CAJ | 학술논문

天然河道中许多都是具有主槽和滩地的复式河槽,水流漫滩以后,复式河槽的水流结构发生复杂的变化.而天然河道漫滩上常常生长着各种植物,水中植被的存在增加了河床的阻力,如何确定流速分布和流量十分重要.本文基于植被作用下水流阻力的等效平衡原理,提出刚性植被等效附加阻力系数以及植被等效综合阻力系数的计算方法.通过运用SKM方法计算植被作用下的复式河槽垂线平均流速的横向分布,结果表明,本文提出的植被等效综合阻力系数的计算方法是可行的,能较好地确定植被作用下的复式河道垂线平均流速的横向分布.
천연하도중허다도시구유주조화탄지적복식하조,수류만탄이후,복식하조적수류결구발생복잡적변화.이천연하도만탄상상상생장착각충식물,수중식피적존재증가료하상적조력,여하학정류속분포화류량십분중요.본문기우식피작용하수류조력적등효평형원리,제출강성식피등효부가조력계수이급식피등효종합조력계수적계산방법.통과운용SKM방법계산식피작용하적복식하조수선평균류속적횡향분포,결과표명,본문제출적식피등효종합조력계수적계산방법시가행적,능교호지학정식피작용하적복식하도수선평균류속적횡향분포.
Compound channels composed of the main channel and its associated floodplains widely exist in natural rivers. When water in the main channel flows in an out-of-bank manner onto the adjoining flood?plain, the flow structure is usually very complex. However, in natural rivers, floodplains and river banks are often home to many kinds of vegetation. Generally,such vegetation increases stabilization for banks and channels, but also increases the flow resistance and changes the velocity distribution and affects the dis?charge capacity. Hence,how to determine the velocity distribution and discharge become very important. In this paper, based on the equivalent balance of flow resistance, the equivalent additional resistance coeffi?cient and equivalent composite resistance coefficient of vegetated channels are proposed. Then using the Shiono and Knight method (SKM) together with the proposed equivalent composite resistance method, the lateral distribution of depth-averaged velocity in compound channels with vegetated floodplains are deter?mined. The results show that the computational method for composite resistance coefficient in the vegetated compound channel is feasible and can give good predictions for the velocity distribution for the type of channel,combining the SKM.