Experimental Study on Hydraulic Characteristics of Water Flow with Complex Flexible Vegetation
The complex morphology of natural river vegetation is an important factor affecting water flow structure and flow resistance.Accurately describing the plant morphology is beneficial for reasonably explaining the changes in water hydraulic characteristics.In this paper,based on the real aquatic plant,the flume experiments using three forms of plastic simulated vegetation(tufted grass,clustered herbaceous plants,and flat single leaf plants)to study the mechanism of complex forms of flexible vegetation on flow structure and resistance characteristics are carried out.It is found that:① The impact of complex flexible vegetation on water flow structure is significantly non-uniform,that is,the parts with concentrated leaf distribution have a greater blocking effect on water flow,and sudden changes in vegetation morphology can cause significant shear effects on water flow,and this effect is more pronounced when vegetation density increases;② Among them,the dominant flow pattern of clustered herbaceous plants is an inward interactive flow pattern that is conducive to sediment deposition,the dominant flow pattern of flat single leaf plants is an outward interactive flow pattern that is conducive to sediment initiation and material transport,and the dominant flow pattern of branched leaf plants is an outward interactive flow pattern that is conducive to sediment initiation and material transport at higher and lower densities,an inward interactive flow pattern that is favorable for sediment deposition at moderate density;③ The resistance of the three types of vegetation follows a pattern of clustered grass>branched belt leaves>flat single leaves.The degree of curvature of vegetation under the action of water flow is planar single leaves>clustered grass>branched belt leaves.
Open channel flowFlexible vegetationComplex morphologyFlow structureResistance characteristics
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