Map correlation method: Selection of a reference streamgage to estimate daily streamflow at ungaged catchments
Map correlation method: Selection of a reference streamgage to estimate daily streamflow at ungaged catchments
复制标题
地图相关方法：选择参考水流计来估计未计水流域的每日水流量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Vogel
中科院分区：
文献类型：
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作者：
S. Archfield;R. Vogel
日径流时间序列对于非常广泛的水文问题是至关重要的。虽然每日径流时间序列很容易从计量流域获得，但在没有实测径流信息的集水区通常需要径流信息。在未蓄水集水区，估算日径流时间序列的方法通常需要使用参考径流量具，它将参考径流量具下的径流时间序列的特性转移到未蓄水集水区。因此，参考流量的选择是与估算未成熟流域的日径流量有关的主要挑战之一。参考流量计通常是通过选择最近的流量计来选择的；然而，本文表明，选择最近的流量计并不提供一致的选择标准。我们介绍了一种新的方法，称为MAP相关法，该方法选择日径流与未覆盖流域最相关的参考流量。当应用于估计新英格兰南部28个流量计的日径流量时，通过地图相关法选择的参考流量计估计的日径流量通常提供了通过选择和使用最近的流量计估计的日径流时间序列的改进估计。MAP相关方法可能还具有许多其他应用的潜力，包括确定径流网络中的冗余和唯一性、校准未成熟点的降雨径流模型以及用于集水区分类。
Daily streamflow time series are critical to a very broad range of hydrologic problems. Whereas daily streamflow time series are readily obtained from gaged catchments, streamflow information is commonly needed at catchments for which no measured streamflow information exists. At ungaged catchments, methods to estimate daily streamflow time series typically require the use of a reference streamgage, which transfers properties of the streamflow time series at a reference streamgage to the ungaged catchment. Therefore, the selection of a reference streamgage is one of the central challenges associated with estimation of daily streamflow at ungaged basins. The reference streamgage is typically selected by choosing the nearest streamgage; however, this paper shows that selection of the nearest streamgage does not provide a consistent selection criterion. We introduce a new method, termed the map‐correlation method, which selects the reference streamgage whose daily streamflows are most correlated with an ungaged catchment. When applied to the estimation of daily streamflow at 28 streamgages across southern New England, daily streamflows estimated by a reference streamgage selected using the map‐correlation method generally provides improved estimates of daily streamflow time series over streamflows estimated by the selection and use of the nearest streamgage. The map correlation method could have potential for many other applications including identifying redundancy and uniqueness in a streamgage network, calibration of rainfall runoff models at ungaged sites, as well as for use in catchment classification.