River analysis simulation model for paddy field in saline soil: a case study in the lower Nam Kam River Basin, Thailand
2010
Chuenchooklin, S., Naresuan Univ., Phitsanulok, 650000 (Thailand). Dept. of Civil Engineering | Mekpruksawong, P., Royal Irrigation Dept., Bangkok, 10300 (Thailand). Project Planning Office | Ichikawa, T., Tokai Univ., Kumamoto, 862-8652 (Japan). School of Industrial Engineering | Sangchan, S., King Mongkut's Inst. of Technology, Ladkrabang, Bangkok, 10520 (Thailand)
A study on flood management in lower Nam Kam River Basin, a tributary of Mekong River Basin in Nakhon Phanom Province, was carried out. Although there have been some regulated structures in the upstream of the Nam Kam and the Nam Bang rivers (back stream of Nam Kam) which managed by the Royal Irrigation Department (RID) in recent years, however, the fluctuated water level in flood plain nearby the river mouth is easily influenced by backwater from the Mekong River and cause flood in flood plain area. Unfortunately, some sources that might cause surface and ground water contamination by some saline soil spots beneath the ground level were investigated by RID. The gate regulations for the proposed reservoir in the lower Nam Kam river should be well operated with awareness of the dispersion of saline water from those sources. The present research was conducted by analyzing flood delineations using the river analysis system model (HEC-RAS) for the estimation of main hydraulic parameters fo the Nam Kam River and would be applied to cases of without and with the regulated structures by proposed dam and reservoir. The results from the model fitted with the observation and recorded data of both river stages and electric conductivities (EC) of shallow wells nearby saline soil spots since 2005. This study is a part of research in sustainable conjunctive use of groundwater and surface water in saline soil with the aims for further management of operation of gates, reservoirs, and groundwater utilization to avoid salinity dispersion.
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