辽宁铁岭市暴雨洪水规律研究

Study on the law of rainstorm and flood in Tieling City of Liaoning Province

以辽宁铁岭市为研究区,采用空间分析、线性分析、可变模糊聚类等方法,从暴雨、洪水、产汇流、综合特征等方面出发,系统识别暴雨洪水规律。研究结果表明,铁岭市最大24 h降雨量120~350 mm,暴雨日数8~21 d/10 a,大暴雨日数0.4~3.2 d/10 a,并由南向北、由西向东递减;洪水年最大值流量多呈衰减趋势;铁岭北部昌图县以超渗产流方式为主,其余各县(市)以蓄满产流方式为主;铁岭市整体处于辽宁省暴雨洪水易发区和少发区之间,昌图县处于暴雨洪水少发区,其余各县(市)多处于暴雨洪水易发区。研究结果以期为铁岭市防洪减灾工作提供支撑,对辽宁省乃至整个辽河流域防洪安全具有参考意义。

Taking Tieling City of Liaoning Province as the study area,the rainstorm and flood law is systematically identified from the four aspects of rainstorm,flood,runoff and confluence and comprehensive characteristics by using the methods of spatial analysis,linear analysis and variable fuzzy clustering.The results show that the maximum 24-hour rainfall in Tieling City is some 120~350 mm,the number of rainstorm days is 8~21 d/10a,and the number of heavy rainstorm days is 0.4~3.2 d/10a,which shows a decreasing trend from south to north and from west to east in Tieling City.The annual maximum discharge of flood tends to decline.Changtu County in the north of Tieling City is mainly in the mode of super infiltration runoff,and the other counties(cities)are mainly in the mode of full storage runoff.Tieling City as a whole is located between the prone area and the less prone area of rainstorms and floods in Liaoning Province.Changtu County is located in the less prone area of rainstorms and floods,and most of the other counties(cities)are located in the prone areas.The research results are expected to provide support for the flood control and disaster reduction of Tieling City,and also have reference significance for the flood security of Liaoning Province and even the whole Liaohe River Basin.