气候变化领域集成服务门户(CCPortal): A Model-Based Flood Hazard Mapping on the Southern Slope of Himalaya

CCPortal

DOI	10.3390/w12020540
	A Model-Based Flood Hazard Mapping on the Southern Slope of Himalaya
	Aryal, Dibit; Wang, Lei; Adhikari, Tirtha Raj; Zhou, Jing; Li, Xiuping; Shrestha, Maheswor; Wang, Yuanwei; Chen, Deliang
通讯作者	Wang, L (通讯作者)
发表日期	2020
EISSN	2073-4441
卷号	12 期号:2
英文摘要	Originating from the southern slope of Himalaya, the Karnali River poses a high flood risk at downstream regions during the monsoon season (June to September). This paper presents comprehensive hazard mapping and risk assessments in the downstream region of the Karnali River basin for different return-period floods, with the aid of the HEC-RAS (Hydrologic Engineering Center's River Analysis System). The assessment was conducted on a 38 km segment of the Karnali River from Chisapani to the Nepal India border. To perform hydrodynamic simulations, a long-term time series of instantaneous peak discharge records from the Chisapani gauging station was collected. Flooding conditions representing 2-, 5-, 10-, 50-, 100-, 200-, and 1000-year return periods (YRPs) were determined using Gumbel's distribution. With an estimated peak discharge of up to 29,910 m(3)/s and the flood depths up to 23 m in the 1000-YRP, the area vulnerable to flooding in the study domain extends into regions on both the east and west banks of the Karnali River. Such flooding in agricultural land poses a high risk to food security, which directly impacts on residents' livelihoods. Furthermore, the simulated flood in 2014 (equivalent to a 100-YRP) showed a high level of impact on physical infrastructure, affecting 51 schools, 14 health facilities, 2 bus-stops, and an airport. A total of 132 km of rural urban roads and 22 km of highways were inundated during the flood. In summary, this study can support in future planning and decision-making for improved water resources management and development of flood control plans on the southern slope of Himalaya.
关键词	HEC-RAS INUNDATION RIVER RISK GIS REGRESSION
英文关键词	flood frequency; hydrodynamic simulation; hazard mapping; risk assessment; Himalaya
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
WOS类目	Environmental Sciences ; Water Resources
WOS记录号	WOS:000519846500231
来源期刊	WATER
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259946
推荐引用方式 GB/T 7714	Aryal, Dibit,Wang, Lei,Adhikari, Tirtha Raj,et al. A Model-Based Flood Hazard Mapping on the Southern Slope of Himalaya[J]. 中国科学院青藏高原研究所,2020,12(2).
APA	Aryal, Dibit.,Wang, Lei.,Adhikari, Tirtha Raj.,Zhou, Jing.,Li, Xiuping.,...&Chen, Deliang.(2020).A Model-Based Flood Hazard Mapping on the Southern Slope of Himalaya.WATER,12(2).
MLA	Aryal, Dibit,et al."A Model-Based Flood Hazard Mapping on the Southern Slope of Himalaya".WATER 12.2(2020).