How can streamflow and climate-landscape data be used to estimate baseflow mean response time?
How can streamflow and climate-landscape data be used to estimate baseflow mean response time?
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DOI：
10.1016/j.jhydrol.2017.12.070
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发表时间：
2017-12
影响因子：
6.4
通讯作者：
Runrun Zhang;Xi Chen;Zhicai Zhang;C. Soulsby;G. Man
中科院分区：
文献类型：
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作者：
Runrun Zhang;Xi Chen;Zhicai Zhang;C. Soulsby;G. Man
平均响应时间（MRT）是描述集水区水力行为传播的指标，反映了水文气候条件和集水区特征。为了提供一个全面的理解流域响应在较长的时间尺度上的水力过程，thMRT功能基流生成推导出使用瞬时单位线（IUH）模型，描述了地下响应有效降雨输入。IUH参数估计的基础上的“匹配测试”之间的自相关函数（ACF）来自过滤基流时间序列和IUH参数，在GLUE框架下。以泾河流域22个子流域为研究对象，运用水文气候景观指数和估算方法，对泾河流域的MRT进行了分区。结果表明，最佳参数集的确定具有较强的等同性，但MRT估计值的中位数在参数的可接受范围内相对稳定，MRT在所研究的子流域上变化明显，从几十天到一年以上不等。气候，地形和地貌被确定为三个一阶控制补给基流响应过程。人类活动，包括种植永久性作物可能延长基流MRT，从而增加动态存储。交叉验证表明，该模型可用于估算整个黄土高原类似地区无资料流域的MRT。该方法为黄土高原水资源可持续利用和生态保护提供了一种系统的方法。
Mean response time (MRT) is a metric describing the propagation of catchment hydraulic behavior that reflects both hydro-climatic conditions and catchment characteristics. To provide a comprehensive understanding of catchment response over a longer-time scale for hydraulic processes, theMRTfunction for baseflow generation was derived using an instantaneous unit hydrograph (IUH) model that describes the subsurface response to effective rainfall inputs. IUH parameters were estimated based on the “match test” between the autocorrelation function (ACFs) derived from the filtered base flow time series and from the IUH parameters, under the GLUE framework. Regionalization ofMRTwas conducted using estimates and hydroclimate-landscape indices in 22 sub-basins of the Jinghe River Basin (JRB) in the Loess Plateau of northwest China. Results indicate there is strong equifinality in determination of the best parameter sets but the median values of theMRTestimates are relatively stable in the acceptable range of the parameters.MRTsvary markedly over the studied sub-basins, ranging from tens of days to more than a year. Climate, topography and geomorphology were identified as three first-order controls on recharge-baseflow response processes. Human activities involving the cultivation of permanent crops may elongate the baseflowMRTand hence increase the dynamic storage. Cross validation suggests the model can be used to estimateMRTsin ungauged catchments in similar regions of throughout the Loess Plateau. The proposed method provides a systematic approach forMRTestimation and regionalization in terms of hydroclimate and catchment characteristics, which is helpful in the sustainable water resources utilization and ecological protection in the Loess Plateau.