河滩种树对行洪影响试验研究

Experimental Research on Influence of Vegetated Floodplains upon Flood Carrying Capacity of River

对宽滩和窄滩河槽的过流能力以及滩地种树的的漫滩水流水力特性进行了研究表明:像珠江三角洲网河这样的窄滩复式河槽,滩地种树对水位的影响不大,也不会影响滩地的槽蓄滞洪作用;但种树使滩地水流归槽,主槽流速增大;滩地种树的利和弊及对行洪的影响是多方面的。

Experimental research is made on flood carring capacity of compound open channels with wide and narrow floodplains as well as hydrodynamic behavior of overbank flow across vegetated floodplains. Results show that for such compound channels with narrow floodplains as in the Pearl River delta estuary network, influence of vegetated floodplains upon flood stages of a channel is not very significant. Also the influence on the flood detention characteristics is slight. However, trees growing on floodplains obstruct the flow through the vegetated domain to the main channel, and as a result, main channel velocity increases. There are various advantages and disadvantages of growing trees on floodplains and their effects on flood carrying capacity should be analyzed in accordance with specific conditions.