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Analysis of Meteorological Drought Resilience and Risk Assessment of Groundwater Using Signal Analysis Method

机译：信号分析方法分析气象干旱弹性及地下水风险评估

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摘要

Groundwater plays an important role in mitigating drought. It is necessary to analyze the spatiotemporal variation characteristics of groundwater and establish an appropriate assessment for the risk of drought for disaster prevention. This study developed a novel approach for the drought risk assessment system based on the Hilbert Huang Transform (HHT) method to understand the spatial distribution of the risk of drought in terms of groundwater. We analyzed drought vulnerability applying the HHT to analyze the variation characteristics of groundwater level spatiotemporally and the physical mechanism of groundwater factors to quantify groundwater sensitivity to the environment, and present the resilience of each region. Furthermore, the drought hazard was determined using the standardized precipitation index and the dynamic drought intensity gave the durability characteristics of each region. The drought exposure was also investigated, which quantifies the water demand to satisfy people's livelihoods for a certain population density. Based on the framework proposed in this study, an overall risk map of droughts in the Pingtung Plain was obtained. This study effectively classified the main time-frequency characteristics, the availability of groundwater, and the risk of drought in each region. A total of 11 of the 45 groundwater monitoring stations are located at the highest risk of level 5, most of which are located in the coastal area of Gaoping River and Linbian River. Over-pumping should be avoided in these areas. On the contrary, the alluvial fan area showed the lowest groundwater risk of drought. The results can be adopted for water management, drought resilience, sustainable development of groundwater resources, and decision making in determining drought risk.
机译：地下水在缓解干旱方面发挥着重要作用。有必要分析地下水的时空变化特性，并对防治防灾风险建立适当的评估。本研究开发了一种基于希尔伯特黄变换（HHT）方法的干旱风险评估系统的新方法，了解地下水方面干旱风险的空间分布。我们分析了利用HHT的干旱脆弱性，分析地下水位时尚的变化特性以及地下水因素的物理机制来量化对环境的地下水敏感性，并呈现每个地区的弹性。此外，使用标准化沉淀指数测定干旱危害，并且动态干旱强度给出了每个区域的耐久性特征。还调查了干旱暴露，这些暴露量量化了需求，以满足人们为某种人口密度的生计。基于本研究提出的框架，获得了平坦平原干旱的总体风险地图。本研究有效地分类了主要时间频特性，地下水的可用性以及每个地区干旱的风险。 45个地下水监测站共有11个位于5级的最高风险，其中大部分位于高山河和临银河沿海地区。在这些区域应该避免过度泵送。相反，冲积扇区显示出干旱地下水的最低风险。结果可用于水管理，干旱弹性，地下水资源可持续发展，决策制定策划风险。

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