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首页> 外文期刊>Journal of the American Water Resources Association >EFFECT OF ORIENTATION OF SPATIALLY DISTRIBUTED CURVE NUMBERS IN RUNOFF CALCULATIONS
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EFFECT OF ORIENTATION OF SPATIALLY DISTRIBUTED CURVE NUMBERS IN RUNOFF CALCULATIONS

机译：径流计算中空间分布曲线数定向的影响

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摘要

The NRCS curve number approach to runoff estima- tion has traditionally been to average or "lump" spatial variability into a single number for purposes of expediency and simplicity in calculations. In contrast, the weighted runoff curve number approach, which handles each individual pixel within the water- shed separately, tends to result in larger estimates of runoff than the lumped approach. This work proposes further enhancements that consider not only spatial variability, but also the orientation of this variability with respect to the flow aggregation pattern of the drainage network. Results show that the flow aggregation pattern of the lead to much reduced estimates of runoff production. A revised model that considers overland flow lengths, consistent with existing NRCS concepts is proposed, which leads to only mildly reduced runoff estimates.
机译：NRCS曲线数估算径流的方法传统上是将空间变异性平均或“集总”为一个数，以方便计算。相比之下，加权径流曲线数方法（分别处理分水岭中的每个像素）往往会比集总方法产生更大的径流估计值。这项工作提出了进一步的增强措施，这些增强措施不仅考虑空间可变性，而且考虑到该可变性相对于排水管网的流量聚集模式的方向。结果表明，流量聚集模式导致径流产量的估计值大大降低。提出了一种修正模型，该模型考虑了陆上水流的长度，并与现有的NRCS概念保持一致，这只会导致径流估计值的减少。

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