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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Relative contributions of runoff and sediment from sources within a road prism and implications for total sediment delivery
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Relative contributions of runoff and sediment from sources within a road prism and implications for total sediment delivery

机译：公路棱镜内源头的径流和泥沙的相对贡献及其对总泥沙输送的影响

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This study examines runoff and sediment generation rates within the road prism on unsealed road segments in the Cuttagee Creek catchment near Bermagui in New South Wales, Australia. A large (600 m(2)) rainfall simulator was used to measure runoff and sediment yields from each of the potential sediment and runoff sources and pathways. These included the road surface, table-drain, upslope contributing area and cutslope face, and the entire road segment as measured at the drain outlet. Experiments were conducted on two major types of road (ridge-top and cut-and-fill) of varying traffic usage and maintenance standard for two 30-minute simulations of increasing rainfall intensity. From the range of possible sources within the road prism, the road surface produced the dominant source of excess runoff and sediment at each site with limited contributions from the table-drain, cutslope face or contributing hillslope. Sediment generation varied significantly with road usage and traffic intensity. Road usage was strongly related to the amount of loose available sediment as measured prior to the experiments. Table-drains acted primarily as sediment traps during the low rainfall event but changes in sediment concentration within the drains were observed as runoff volumes increased during the higher rainfall event of 110 mill h(-1), releasing sediment previously stored in litter and organic dams. The experiments demonstrate the potential roles of various features of the road prism in the generation and movement of sediment and water. Copyright (C) 2006 John Wiley & Sons, Ltd.
机译：这项研究检查了澳大利亚新南威尔士州伯马吉附近的Cuttagee Creek流域未密封路段的路棱镜内径流和沉积物的产生速率。大型（600 m（2））降雨模拟器用于测量来自每个潜在沉积物和径流源及途径的径流和沉积物产量。其中包括路面，排水沟，上坡贡献面积和下坡面，以及在排水口处测量的整个路段。针对交通流量和维护标准各不相同的两种主要道路（山顶和填土）进行了实验，以进行两次30分钟的模拟降雨强度增加的模拟。从道路棱镜内的各种可能来源来看，路面产生了每个站点过量径流和沉积物的主要来源，而表排水沟，边坡面或贡献的山坡贡献有限。沉积物的产生随道路使用和交通强度的变化而显着变化。道路使用情况与实验前测得的可用稀疏沉积物数量密切相关。在低降雨事件中，表型表层主要起沉积物的作用，但在较高的降雨过程中，在110毫升h（-1）期间，随着径流量的增加，观察到了排水沟内沉积物浓度的变化，释放了先前储存在垃圾和有机坝中的沉积物。 。实验证明了道路棱镜的各种特征在沉积物和水的产生和运动中的潜在作用。版权所有（C）2006 John Wiley＆Sons，Ltd.

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