当前位置: X-MOL 学术Hydrol. Process. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
How realistic are water-balance closure assumptions? A demonstration from the southern sierra critical zone observatory and kings river experimental watersheds
Hydrological Processes ( IF 3.2 ) Pub Date : 2021-04-29 , DOI: 10.1002/hyp.14199
Mohammad Safeeq 1, 2 , Ryan R. Bart 3 , Norman F. Pelak 3 , Chandan K. Singh 3 , David N. Dralle 4 , Peter Hartsough 5 , Joseph W. Wagenbrenner 6
Affiliation  

The water balance is an essential tool for hydrologic studies and quantifying water-balance components is the focus of many research catchments. A fundamental question remains regarding the appropriateness of water-balance closure assumptions when not all components are available. In this study, we leverage in-situ measurements of water fluxes and storage from the Southern Sierra Critical Zone Observatory (SSCZO) and the Kings River Experimental Watersheds (KREW) to investigate annual water-balance closure errors across large (1016–5389 km2) river basins and small (0.5–5 km2) headwater-catchment scales in the southern Sierra Nevada. The results showed that while long-term water balance in river basins can be closed within 10% of precipitation, in the smaller headwater catchments as much as a quarter of precipitation remained unaccounted for. A detailed diagnosis of this water-balance closure error using distributed soil moisture measurements in the top 1 m suggests an unaccounted deeper storage and a net groundwater export from the headwater catchments. This imbalance was also found to be very sensitive to the timescales over which water-balance closures were attempted. While some of the closure errors in the simple water balance can be attributed to measurement uncertainties, we argue for a broader consideration of groundwater exchange when evaluating hydrological processes at headwater scales, as the assumption of negligible net groundwater exchange may lead to an overestimation of fluxes derived from the water balance method.

中文翻译:

水平衡关闭假设有多现实?南部塞拉利昂临界区天文台和国王河实验分水岭的示范

水平衡是水文学研究的重要工具,量化水平衡组成部分是许多研究区的重点。当并非所有组成部分都可用时,关于水平衡关闭假设的适当性仍然存在一个基本问题。在这项研究中,我们利用南部塞拉利昂临界区天文台(SSCZO)和金斯河实验流域(KREW)的水通量和储水量的原位测量来研究大面积(1016–5389 km 2)的年度水平衡关闭误差。)流域和小型(0.5-5 km 2)内华达山脉南部的集水区规模。结果表明,虽然流域的长期水平衡可以在降水量的10%之内关闭,但在较小的源头集水区,多达四分之一的降水量仍未得到解决。使用顶部1 m处的分布式土壤水分测量结果对这种水平衡关闭误差进行的详细诊断表明,未解释的更深层存储和来自源水集水区的净地下水输出。还发现这种失衡对尝试关闭水平衡的时间表非常敏感。虽然简单的水平衡中的某些闭合误差可以归因于测量的不确定性,但我们认为在评估上游水位的水文过程时,应更广泛地考虑地下水交换,
更新日期:2021-05-22
down
wechat
bug