茂名市中心城区暴雨强度公式及计算图表.docx

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1、茂名市中心城区暴雨强度公式及计算图表广东省气象防灾技术服务中心二零一六年十一月应用重现期区间参数公式计算暴雨强度实例:求P=25年,t=50min的暴雨强度q。从重现期区间参数公式II,得：n=0.549-0.002Ln(P-5.080)=0.543017(取0.543)b=3.499+0.369Ln(P-3.975)=4.622868(取4.623)A=Il.3411.161Ln(P-2.870)=14.93654(取14.937)配得P=25年的暴雨强度计算公式如下：167x14,937(f+4.623严3可按上式计算118Onlin中任何时段的暴雨强度。当t=50：=284. 174L(

2、s hm2)167x14.937(50+4.623)05435.公式误差重现期220年的暴雨强度公式算得的平均绝对均方差为：0.041(mmmin),平均相对均方差为：2.38%0精度符合室外排水设计规范(GB500142006,2014年版)提出的要求。1 .本计算图表以茂名国家气象观测站35年（19802014年）连续自记雨量记录为基础，利用国内先进的“降水数字化处理系统”得到高精度的原始数据，采用年最大值法进行编制。2 .以重现期2、3、5、1020、30、50、100（年）相应的单一重现期暴雨强度公式制表。设计暴雨强度可按选定设计重现期直接查用表列数值（单一重现期暴雨强度公式见表一）o

3、3 .若采用其它重现期，设计暴雨强度可用重现期区间参数公式计算：167q=+）式中：q设计暴雨强度L（sh112）t降雨历时（Inin）A一雨力b、n一地方常数（A、b、n按重现期区间参数公式计算，公式见表二）4 .考虑到绘制全国城市暴雨强度公式等值线图，列出包含重现期在内的暴雨强度总公式：1861.341X（1+0.360LgP）q+5.590严67因总公式精度不及重现期区间参数公式，故建议推求其它重现期设计暴雨强度时使用区间参数公式。表二重现期区间暴雨强度公式P（年）区间参数公式110In0.601-0.030Ln(P-0.836)b5.053-0.618Ln(P-0.771)A12.35

4、6+0.395Ln(P+0.154)10100IIn0.549-0.002Ln(P-5.080)b3.499+0.369Ln(P-3.975)A11.341+1.161Ln(P-2.870)表一单一重现期暴雨强度公式重现期P（年）公式P=22114.053/(t+4.926)0596P=32139.27/(t+4.558)0,578P=52171.668/(t+4.162)-558P=IO2274.874/(t+4.162)0546P=202444.713/(t+4.523)0544P=302533.891/(t+4.702)0543P=402594.679/(t+4.822)0542P=50

5、2640.938/(t+4.912)-541P=602678.346/(t+4.985)0541P=702709.575/(t+5.045)圳P=802736.462/(t+5.097)054P=902760.176/(t+5.143)0540P=1002781.218/(t+5.183)国翻册h（抑I）延长样本资料后的降水量与重现期曲线图三(5)P=2(年)t：min；q：L/(shm2)tqtqtqtqtqtqtq1732.06527268.31553188.12479150.825105128.416131113.153157101.9442667.09628263.42854186.2

6、148()149.764106127.725132112.66()158101.5713615.57329258.77355184.35681148.723107127.044133112.173159101.2014573.4883025433156182.54682147.701108126.372134111.691160100.8355538.31731250.08857180.78483146.697109125.710135111.214161100.4726508.38532246.02958179.06684145.712110125.057136110.743162100.1

7、137482.53133242.14259177.39185144.744111124.413137110.27816399.7588459.92134238.41560175.75886143.793112123.777138109.81716499.4059439.94235234.83761174.16487142.859113123.151139109.36216599.05610422.12936231.40062172.60888141.940114122.532140108.91116698.71011406.12637228.09563171.08989141.03811512

8、1.922141108.46616798.36812391.64938224.91364169.60590140.150116121.320142108.02516898.02813378.47739221.84765168.15691139.278117120.726143107.58916997.69214366.42840218.89166166.73892138.420118120.140144107.15817097.35915355.35441216.03767165.35393137.575119119.561145106.73217197.02816345.13342213.2

9、8268163.99894136.745120118.990146106.31017296.70117335.66343210.61869162.67295135.928121118.426147105.89217396.37718326.85944208.04270161.37496135.123122117.869148105.47917496.05619318.64745205.54871160.10497134.332123117.319149105.07017595.73720310.96546203.13372158.86198133.552124116.776150104.665

10、17695.42121303.75947200.79273157.64299132.785125116.239151104.26417795.10822296.98448198.52274156.449100132.029126115.709152103.86817894.79823290.59949196.32075155.279101131.285127115.186153103.47517994.49124284.56950194.18276154.133102130.552128114.669154103.08718()94.18625278.86351192.10577153.009

11、103129.829129114.157155102.70218193.88326273.45352190.08678151.906104129.118130113.652156102.32118293.584P=3(年)t：min；q：L/(shm2)tqtqtqtqtqtqtq1793.78527290.92553205.55379165.713105141.694131125.284157113.2012721.39328285.72654203.5178()164.577106140.952132124.753158112.7983664.57929280.77355201.53581

12、163.463107140.220133124.228159112.3994618.52130276.04856199.60582162.369108139.499134123.709160112.0045580.24831271.53457197.72483161.294109138.787135123.196161111.6126547.81732267.21658195.89184160.239110138.086136122.689162111.2257519.90033263.08059194.10385159.202111137.394137122.187163110.8408495.55234259.11460192.36086158.184112136.711138121.691164110.4609474.08535255.30