Streamflow drought onset and severity explained by non-linear responses between climate-catchment and land surface processes

IF 3.2 3区 地球科学 Q1 Environmental Science
Aparna Raut, Poulomi Ganguli, Rohini Kumar, Bhabani Sankar Das, Nagarjuna N. Reddy, Thomas Wöhling
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引用次数: 0

Abstract

Knowledge of drought onset and its relationship with drought severity (deficit volume) is crucial for providing timely information for reservoir operations, irrigation scheduling, devising cropping choices and patterns and managing surface and groundwater water resources. An analysis of the relationship between drought onset timing and deficit volume can help in drought hazard assessments and associated risks. Despite its importance, little attention has been paid to understand the drought onset timing and its potential linkage with deficit volume for effective drought monitoring and its impact assessment. Further, only a few studies have explored the role of environmental controls, encompassing the interaction between climate, catchment and land-surface processes in influencing streamflow droughts and associated characteristics such as onset time and severity. This study leverages quality-controlled streamflow observations from 1965 to 2018 to unveil regional patterns of streamflow drought onset, at-site trends in deficit volume and detect non-linear relationships between onset timing and deficit volume across 82 rain-fed catchments in peninsular India (8°–24° N, 72°–87° E). We show that around 12% of catchments show an earlier onset of streamflow droughts in conjunction with a decreasing trend in deficit volume. Further, approximately one-third of the catchments show a significant non-linear dependency between drought deficit volume and onset time. Among catchment controls, such as soil and topographic properties, we found soil organic carbon stock and stock as dominant drivers controlling the streamflow drought onset time. Likewise, sand content and vertical distance to channel network control the streamflow deficit volume. Finally, the linkages between inferred dominant low-flow generation mechanisms and the specific combinations of environmental controls are synthesized in a conceptual diagram that might assist in developing appropriate models for low-flow simulations and predictions, especially across ungauged sites. The new insights add value to understanding the chain of physical processes linking climatic and physiographic controls on streamflow droughts, which can support drought forecasting and climate impact assessment efforts.

Abstract Image

气候-集水区和地表过程之间的非线性反应解释了河水干旱的发生和严重程度
了解干旱发生时间及其与干旱严重程度(赤字量)之间的关系,对于为水库运行、灌溉调度、制定种植选择和模式以及管理地表水和地下水资源提供及时信息至关重要。分析干旱发生时间与赤字量之间的关系有助于干旱灾害评估和相关风险。尽管干旱发生的时间及其与赤字量之间的潜在联系非常重要,但人们却很少关注如何了解干旱发生的时间及其与赤字量之间的潜在联系,以进行有效的干旱监测及其影响评估。此外,只有少数研究探讨了环境控制的作用,包括气候、集水区和地表过程在影响溪流干旱及相关特征(如开始时间和严重程度)方面的相互作用。本研究利用 1965 年至 2018 年的质量控制流域观测数据,揭示了印度半岛(北纬 8°-24°,东经 72°-87°)82 个雨水灌溉流域的流域干旱发生的区域模式、赤字量的现场趋势,并检测了发生时间与赤字量之间的非线性关系。我们的研究表明,约有 12% 的集水区在出现赤字量下降趋势的同时,还出现了较早的溪流干旱。此外,约有三分之一的集水区显示干旱赤字量与干旱开始时间之间存在显著的非线性关系。在土壤和地形特性等流域控制因素中,我们发现土壤有机碳储量和储量是控制溪流干旱发生时间的主要驱动因素。同样,含沙量和与河道网络的垂直距离也控制着溪流的干涸量。最后,我们将推断出的主要低流量产生机制与环境控制的具体组合之间的联系综合成一个概念图,这可能有助于开发适当的低流量模拟和预测模型,尤其是在无测站的地点。这些新见解有助于理解将气候和地貌控制与溪流干旱联系起来的物理过程链,从而为干旱预报和气候影响评估工作提供支持。
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来源期刊
Hydrological Processes
Hydrological Processes 环境科学-水资源
CiteScore
6.00
自引率
12.50%
发文量
313
审稿时长
2-4 weeks
期刊介绍: Hydrological Processes is an international journal that publishes original scientific papers advancing understanding of the mechanisms underlying the movement and storage of water in the environment, and the interaction of water with geological, biogeochemical, atmospheric and ecological systems. Not all papers related to water resources are appropriate for submission to this journal; rather we seek papers that clearly articulate the role(s) of hydrological processes.
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