A multiple hydrograph separation technique for identifying hydrological model structures and an interpretation of dominant process controls on flow duration curves
A multiple hydrograph separation technique for identifying hydrological model structures and an interpretation of dominant process controls on flow duration curves
复制标题
DOI：
10.1002/hyp.14569
复制
发表时间：
2022-03
影响因子：
3.2
通讯作者：
C. Leong;Y. Yokoo
中科院分区：
文献类型：
--
作者：
C. Leong;Y. Yokoo
在理解控制流动持续曲线 (FDC) 形状的过程控制方面已经取得了重大进展。然而，所获得的知识仍然缺乏向大空间尺度的可转移性，部分原因是代表未观测到的地下层的模型结构的固定表示。在提高 FDC 研究的大规模适用性/可转移性的背景下：（1）我们提出了一种新方法来转换/重组水文模型中地下成分的表示，使其在任何环境中都具有灵活性和适应性；（2）对影响 FDC 形状的主导过程提供全面的解释。这种灵活的结构是由一系列多个连接的线性水库设计而成，这些水库是根据独特的多重过程线分离程序开发的，以估计正在发挥作用的不同水文过程的数量。主要结果是：（1）湿润流域比干旱流域具有更复杂的模型结构（更多的水库）；表明地下过程在潮湿的流域中比在干燥的流域中可能更常见。干旱流域有更多近地表发生的过程，因此模型结构不太复杂。然而，干流流域的内部水库可能需要更复杂的设施。 (2)中间储层控制主导过程向底部的干扰强度决定了FDC的形状,并且这种干扰强度随着干旱而增强。这一新颖的发现是，模型结构可以通过流域产生流量的能力以及低流量持续性的强度来确定。因此，我们提出了一个基于 FDC 形状的灵活模型结构开发的概念框架。本研究中模型的灵活转换应该有助于寻求模型在大空间尺度上的可迁移性的研究。
There has been significant progress made towards understanding the process controls that govern the shapes of flow duration curves (FDC). However, the transferability of the knowledge gained to large spatial scales is still lacking, partly due to the fixed representation of the model structures representing the unobserved underground layer. In the context of improving large scale applicability/transferability of FDC studies: (1) we propose a novel approach to transform/restructure the representation of the subsurface component in hydrological models to be flexible and adaptable in any environment and (2) provide a thorough interpretation of the dominant processes that impact the shape of FDCs. The flexible structure is designed from a series of multiple connected linear reservoirs that are developed from a unique multiple hydrograph separation procedure, to estimate the number of distinct hydrological processes at play. The main results are: (1) wet catchments have more complex model structures (more reservoirs) than arid catchments; indicating that subsurface processes are potentially more present in wet catchments than in drier ones. Dry catchments have more near surface occurring processes, thus have less complex model structures. However, more complexity is potentially required within the internal reservoirs of dry catchments. (2) The strength of interference in the intermediate reservoirs in controlling the dominant processes towards the bottom determined the shape of FDCs, and this increased with aridity. The novel finding is that a model structure can be determined by the catchment's ability to generate flows as well as the strength of low flow persistence. Hence, we propose a conceptual framework for the development of flexible model structures based on the shapes of FDCs. The transformation of models to be flexible in this research, should contribute to studies that seek the transferability of models over large spatial scales.