江门市区暴雨强度公式及计算图表

1、江门市暴雨强度公式及计算图表江门市水务局江门市气象局广东气候中心2015年12月说.1.本计算图基于新会国家气象台35年(1980-2014)的连续自记雨量记录，采用中国先进的“降水数字处理系统”获取高精度原始数据，采用年最大值法编制。2.表中列出了对应于重现期2、3、5、10、20、30、50和100(年)的单个重现期的暴雨强度公式。根据选定的设计重现期，可直接用表格值检查设计暴雨强度(单重现期暴雨强度公式见表1)。3.如果采用其他重现期，设计暴雨强度可按重现期的区间参数公式计算：式中：q-设计暴雨强度(升/秒公顷)t-降雨持续时间(分钟)降雨力b，n-局部常数(A、B、N根据重现期间隔参数

2、公式计算，如表2所示)4.考虑绘制全国城市暴雨强度公式等值线图，列出包括重现期在内的总暴雨强度公式：由于重现期总公式的精度不如区间参数公式，建议在其他重现期设计暴雨强度时采用区间参数公式。明用重现期区间参数公式计算暴雨强度的一个例子：求P=25年、t=50分钟的暴雨强度q。从重现期间隔参数公式二，我们得到：n=0.719 -0.078Lg(P - 4.527)=0.61635(取0.616)b=13.953 -4.138Lg(P - 6.185)=8.67943(取8.679)a=21.737-2.945千克(P - 6.737)=18.02166(取18.022)P=25年的暴雨强度计算公式

3、如下：1-200分钟任何时段的暴雨强度均可根据上述公式计算。当t=50时：=244.982 (l/s/ha)5.公式错误根据重现期为2-20年的暴雨强度公式计算的平均绝对均方差为0.025(mm/min)，平均相对均方差为1.97%。精度满足室外排水设计规范 (GB 50014-2006，2014版)的要求。表1单一重现期暴雨强度公式重现期p(年)公共类型P=24830.308/(t 17.044) 0.803P=34359.535/(t 15.633) 0.760P=53853.024/(t 13.926) 0.712P=103377.408/(t 11.547) 0.661P=203077

4、.977/(t 9.235) 0.626P=302957.904/(t 8.256) 0.609P=502825.473/(t 7.160) 0.589P=1002661.312/(t 5.792) 0.564表2重现期暴雨强度公式p(年)间隔参数公共类型1-10in0.827-0.180千克(P - 0.640)b18.799 -7.198Lg (P - 0.247)A29.900-10.903升(P - 0.771)10100二n0.719-0.078克(P - 4.527)b13.953 -4.138Lg (P - 6.185)A21.737-2.945千克(P - 6.737)江门市暴

5、雨强度曲线编写于2015年扩展样本数据后的降水和重现期图P=2(年)t:分钟。问：升/秒/公顷tqtqtqtqtqtqtq1473.30327231.17153159.27379123.609105101.97713187.32715776.6882453.24128227.04154157.47080122.585106101.31113286.85715876.3363434.99229223.07355155.71381121.580107100.65513386.39215975.9874418.31430219.25756153.99882120.594108100.00813485

6、.93216075.6425403.00731215.58557152.32683119.62510999.37013585.47816175.3016388.90332212.04858150.69484118.67311098.74113685.02916274.9637375.86033208.63959149.10185117.73811198.12213784.58616374.6298363.76134205.35060147.54586116.82011297.51113884.14716474.2979352.50235202.17661146.02587115.9181139

7、6.90813983.71416573.97010341.99736199.10962144.53988115.03111496.31414083.28616673.64511332.16937196.14663143.08889114.15911595.72814182.86216773.32312322.95438193.27964141.66890113.30211695.15014282.44416873.00513314.29339190.50565140.28091112.45911794.57914382.03016972.69014306.13840187.81866138.9

8、2292111.63011894.01614481.62017072.37815298.44241185.21667137.59393110.81511993.46114581.21617172.06816291.16842182.69268136.29294110.01312092.91314680.81517271.76217284.28043180.24569135.01995109.22312192.37214780.42017371.45918277.74744177.87070133.77296108.44712291.83814880.02817471.15819271.5434

9、5175.56571132.55097107.68312391.31114979.64117570.86020265.64146173.32572131.35498106.93012490.79115079.25817670.56621260.01947171.14873130.18199106.19012590.27715178.87917770.27322254.65848169.03274129.032100105.46112689.77015278.50417869.98423249.53849166.97475127.905101104.74312789.27015378.13317

10、969.69724244.64450164.97176126.800102104.03612888.77515477.76618069.41325239.96151163.02177125.716103103.33912988.28715577.40318169.13126235.47452161.12378124.653104102.65313087.80415677.04318268.852P=3(年)t:分钟。问：升/秒/公顷tqtqtqtqtqtqtq1514.63927251.67153175.25779137.293105114.16313198.42515786.9412492.

11、30328247.27554173.34180136.200106113.44913297.91815886.5603472.09029243.05355171.47281135.128107112.74513397.41715986.1844453.70230238.99556169.65082134.075108112.05213496.92116085.8105436.89131235.08957167.87283133.040109111.36813596.43216185.4416421.45532231.32958166.13784132.024110110.69313695.94

12、816285.0757407.22733227.70559164.44285131.026111110.02813795.47016384.7138394.06334224.21060162.78786130.045112109.37313894.99716484.3549381.84535220.83661161.17087129.081113108.72613994.53016583.99910370.47036217.57862159.59088128.133114108.08814094.06816683.64711359.84937214.42963158.04589127.2011

13、15107.45814193.61116783.29912349.90938211.38464156.53490126.285116106.83714293.16016882.95413340.58239208.43765155.05791125.384117106.22514392.71316982.61214331.81140205.58366153.61192124.498118105.62014492.27117082.27415323.54641202.81867152.19693123.626119105.02314591.83417181.93916315.74342200.13868150.81194122.768120104.43414691.40217281.60717308.3624319