Assessing the Catchment Storage Function Through a Dual‐Storage Concept
Assessing the Catchment Storage Function Through a Dual‐Storage Concept
复制标题
DOI：
10.1029/2018wr022856
复制
发表时间：
2019-01
影响因子：
5.4
通讯作者：
G. Carrer;J. Klaus;L. Pfister
中科院分区：
文献类型：
--
作者：
G. Carrer;J. Klaus;L. Pfister
除其他外，集水储存通过调节景观单元之间的水文连通性来控制大多数生态水文过程。然而，人们对存储的内部动态及其与液压连接的反馈知之甚少。在这里，我们评估了综合集总方法的能力(即，结合集水区水量平衡和退缩分析)，将总的动态蓄水量(来自水量平衡)划分为水力连接的(根据退缩分析估计的部分补给河流)和水力不相连的部分(即，由降水和蒸散驱动的剩余存储)。将我们的组合方法的结果与卢森堡试验性的韦尔巴赫流域(0.45平方公里)的基于点测量的估计(使用井和土壤湿度数据)进行了比较。我们发现液压连接存储的一致性很好，但液压非连接存储的结果相反。在湿润时期，后者的特点是相反的动力学，而我们的集中方法显示出逐步的偏差。总体而言，这些结果表明我们的分区存储方法具有良好的能力，以及它对系统和随机偏差的敏感性。考虑到这些可能的偏差，这种新的储存概念提供了关于集水区状态(即储存为主或释放为主)的相关和可量化的信息。在双存储曲线图(液压断开连接存储与连接存储)中表示时，这一点进一步突出。与传统的蓄泄关系相比，它允许在不需要额外数据的情况下评估汇流效率(汇流将存储转化为径流的能力)。我们期望，储存功能的这种机械概念化将为评估集水区功能和集水区分类提供新的机会。
Catchment storage controls most ecohydrological processes by modulating, among other things, the hydrological connectivity between landscape units. However, little is known about the internal dynamics of storage and its feedback with hydraulic connectivity. Here we evaluate the capability of a combined lumped approach (i.e., combining catchment water balance and recession analysis) to partition total dynamic storage (from the water balance) into hydraulically connected (the part feeding stream estimated from recession analysis) and hydraulically disconnected components (i.e., the remaining storage driven by precipitation and evapotranspiration). Results from our combined approach were compared to a point measurement‐based estimation (using wells and soil moisture data) from the experimental Weierbach catchment in Luxembourg (0.45 km2). We found good agreement for the hydraulically connected storage but contrasted results for the hydraulically disconnected storage. During wet periods, the latter were characterized by opposite dynamics and our lumped approach showed step‐by‐step deviations. Overall, these results indicated a good capability of our approach to partition storage, as well as its sensitivity to systematic and random deviations. Considering these possible deviations, this new conceptualization of storage provides relevant and quantifiable information about catchment state (i.e., storage dominated or release dominated). This is further highlighted when represented in a dual‐storage plot (hydraulically disconnected vs. connected storage). Compared to classic storage‐discharge relationships, it allows catchment efficiency (capacity of the catchment to convert storage into streamflow) to be assessed without the need for additional data. We expect that this mechanistic conceptualization of the storage function will provide new opportunities for assessing catchment functioning and catchment classification.