基于地下水储量和NDVI异常的林波波河流域生态水文干旱条件解耦研究

IF 3.1 Q2 WATER RESOURCES Hydrology Pub Date : 2023-08-12 DOI:10.3390/hydrology10080170
Kyungeun Kim, T. Scanlon, Sophia Bakar, V. Lakshmi
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引用次数: 0

摘要

预计干旱的强度和频率将随着全球平均气温的上升而增加。然而,并非所有干旱指数都能平等地反映每个水文成分对缺水期持续时间和程度的各种影响。虽然由于降水是主要的输入,这些指数往往彼此一致,但地下水补给、土壤水分记忆和植被动态引起的异质响应可能导致可识别的干旱条件脱钩。作为半干旱流域,林波波河流域(LRB)是一个严重缺水的地区,其独特的气候模式经常影响水文极端事件。在本研究中,我们发现植被指数没有显著的长期趋势(s统计量9;p值0.779),与模拟地下水异常相反(s统计量-57;p值0.05),持续18年(2004-2022)。尽管在盆地平均时,NDVI和干旱指数的Mann-Kendall时间序列统计量不显著,但空间异质性进一步揭示了植被与地下水异常之间的解耦趋势在东南部的洼地、低地含水层中确实显著(p值< 0.05),而在基岩含水层占主导地位的LRB中西部则保持更强的耦合。这项研究的结论强调了生态条件对水资源供应的重要性,并建议水资源管理必须了解当地的植被种类,特别是在地下水资源枯竭的情况下。
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Decoupling of Ecological and Hydrological Drought Conditions in the Limpopo River Basin Inferred from Groundwater Storage and NDVI Anomalies
Droughts are projected to increase in intensity and frequency with the rise of global mean temperatures. However, not all drought indices equally capture the variety of influences that each hydrologic component has on the duration and magnitude of a period of water deficit. While such indices often agree with one another due to precipitation being the major input, heterogeneous responses caused by groundwater recharge, soil moisture memory, and vegetation dynamics may lead to a decoupling of identifiable drought conditions. As a semi-arid basin, the Limpopo River Basin (LRB) is a severely water-stressed region associated with unique climate patterns that regularly affect hydrological extremes. In this study, we find that vegetation indices show no significant long-term trends (S-statistic 9; p-value 0.779), opposing that of the modeled groundwater anomalies (S-statistic -57; p-value 0.05) in the growing season for a period of 18 years (2004–2022). Although the Mann-Kendall time series statistics for NDVI and drought indices are non-significant when basin-averaged, spatial heterogeneity further reveals that such a decoupling trend between vegetation and groundwater anomalies is indeed significant (p-value < 0.05) in colluvial, low-land aquifers to the southeast, while they remain more coupled in the central-west LRB, where more bedrock aquifers dominate. The conclusions of this study highlight the importance of ecological conditions with respect to water availability and suggest that water management must be informed by local vegetation species, especially in the face of depleting groundwater resources.
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来源期刊
Hydrology
Hydrology Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
4.90
自引率
21.90%
发文量
192
审稿时长
6 weeks
期刊介绍: Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences, including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology, hydrogeology and hydrogeophysics. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, ecohydrology, geomorphology, soil science, instrumentation and remote sensing, data and information sciences, civil and environmental engineering are within scope. Social science perspectives on hydrological problems such as resource and ecological economics, sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site. Studies focused on urban hydrological issues are included.
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