Runoff production on forest roads in a steep, mountain catchment
Runoff production on forest roads in a steep, mountain catchment
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陡峭山区森林道路的径流产生
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
J. Jones
中科院分区：
文献类型：
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作者：
B. Wemple;J. Jones
本研究调查了在以地下水流为主的陡峭森林景观中，道路如何与山坡水流相互作用，以及道路与山坡水流路径的相互作用如何影响二级流域风暴期间的水文响应。对俄勒冈州安德鲁斯森林 12 个子流域（排水至路段）的径流进行了连续测量，覆盖了 101 公顷二级流域 (WS3) 的 14%。将 1996 年水年观测到的径流与基于运动学地下暴雨流的简单模型对径流时间和山坡地下水位拦截的预测进行了比较。观察到的径流行为与模型估计一致，这一发现强调了这种简单方法在预测和解释陡峭山坡上建造的森林道路径流动态方面的实用性。研究区域的路段至少以四种不同的方式与复杂的地形相互作用，根据地形特征可能产生截然不同的影响。山坡长度、土壤深度和路堤深度解释了子流水区和风暴事件之间道路径流产生的大部分变化。特别是在大型风暴事件期间，大多数装有仪表的路段拦截了地下水流，并将其引导至沟渠，然后直接引导至溪流，其时机导致流域范围内的水位线上升。本研究中使用的方法可能有助于模型开发和针对路段进行拆除或恢复。
This study investigated how roads interact with hillslope flow in a steep, forested landscape dominated by subsurface flow and how road interactions with hillslope flow paths influence hydrologic response during storms in a second‐order catchment. Runoff was measured continuously from 12 subcatchments draining to road segments and covering 14% of a 101‐ha, second‐order catchment (WS3) in the Andrews Forest, Oregon. Observed runoff over the 1996 water year was compared to predictions for runoff timing and interception of a hillslope water table based on a simple model of kinematic subsurface storm flow. Observed runoff behavior was consistent with model estimates, a finding that underscores the utility of this simple approach for predicting and explaining runoff dynamics on forest roads constructed on steep hillslopes. Road segments in the study area interacted in at least four distinct ways with complex landforms, potentially producing very different effects depending on landform characteristics. Hillslope length, soil depth, and cutbank depth explained much of the variation in road runoff production among subcatchments and among storm events. Especially during large storm events, a majority of instrumented road segments intercepted subsurface flow and routed it to ditches and thence directly to streams with a timing that contributed to the rising limb of the catchment‐wide hydrograph. The approach used in this study may be useful for model development and for targeting road segments for removal or restoration.