设计洪峰流量公式推理

计算河道比降 工程 路基工程安全技术交底工程项目施工成本控制工程量增项单年度零星工程技术标正投影法基本原理 名称：罗家坝一、至坝址断面处1、流域面积F(平方公里)89.102、河道主流长度L(公里)23.043、河道平均坡度量算 表 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf 编号高程高差(hn-1+hn)各河段长Ln累积河长(hn-1+hn)Lnmmmkmkmm.km1249000.000.000227526261.991.9951.74331061871.763.75153.1243501011621.585.33255.9654001512521.336.66334.65664251763270.827.48267.81374752264021.699.17680.18485503015272.0211.191066.12196504017021.8413.031293.084107004518521.6714.701419.4321180055110021.5916.291596.1861287562611771.0017.301180.5311395070113271.3018.601726.42714102577614771.0019.601475.52315115090116771.4921.082490.34516122597618770.7121.791330.793171300105120270.5422.331096.607181425117622270.3422.67763.861191475122624020.1822.86434.762201559.31310.32536.30.1823.04466.67922122363738394041424344454647484950合计18083.82424、平均坡度J(‰)34.07基本公式洪峰流量公式　Qm=0.278ΨSpF/τn对于小型水利工程，集雨面积较小，可以认为 设计 领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计 暴雨的历时t都大于流域汇流时间，属全面汇流情况，而设计暴雨中参与形成洪峰流量流量的只是其中雨强最大，历时为τ的那部分成峰暴雨，因τ值较小，一般可假定成峰暴雨的雨强在时间和地区分布上都是均匀的。这样，可以不考虑设计暴雨的点面雨量的折算和雨型分配问题，只要求出流域中心处符合设计频率在一定历时内的平均雨强就可以了。计算步骤：式中Qm为设计洪峰流量1、在E17、E18、E20输入数值，可点击左边的链接查找。Ψ为洪峰径流系数Sp为最大一小时雨量n为暴雨指数，广西地区n2=0.6-0.72、点F22输入频率。Sp=H24p/241-n23、选择输入F6的值式中H24p为设计频率的24小时暴雨量τ为集流时间F为集雨面积4、点“解方程”按钮，完成洪水计算。τ=τ0Ψ1/4-n2项目单位计算公式数值白色的请输入数值0.001流域面积Fkm289.1010.01河流长度Lkm23.0390.10河道平均坡降J0.034070.20暴雨递减指数n0.67100年一遇10年一遇0.33流域中心最大24暴雨量H24mm95.524小时暴雨等值图0.50一计算Sp值1.001最大24降雨量变差系数Cv值0.3824降雨量变差系数2.002偏差系数CsCs=3.5Cv1.333.003离均系数Φ2.6822请在左边输入频率5.0044暴雨均值H24mmH24＝H24(ΦCv+1)192.8310.0055雨力SpmmSp=H24/241-n267.56式中20.006二计算u值50.00071径流系数α0.775广西中小河流设计洪水计算方法研究　P4560.0002设计暴雨的径流深hRmmhR=αH24p149.52170.0003损失系数u值1.971水保水文　P11380.000三确定汇流系数m0.90256汇流参数查用表6四计算τ0小时4.384广西中小河流设计洪水计算方法研究　P45五联立τ=τ0Ψ-1/4-n小时3.380汇流时间Ψ＝1-u/Sp*τn求解0.934六洪峰流量值Qm=0.278ΨSpF/τn691.237七设计洪水总量万m3Wp=0.1αH24pF1332.246八总历时ThT=Wp/1800Qm10.707洪水总历时九概化三角形过程线时间流量原点0000洪峰0.25T3.00691.24Qm终点T11.00003.3799273931.094905814罗家坝水位库容曲线表序号高程面积库容累计库容m万m2万m3万m3123100.00000.000022320.080.04000.040032330.340.21000.250042341.220.78001.030052351.451.33502.365062361.691.57003.935072371.931.81005.745082382.162.04507.790092392.422.290010.0800101112131415161718192021222324252627282930特征参数说明水位m库容万m3对于小型水库，只需求出最大下泄流量及调洪库容，而无需推求下泄流量过程线，在这种情况下，可以采用概化三角形法进行调洪计算。其基本假定：入库洪水过程线可以概化为三角形，下泄流量过程线的上涨段也能近似地简化为直线。死水位231正常水位235.803.6210溢洪道宽B8mQm691.24T11W3801.80堰流系数1.6库水位Z(m)235.8236.8237.8238.8堰顶水头H(m)0123泄流能力q(m3/s)012.836.266.5库容V(万m3)3.6215.3837.3819.622假定q值38.41m3/s库容V3590.57万m3查表得q值24815.29m3/s-24776.88158堰顶水头H1.73m坝前水深6.53风速20.00吹程0.22上游坡角2.4波浪爬高0.452坝高1237.982设计状况波浪爬高坝高1安全超高坝高设计坝高m设计0.306237.7860.5238.336239.087校核0.452238.3220.3239.074序号汇流参数m查用表流域河道情况m11030904雨量丰沛的山区，原始森林覆盖率达70%以上，枯枝落叶层厚，壤中丰富，河床为大卵石、大砾石，有跌水。