Increase Methods of Drainage Discharge of Inundated Water in Low Flat Land Considering Bed Deformation Characteristics (PAP014424)

Código

PAP014424

Autores

HIROSHI TAKEBAYASHI, Sornthep Vannarat, Saifhon Tomkratoke

Tema

Urban Floods

Resumo

Drainage characteristics of inundated water on the lower Chao Phraya River in Thailand isintroduced. Furthermore, drainage methods of inundated water on low flat land areas have beendiscussed by use of the results of horizontal two dimensional bed deformation analysis. Installation ofshortcut channel in a fully developed meandering channel can decrease the water surface elevation in theupstream area of the shortcut channel. However, water surface level increases in the downstream area ofthe shortcut channel and risk of inundation increases there. Most of the confluences between the ChaoPhraya River and irrigation channels are located along the outer bank. However, water surface levelalong the outer bank is higher than that along the inner bank during floods. As a result, drainagedischarge of inundated water from the irrigation channel to a main channel will increase, if theconfluences between the main flow and irrigation channels are located along the inner bank. Furthermore,a groin at the upstream of the confluences can decrease the water surface level there. As a result,drainage discharge of inundated water from the irrigation channel to the main channel increases.