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Hydrological Drought across Peninsular Malaysia: Implication of drought index
Natural Hazards and Earth System Sciences ( IF 4.6 ) Pub Date : 2021-06-17 , DOI: 10.5194/nhess-2021-176
Hasrul Hazman Hasan , Siti Fatin Mohd Razali , Nur Shazwani Muhammad , Asmadi Ahmad

Abstract. Drought is considered a damaging natural disaster for economic, societal, and ecological impacts. The challenge of drought is to determine the drought characteristics, frequency, duration and severity, vital for drought's impact control and mitigation strategies. This paper adopts the spatial pattern of Streamflow Drought Index (SDI) for three, six, nine and twelve months for the tropical climate at Peninsular Malaysia. About 40 years of daily streamflow data based on 42 hydrological discharge stations were analyzed to obtain these indices. The area under drought stress during the study period at different time scales is stable and approximately 24 % of the total area. The years 1997–1999, 2002 and 2016–2018 mark the most critical drought years, with more than 48 % of the entire basin area under hydrological drought. According to the spatial evaluation of drought characteristics, short-term droughts are frequent in most regions, with relatively high severity and frequency in Northeast and Southeast of Peninsular Malaysia, where the maximum frequency reached 35.7 % and 42.8 %, respectively. This outcome emphasizes the importance and necessity of the basin's drought action strategies. Early detection of a probable hydrological drought can improve in the implementation of drought prevention or mitigation strategies.

中文翻译:

马来西亚半岛水文干旱:干旱指数的影响

摘要。干旱被认为是一种破坏性的自然灾害,会对经济、社会和生态产生影响。干旱面临的挑战是确定干旱特征、频率、持续时间和严重程度,这对干旱的影响控制和缓解战略至关重要。本文采用了马来西亚半岛热带气候三个月、六个月、九个月和十二个月的径流干旱指数(SDI)的空间格局。对基于 42 个水文排放站的大约 40 年的日流量数据进行了分析,以获得这些指标。研究期间不同时间尺度干旱胁迫面积稳定,约占总面积的24%。1997-1999年、2002年和2016-2018年是干旱最严重的年份,全流域48%以上的面积处于水文干旱状态。根据干旱特征的空间评价,短期干旱在大部分地区频繁发生,马来西亚半岛东北部和东南部的严重程度和频率较高,最高频率分别达到35.7%和42.8%。这一成果强调了流域干旱行动战略的重要性和必要性。及早发现可能的水文干旱可以改善干旱预防或缓解战略的实施。
更新日期:2021-06-17
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