低洼地区农田淹没成因分析方法及应用－（I）数学模型验证及洪水特性分析

为探求从化市水南村部分农田被淹没的原因，本文分别采用现场调查、水文地形资料分析、数学模型、调洪演算等方法，对本次流溪河洪水和下游牛心岭电站对淹没位置河段水位的影响进行了分析和探讨。结果表明，洪水从大拗坝到达水南村淹没位置河道的时间约为2.6 h；从5月7日凌晨4点～12点，流溪河水位明显高于淹没区地形，极容易导致外江洪水从未封堵暗渠进入淹没区；牛心岭电站只用4个闸孔泄洪，在洪峰时刻引起淹没区外侧河道水位抬高约0.05 m左右。

The Method of Analyzing Reasons of Flooded Farmland in Low-lying Areas and its Application-(I) Verification of Mathematical Model and Analysis of Flood Charateristics

The effect of flood in Liuxi River and Niuxinling Power Station downstream on water levels of the reach at inundated area was researched to hunt for flooded reasons by the methods of field exploring, analysis of hydrological and terrain data, mathematical model and flood routing. It shows that there is about 2.6 h needed for flood reaching the reach at inundated area from Daao dam upstream. It’s very easy for flood in Liuxi River entering into inundated area between 4 AM to 12 AM on 7 May from a culvert unblocked for higher water level in the river. There was about 0.05 m backwater in the river at inundated area when there were only 4 gate holes for flood discharge with one closed at Niuxinling Power Station.