0.20.30.350.4南方植被好南方植被一般南方植被40-50%北方半干旱5南方、东北山丘，以灌木林、竹林为主的石山区或森林覆盖率达40－50%或流域内以水稻田或优良草皮为主，河床多砾石卵石，两岸滩地杂草丛生。0.20.40.50.6645676南北方地理景观过渡区、植被一般，以稀疏林、针叶林、幼林为主的石山丘或流域内耕地较多。0.60.70.80.957北方半干旱地区、植被差，以荒草坡、梯田或少量的稀疏林为主的土石山丘，旱作物较多，河道呈宽浅型。11.31.61.8注：表中θ＝L/j1/371m=0.16θ0.461.14根据湖南省北纬28度以南的公式0.9025皮尔逊Ш型曲线的离均系数Ф值表（部份）CsP%0.0010.010.100.200.330.501.002.003.005.0010.0020.0050.00060.00070.00080.0000.004.263.723.092.882.712.582.332.051.881.641.280.840.000-0.250-0.520-0.8401.330.104.563.943.233.002.822.672.402.111.921.671.290.840.020-0.270-0.530-0.85020.204.864.163.383.122.922.762.472.161.961.701.300.830.030-0.280-0.550-0.8500.305.164.383.523.243.032.862.542.212.001.731.310.820.050-0.300-0.560-0.85000.405.474.613.673.363.142.962.622.262.041.751.320.820.070-0.310-0.570-0.8500.505.784.833.813.483.253.042.682.312.081.771.320.810.080-0.330-0.580-0.8500.606.095.053.963.603.353.132.752.352.121.801.330.800.100-0.340-0.590-0.8502.682210.706.405.284.103.723.453.222.822.402.151.821.330.790.120-0.360-0.600-0.8500.806.715.504.243.853.553.312.892.452.181.841.340.780.130-0.370-0.600-0.8500.907.025.734.393.973.653.402.962.502.221.861.340.770.150-0.380-0.610-0.8501.007.335.964.534.093.763.493.022.542.251.881.340.760.160-0.390-0.620-0.8501.107.656.184.674.203.863.583.092.582.281.891.340.740.180-0.410-0.620-0.8501.207.976.414.814.323.953.663.152.622.311.911.340.730.190-0.420-0.630-0.8401.308.296.644.954.444.053.743.212.672.341.921.340.720.210-0.430-0.630-0.8401.408.616.875.094.564.153.833.272.712.371.941.330.710.220-0.440-0.640-0.8301.508.937.095.234.684.243.913.332.742.391.951.330.690.240-0.450-0.640-0.8201.609.257.315.374.804.343.993.392.782.421.961.330.680.250-0.460-0.640-0.8101.709.577.545.504.914.434.073.442.822.441.971.320.660.270-0.470-0.640-0.8101.809.897.765.645.014.524.153.502.852.461.981.320.640.280-0.480-0.640-0.8001.9010.207.985.775.124.614.233.552.882.491.991.310.630.290-0.480-0.640-0.7902.0010.518.215.915.224.704.303.612.912.512.001.300.610.310-0.490-0.640-0.7802.1010.838.436.045.334.794.373.662.932.532.001.290.590.320-0.490-0.640-0.7602.2011.148.656.175.434.884.443.712.962.552.001.280.570.330-0.500-0.640-0.7502.3011.458.876.305.534.974.513.762.992.562.001.270.550.340-0.500-0.640-0.7402.4011.769.086.425.635.054.583.813.022.572.011.260.540.350-0.510-0.630-0.7202.5012.079.306.555.735.134.653.853.042.592.011.250.520.360-0.510-0.630-0.7102.6012.389.516.675.825.204.723.893.062.602.011.230.500.370-0.510-0.620-0.7002.7012.699.726.795.925.284.783.933.092.612.011.220.480.370-0.510-0.610-0.6802.8013.009.936.916.015.364.843.973.112.622.011.210.460.380-0.510-0.610-0.6702.9013.3110.147.036.105.444.904.013.132.632.011.200.440.390-0.510-0.600-0.6603.0013.6110.357.156.205