Flood Sedimentology for Future Floods Mitigation in North Luwu, Sulawesi, Indonesia

Q3 Engineering

Open Civil Engineering Journal Pub Date : 2023-04-01 DOI:10.28991/cej-2023-09-04-011

A. Maulana, M. Tumpu, Indah Putri Indriani, I. Utama

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引用次数: 1

Abstract

A sedimentological study after the flash floods that hit North Luwu on July 13, 2020, has been carried out on three affected rivers, namely the Masamba River, the Radda River, and the Binuang River. The study aims to determine the sedimentological impact of the 2020 flash flood disaster, including sedimentation rate, annual bedload sediment volume, and total sediments, which will be used as a reference for future mitigation consideration. The study is based on fieldwork for data collection and laboratory analysis. The results of field measurements and laboratory analysis are then processed by calculating the sedimentation rate at the annual discharge, the bedload sediment volume, and the total estimated sediment accumulated by the flash flood. Sedimentation rate analysis was performed using the Ackers-White formula, and flood delineation was processed using HEC-RAS software. The climatological data from the climatology station at Andi Djemma Airport were used to calculate the river discharge. It is estimated that the volume of bedload sediment in the Binuang River is 16,194,168 m3/year, that of the Masamba River is 7,852,061 m3/year, and that of the Radda River is 4,003,011 m3/year. The volume of sediment brought by flash flood sedimentation in the Radda River is 9,141,608.39 m3, while that in the Masamba River is 55,131,761.29 m3, and that in the Binuang River is 136,838,603.61 m3. The total estimated sedimentation generated by the flash flood on the three rivers on July 13, 2020, is 222,476,966 m3. Based on the study, zonation for vulnerability levels is designed for a future mitigation scheme. The zonation can be classified into three zones: 1) the highly affected zone; 2) the moderately affected zone; and 3) the least affected zone, with special purposes in each zone. It is strongly recommended that future disaster settlement and infrastructure reconstruction policies be based on this zone to reduce disaster risk. Doi: 10.28991/CEJ-2023-09-04-011 Full Text: PDF

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印尼苏拉威西岛北卢乌地区未来洪水缓解的洪水沉积学

2020年7月13日鲁武北部山洪暴发后，对马桑巴河、拉达河、比光河三条受影响河流进行了沉积学研究。该研究旨在确定2020年山洪灾害的沉积学影响，包括沉积速率、年床质泥沙体积和总沉积物，这将作为未来减灾考虑的参考。这项研究是基于实地工作的数据收集和实验室分析。现场测量和实验室分析的结果，然后通过计算年流量时的沉积速率、河床泥沙体积和估计的山洪累积的总泥沙来处理。沉降速率分析采用Ackers-White公式，洪水圈定采用HEC-RAS软件处理。利用Andi Djemma机场气象站的气象资料计算了河流流量。据估算，滨光河的河床泥沙量为16194168 m3/年，马桑巴河的河床泥沙量为7852061 m3/年，拉达河的河床泥沙量为4003011 m3/年。其中，拉达河、马桑巴河、碧光河分别带沙量9,141,608.39 m3、55131,761.29 m3、136,838,603.61 m3。2020年7月13日，三江山洪淤积总量估计为222,476,966 m3。在研究的基础上，为未来的缓解方案设计了脆弱性等级分区。该分区可分为3个分区:1)高影响区;2)中度影响区;3)受影响最小的区域，每个区域都有特殊用途。强烈建议未来的灾害解决和基础设施重建政策以该区域为基础，以减少灾害风险。Doi: 10.28991/CEJ-2023-09-04-011全文:PDF

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来源期刊

Open Civil Engineering Journal Engineering-Civil and Structural Engineering

CiteScore

1.90

自引率

0.00%

发文量

期刊介绍： The Open Civil Engineering Journal is an Open Access online journal which publishes research, reviews/mini-reviews, letter articles and guest edited single topic issues in all areas of civil engineering. The Open Civil Engineering Journal, a peer-reviewed journal, is an important and reliable source of current information on developments in civil engineering. The topics covered in the journal include (but not limited to) concrete structures, construction materials, structural mechanics, soil mechanics, foundation engineering, offshore geotechnics, water resources, hydraulics, horology, coastal engineering, river engineering, ocean modeling, fluid-solid-structure interactions, offshore engineering, marine structures, constructional management and other civil engineering relevant areas.