南城县桐埠河流域山洪危险区洪水重现期研究

The research of the flood return period in mountain flood areas of the Tongbu River of Nancheng county

洪水调查是山洪灾害防治的基础,为山洪灾害系统防治工程建设提供重要的数据支撑.基于南城县桐埠河流域山洪危险区的实地调查,以流域内龙湖镇连塘村作为研究对象,通过实测河道断面资料,推求水位流量关系,确定洪痕位置对应的洪峰流量;由瞬时单位线法推求的不同频率下的洪峰流量得出研究对象的洪水重现期,以掌握该防治区发生的历史洪水量级及洪灾发生危险,为划分山洪灾害预警指标和风险评估提供基础数据.对类似山洪危险区域洪水重现期的分析确定具有参考意义.

Flood investigation is the basis of flood prevention and control,that provides important data support for the mountain flood disaster prevention and control project construction. Based on the field investigation of the flood area in the Tongbu River of Nancheng county,we take the Liantang village of Longhu town as the research object. Through the data of the measured river section,we obtained the relationship between water level and flow,then we can determine the peak flow of the floodmark position. The peak flow at different frequencies is obtained by the instantaneous unit hydrograph method,and then we can obtain the flood return period of the research object. It will help to grasp the historical flood magnitude and flood risk,and provide basic data for warning index and risk assessment of mountain flood disaster. It is of reference significance to the analysis and determination of the flood recurrence period in similar mountain flood areas.