水庫(kù)設(shè)計(jì)洪水工程水文學(xué)課程設(shè)計(jì)報(bào)告書

/水文學(xué)課程設(shè)計(jì)課程名稱：工程水文學(xué)題目：陂下水庫(kù)設(shè)計(jì)洪水學(xué)院：土木工程系：水利水電與港口工程專業(yè)：水利水電工程班級(jí)：2012級(jí)學(xué)號(hào)：學(xué)生姓名：起訖日期：201~201指導(dǎo)教師：職稱：高工二O一四年六月目錄第1章基本資料………………11.1工程概況…………………11.2設(shè)計(jì)資料………………1第2章設(shè)計(jì)要點(diǎn)……………32.1設(shè)計(jì)標(biāo)準(zhǔn)…………………32.2確定流域參數(shù)……………32.3設(shè)計(jì)暴雨…………………32.4損失參數(shù)…………………112.5匯流參數(shù)…………………112.6設(shè)計(jì)洪峰流量推求………112.7設(shè)計(jì)洪水過程線…………13第3章設(shè)計(jì)成果……………18第4章成果合理性分析……………………19附錄………………20第1章基本資料1.1工程概況1.1.1水庫(kù)概況陂下水庫(kù)位于XX省長(zhǎng)汀縣四都鄉(xiāng).與XX省毗鄰。壩址位于汀江支流濯田河的小支流陂下河上。濯田河水力資源豐富.經(jīng)流域規(guī)劃.提出水力發(fā)電四級(jí)開發(fā)方案.陂下水庫(kù)為一級(jí)龍頭水庫(kù)。根據(jù)地形、地質(zhì)條件.總庫(kù)容初估約為5000~6000萬(wàn)m3.屬中型水庫(kù).裝機(jī)容量5000kW左右.屬小型電站。水工建筑物為三級(jí)建筑物.大壩為砌石壩。1.1.2流域概況陂下水庫(kù)壩址以上流域面積166km2.流域?yàn)樯角饏^(qū).平均高度500m.主河長(zhǎng)30．4km.主河道平均比降7．82‰。流域內(nèi)植被良好.土壤以紅壤土為主。流域內(nèi)雨量豐沛.多年平均降雨量1617．5mm.主要集中在四~九月.其中四~六月份以鋒面雨為主.七~九月份以臺(tái)風(fēng)雨為主。流域內(nèi)多年平均徑流深981mm.多年平均陸面蒸發(fā)量636．5mm.多年平均水面蒸發(fā)量990mm。1.2設(shè)計(jì)資料1.2.1資料概況陂下水庫(kù)壩址處無實(shí)測(cè)流量資料.流域內(nèi)也無實(shí)測(cè)雨量資料。壩址下游約1km處有四都雨量站.具有1956~1975年實(shí)測(cè)降雨系列。陂下河1973年5月31日發(fā)生過一場(chǎng)特大暴雨.四都站實(shí)測(cè)最大一日雨量332．5mm.經(jīng)調(diào)查.重現(xiàn)期約為80~100年。流域附近有觀音橋、官莊、上杭、桃溪、楊家坊水文站及長(zhǎng)汀、新橋、鐵長(zhǎng)、庵杰、四都、濯田等雨量站。資料情況見表1。其它資料：水利水電工程設(shè)計(jì)洪水計(jì)算手冊(cè).XX省水文手冊(cè)、XX地區(qū)簡(jiǎn)易水文手冊(cè)、XX地區(qū)水文圖集。1.2.2設(shè)計(jì)資料1．各水文站站有關(guān)資料年限統(tǒng)計(jì)表.見表1。2.暴雨資料長(zhǎng)汀、四都、濯田站實(shí)測(cè)短歷時(shí)暴雨資料.見表2。3.XX省暴雨點(diǎn)~面折算關(guān)系.見表3。4.XX省設(shè)計(jì)暴雨時(shí)程分配.見表4。5.XX省次暴雨強(qiáng)度和損失參數(shù)μ關(guān)系.見表5。6.降雨歷時(shí)等于24小時(shí)的徑流系數(shù)α值表.見表6。7.XX省匯流參數(shù)m經(jīng)驗(yàn)公式.見表7。8.匯流參數(shù)m值查用表.見表8。9.XX省24h暴雨洪水概化過程線系數(shù)表.見表9。10.XX省XX市和XX省XX市部分水文站洪峰流量分析成果表.見表10。第2章設(shè)計(jì)要點(diǎn)2.1設(shè)計(jì)標(biāo)準(zhǔn)根據(jù)工程規(guī)模確定設(shè)計(jì)洪水標(biāo)準(zhǔn).包括設(shè)計(jì)洪水標(biāo)準(zhǔn)和校核洪水標(biāo)準(zhǔn)。該水庫(kù)為三級(jí)建筑物.大壩為砌石壩.設(shè)計(jì)標(biāo)準(zhǔn)為50年一遇.校核標(biāo)準(zhǔn)為500年一遇。2.2確定流域參數(shù)根據(jù)萬(wàn)分之一地形圖.壩址以上集水面積F為166km2.主河道長(zhǎng)度L為30.4km.主河道河底比降為7.83‰。2.3設(shè)計(jì)暴雨2.3.1暴雨遞減指數(shù)根據(jù)長(zhǎng)汀雨量站各種歷時(shí)T=3h、6h、12h、24h實(shí)測(cè)最大雨量系列進(jìn)行頻率分析.其中1966年暴雨可以認(rèn)為是1936年以來最大。求出P=0.2%.1%.2%.10%.20%設(shè)計(jì)雨量.并化為降雨強(qiáng)度.在雙對(duì)數(shù)紙上點(diǎn)繪T和關(guān)系.并圖解出暴雨遞減指數(shù)。