前河道深泓线平面均整体偏向右岸,交汇口以下容桂水道河段深泓线整体居中,深泓平面和垂向整体变化不大。(3)交汇河段各横断面主槽形态基本稳定,深槽平面位置和河床高程自然调整。(4)交汇河段河宽总体相对稳定,交汇口上游顺德支流整体略有淤积,容桂水道主槽略有冲刷,汇流后容桂水道下游略有淤积,年均冲刷厚度约为0.34 cm,河道容积变化较小,总体冲刷强度相对不大。更多还原

【Abstract】 The river system in the Pearl River Delta was crisscrossed and the waterways were interconnected with each other. This paper was taken the intersection of Ronggui waterway and Shunde tributaries as an example,and was analyzed on the river deep plane,vertical change,typical cross section change,river phase relationship,and erosion and siltation change from 1999 to 2017.This paper was also predicted the influencing factors and trends of river bed evolution,and was provided references for the characteristics and laws of evolution in the typical intersection of the river network in the Pearl River Delta. The main conclusions were:(1) The embankment in the intersection of Ronggui waterway and Shunde tributaries was gradually completed the standard reinforcement,and the shore beach was tended to be stable.(2)Before the junction of Shunde tributaries and Ronggui waterway,the plane of the deep river line was generally biased towards the right bank,the deep line of the Ronggui waterway below the intersection was placed in the middle,and the deep plane and vertical direction of river were not much changed.(3) The shape of the main grooves in each intersection of the river was basically stable,and the position of the deep grooves and the elevation of the river bed were naturally adjusted.(4) The width of the river in the intersection was relatively stable,the Shunde tributaries in the upper reaches of the intersection was slightly silted up,and the main channel of the Ronggui waterway was slightly scoured. After the confluence,the lower reaches of the Ronggui waterway were slightly silted up and the annual scour thickness was about 0. 34 cm.Besides,the change of the river volume was small,and the overall scour intensity was also relatively small.更多还原