Flood control and loss estimation for paddy field at midstream of Chao Phraya River Basin, Thailand

International Symposium on Geohazards and Geomechanics 2015

地球科学;生态环境科学

Cham, T.C.^1 ; Mitani, Y.^1

Graduate School of Civil and Structural Engineering, Kyushu University, Motooka 744, Fukuoka, Japan^1

关键词: 2D hydrodynamic models;    Actual conditions;    Chao phraya river basins;    Living conditions;    Loss estimation;    Post analysis;    Research focus;    Simulated results;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/26/1/012022/pdf
DOI  :  10.1088/1755-1315/26/1/012022

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

2011 Thailand flood has brought serious impact to downstream of Chao Phraya River Basin. The flood peak period started from August, 2011 to the end of October, 2011. This research focuses on midstream of Chao Phraya River Basin, which is Nakhon Sawan area includes confluence of Nan River and Yom River, also confluence of Ping River and Nan River. The main purpose of this research is to understand the flood generation, estimate the flood volume and loss of paddy field, also recommends applicable flood counter measurement to ease the flood condition at downstream of Chao Phraya River Basin. In order to understand the flood condition, post-analysis is conducted at Nakhon Sawan. The post-analysis consists of field survey to measure the flood marks remained and interview with residents to understand living condition during flood. The 2011 Thailand flood generation at midstream is simulated using coupling of 1D and 2D hydrodynamic model to understand the flood generation during flood peak period. It is calibrated and validated using flood marks measured and streamflow data received from Royal Irrigation Department (RID). Validation of results shows good agreement between simulated result and actual condition. Subsequently, 3 scenarios of flood control are simulated and Geographic Information System (GIS) is used to assess the spatial distribution of flood extent and reduction of loss estimation at paddy field. In addition, loss estimation for paddy field at midstream is evaluated using GIS with the calculated inundation depth. Results show the proposed flood control at midstream able to minimize 5% of the loss of paddy field in 26 provinces.