.514.964.053.152.642.001.180.420.390-0.510-0.590-0.6403.1013.9210.567.266.305.595.024.083.172.642.001.160.400.400-0.510-0.580-0.6203.2014.2210.777.386.395.665.084.123.192.652.001.140.380.400-0.510-0.570-0.6103.3014.5210.977.496.485.745.144.153.212.651.991.120.360.400-0.500-0.560-0.5903.4014.8111.177.606.565.805.204.183.222.651.981.110.340.410-0.500-0.550-0.5803.5015.1111.377.726.655.865.254.223.232.651.971.090.320.410-0.500-0.540-0.5603.6015.4111.577.836.735.935.304.253.242.661.961.080.300.410-0.490-0.530-0.5503.7015.7011.777.946.815.995.354.283.252.661.951.060.280.420-0.480-0.520-0.5353.8016.0011.978.056.896.055.404.313.262.661.941.040.260.420-0.480-0.510-0.5223.9016.2912.168.156.976.115.454.343.272.661.931.020.240.410-0.470-0.500-0.5104.0016.5812.368.257.056.185.504.373.272.661.921.000.230.410-0.460-0.490-0.4984.1016.8712.558.357.136.245.544.393.282.661.910.980.210.410-0.460-0.480-0.4864.2017.1612.748.457.216.305.594.413.292.651.900.960.190.410-0.450-0.470-0.4754.3017.4412.938.557.296.365.634.443.292.651.880.940.170.410-0.440-0.460-0.4644.4017.7213.128.657.366.415.684.463.302.651.870.920.160.400-0.440-0.450-0.4544.5018.0113.308.757.436.465.724.483.302.641.850.900.140.400-0.430-0.440-0.4444.6018.2913.498.857.506.525.764.503.302.631.840.880.130.400-0.420-0.430-0.4354.7018.5713.678.957.566.575.804.523.302.621.820.860.110.390-0.420-0.420-0.4264.8018.8513.859.047.636.635.844.543.302.611.820.840.090.390-0.410-0.410-0.4174.9019.1314.049.137.706.685.884.553.302.601.780.820.080.380-0.400-0.400-0.4085.0019.4114.229.227.776.735.924.573.302.601.770.800.060.379-0.395-0.399-0.4005.1019.6814.409.317.846.785.954.583.302.591.750.780.050.374-0.387-0.391-0.3925.2019.9514.579.407.906.835.994.593.302.581.730.760.03-0.369-0.380-0.384-0.3855.3020.2214.929.497.966.876.024.603.302.571.720.740.02-0.363-0.373-0.376-0.3775.4020.4614.929.578.026.916.054.623.292.561.700.720.00-0.358-0.366-0.369-0.3705.5020.7615.109.668.086.966.084.633.282.551.680.70-0.01-0.3530.360-0.363-0.3645.6021.0315.279.748.147.006.114.643.282.531.660.67-0.03-0.349-0.355-0.356-0.3575.7021.3115.459.828.217.046.144.653.272.521.650.65-0.04-0.341-0.349-0.3500.3515.8021.5815.629.918.277.086.174.673.272.511.630.63-0.05-0.339-0.344-0.345-0.3455.9021.8415.789.998.327.126.204.683.262.491.610.61-0.06-0.334-0.338-0.339-0.3396.0022.1015.9410.078.387.156.234.683.252.481.590.59-0.07-0.329-0.333-0.333-0.3336.1022.3716.1110.158.437.196.264.693.242.461.570.57-0.08-0.325-0.328-0.328-0.3286.2022.6316.2810.228.497.236.284.703.232.451.550.55-0.09-0.320-0.322-0.323-0.3236.3022.8916.4510.308.547.266.304.703.222.431.530.53-0.10-0.315-0.317-0.317-0.3176.4023.1516.6110.388.607.306.324.713.212.411.510.51-0.11-0.311-0.312-0.313-0.313