Flood hazard mapping and assessment in data-scarce Nyaungdon area, Myanmar


Autoři: Zaw Myo Khaing aff001;  Ke Zhang aff001;  Hisaya Sawano aff004;  Badri Bhakra Shrestha aff005;  Takahiro Sayama aff005;  Kazuhiro Nakamura aff006
Působiště autorů: State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering and College of Hydrology and Water Resources, Hohai University, Nanjing, Jiangsu Province, China aff001;  CMA-HHU Joint Laboratory for HydroMeteorological Studies, Hohai University, Nanjing, Jiangsu Province, China aff002;  Department of Meteorology and Hydrology, Ministry of Transport and Communications, Nay Pyi Taw, Myanmar aff003;  International Centre for Water Hazard and Risk Management, Tsukuba-shi, Ibaraki-Ken, Japan aff004;  Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto, Japan aff005;  Construction Technique Institute, Chuo-Ku, Tokyo, Japan aff006
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0224558

Souhrn

Torrential and long-lasting rainfall often causes long-duration floods in flat and lowland areas in data-scarce Nyaungdon Area of Myanmar, imposing large threats to local people and their livelihoods. As historical hydrological observations and surveys on the impact of floods are very limited, flood hazard assessment and mapping are still lacked in this region, making it hard to design and implement effective flood protection measures. This study mainly focuses on evaluating the predicative capability of a 2D coupled hydrology-inundation model, namely the Rainfall-Runoff-Inundation (RRI) model, using ground observations and satellite remote sensing, and applying the RRI model to produce a flood hazard map for hazard assessment in Nyaungdon Area. Topography, land cover, and precipitation are used to drive the RRI model to simulate the spatial extent of flooding. Satellite images from Moderate Resolution Imaging Spectroradiometer (MODIS) and the Phased Array type L-band Synthetic Aperture Radar-2 onboard Advanced Land Observing Satellite-2 (ALOS-2 ALOS-2/PALSAR-2) are used to validate the modeled potential inundation areas. Model validation through comparisons with the streamflow observations and satellite inundation images shows that the RRI model can realistically capture the flow processes (R2 ≥ 0.87; NSE ≥ 0.60) and associated inundated areas (success index ≥ 0.66) of the historical extreme events. The resultant flood hazard map clearly highlights the areas with high levels of risks and provides a valuable tool for the design and implementation of future flood control and mitigation measures.

Klíčová slova:

Flooding – Rain – Rivers – Simulation and modeling – Surface water – Topographic maps – Myanmar


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Článek vyšel v časopise

PLOS One


2019 Číslo 11