Application Study on Effect of Flood Storage in Paddy Field and Pump Discharge by Diffusive Tank Model

• Main Authors: Yin-Sheng Huang, 黃因勝
• Other Authors: Rong-Song Chen
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/70050419779836546485

碩士 === 國立中興大學 === 土木工程學系所 === 102 === In recent years the impact of climate change torrential rain and a rapid return period of a hundred years of rainfall events. To prevent downstream low-lying area from flooding, often in the downstream constructed pumping station in order to facilitate the smooth discharge of water. In this study added to water pumping stations and gates in tank model for downstream of the pumping station and the gate to investigate the effect of drainage channels and analysis and the use of downstream discharge to investigate the effect of paddy detention. Also provide drainage for future reference design planning. The study selected Luliao agricultural land in Yunlin as the target area. And the use of tank model test area downstream of the gate with a drainage system and pumps the simulation model to explore and paddy flood storage capacity. When use inside water level of the boundary conditions, eight rainfall events, midstream peak depth verification point average error of about 18.5%. At the two rainfall events, the use outside water level of the boundary conditions at the middle reaches peak depth verification point average error of about 19.9%, lower verification point error of 8.2%. At the same rainfall event, each were used inside water level and outside water level of the boundary conditions for the next case, a decreasing trend in peak depth error midstream verification point display mode has a certain accuracy. If you change the different cultivation types, the time to reach peak depth of the midstream delay lasts one hour and downstream delay lasts three hours, the peak water depth in the middle reaches of the whole paddy lasts reduces 0.4 m, downstream of about 0.3 m. Flood peak flow quantity as to the basis of the all paddy field, explore peak before the total volume of the difference, per unit area of paddy fields that cuts more about 852 (m^3/ha), equivalent water depth of 8.52 cm. When the capacity of design theory to explore the use of detention, the reduction of paddy per unit area of about 2155 (m^3/ha), equivalent water depth of 21.6 cm. Therefore, the paddy field had certain effect on flood regulation for the drainage systems of lower reaches area, so it could decrease the load of the drainage in the area and prevent the residents from the danger of flood.