Horas Yosua, Muhammad Syahril Badri Kusuma, Joko Nugroho
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引用次数: 0
摘要
南雅加达是一个特大城市,直接受到土地利用覆盖变化(LUCC)的影响。所产生的影响之一就是城市洪水,也就是所谓的冲积洪水。需要开展更多工作来评估 LUCC 对南雅加达冲积洪水增加的影响。在本研究中,确定了 LUCC 导致的径流系数值 (C),并评估了冲积洪水的危害风险。分析使用 GIS 软件对 LUCC 进行线性回归分类,并根据公共工程部 2014 年第 12 号条例进行危害和风险分析。根据合理法排洪公式,C 值越高,流域内的流量越大。为简化计算,使用的 C 等值是代表流域的 C 值。南雅加达的径流系数(C)每年增长 1%-1.3%。研究发现,径流系数(C)的增长率与南雅加达的人口增长率相同,即每年约为 1.3%。径流系数的增加也增加了易受洪水侵袭地区的冲积洪水风险。此外,危害风险研究发现,有两个地方的危害风险指数处于中等水平,即 Ciledug Seskoal 和 Dharmawangsa Taman Gajah。这项研究可作为政府机构构建冲积洪水缓解空间优先次序框架的基础。
An assessment of pluvial hazard in South Jakarta based on land-use/cover change from 2016 to 2022
South Jakarta is a megapolitan city that is directly affected by Land Use Cover Change (LUCC). One of the impacts that arise is urban flooding, otherwise known as pluvial floods. More work is needed to evaluate the effect of LUCC on the increase of pluvial floods in South Jakarta. In this study, the runoff coefficient value (C) caused by LUCC is determined and the hazard risk of pluvial floods is evaluated. The analysis uses linear regression classification of LUCC using GIS software and carries out hazard and risk analysis based on Minister of Public Works Regulation Number 12 of 2014. Based on the rational method flood discharge formula, the higher C value result in the greater flow rate in a watershed. To simplify the calculation, the C equivalent value used is the C value that represent the watershed. The growth of the runoff coefficient (C) in South Jakarta is 1%–1.3% per year. It is found that the rate of increase in the runoff coefficient (C) is the same as the population growth rate of DKI Jakarta, which is around 1.3% per year. The increasing of runoff coefficient also increases the risk of pluvial flooding in locations that are prone to flooding. Furthermore, the hazard risk study found that there are 2 locations with a moderate level on the hazard risk index, namely, Ciledug Seskoal and Dharmawangsa Taman Gajah. This study can be used by government agencies as a basis to construct the spatial prioritization framework for pluvial flood mitigation.