表2-1長(zhǎng)汀3h降雨量經(jīng)驗(yàn)頻率成果表序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%1154.42.41150.152.4295.59.51250.157.1364.114.31347.961.9463.419.01446.566.755723.81545.471.4656.528.61643.376.2755.933.31741.881.0853.738.11841.185.7952.242.91939.690.51051.347.62024.995.2經(jīng)計(jì)算.Ex=54.2mmCv=0.39調(diào)整后得：圖2-1表2-2長(zhǎng)汀6h降雨量經(jīng)驗(yàn)頻率成果表序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%序號(hào)降水量〔mm經(jīng)驗(yàn)頻率<%>1174.72.4116052.421309.51259.557.1396.914.31358.561.9496.619.01456.266.7579.223.81552.971.4678.128.61652.576.2764.233.31751.281.0864.138.11849.385.7962.242.91946.490.51060.647.62037.595.2經(jīng)計(jì)算.Ex=68.8mmCv=0.4調(diào)整后得：圖2-2表2-3長(zhǎng)汀12h降雨量經(jīng)驗(yàn)頻率成果表序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%1178.82.41975.552.82141.75.62074.655.63129.88.32174.158.34113.711.12273.261.15111.113.92369.163.96106.616.72467.566.77106.419.42565.569.4810022.22662.672.2998.525.02759.375.01097.227.82858.777.81195.630.62957.780.61292.533.33057.483.31389.836.13153.386.11489.438.93253.288.91585.841.73352.791.71683.544.43451.794.41777.447.23551.597.21877.150.0經(jīng)計(jì)算.Ex=83.4mmCv=0.33調(diào)整后得：圖2-3表2-4長(zhǎng)汀24h降雨量經(jīng)驗(yàn)頻率成果表序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%1219.62.420102.451.32167.75.121101.853.83148.27.722100.756.4414410.32395.459.0513912.82495.161.56138.915.42593.664.17137.317.92690.466.78133.620.5278969.2912223.12886.671.810116.825.62984.974.411115.828.23079.576.912113.730.83176.779.513112.833.33270.382.114112.535.93369.984.615112.338.53466.287.216108.541.03561.189.717104.343.63659.592.318103.446.23758.394.919102.748.73856.997.4經(jīng)計(jì)算.Ex=104.9mmCv=0.31調(diào)整后得：圖2-4表2-5長(zhǎng)汀設(shè)計(jì)雨量成果表〔mmP<%>T<h>0.2121020CvCs/Cv3214.66164.7142.4192.671.520.513.56229.92180.26158.86109.1587.720.503.512240.2195.08175.28127.84106.290.383.524264.67221.1201.7154.11131.680.344.0表2-6P=0.2%長(zhǎng)汀降雨強(qiáng)度表T〔h設(shè)計(jì)雨量〔mm降雨強(qiáng)度<mm/h>3214.6671.566229.9238.3212240.220.0124264.6711.03表2-7P=1%長(zhǎng)汀降雨強(qiáng)度表T<h>設(shè)計(jì)雨量〔mm降雨強(qiáng)度〔mm/h3164.754.96180.2630.0412195.0816.2624221.19.21表2-8P=2%長(zhǎng)汀降雨強(qiáng)度表T<h>設(shè)計(jì)雨量〔mm降雨強(qiáng)度〔mm/h3142.4147.476158.8626.4812175.2814.6124201.78.40表2-9P=10%長(zhǎng)汀降雨強(qiáng)度表T<h>設(shè)計(jì)雨量〔mm降雨強(qiáng)度〔mm/h396.630.876109.1518.1912127.8410.6524154.116.42表2-10P=20%長(zhǎng)汀降雨強(qiáng)度表T<h>設(shè)計(jì)雨量〔mm降雨強(qiáng)度〔mm/h371.5223.84687.7214.6212106.298.8624131.685.49圖2-5根據(jù)長(zhǎng)汀站降雨強(qiáng)度與時(shí)間對(duì)數(shù)關(guān)系曲線.見圖2-5.解出暴雨遞減指數(shù)并求其平均值.為最終的暴雨遞減指數(shù)。2.3.2四都站24h設(shè)計(jì)暴雨計(jì)算根據(jù)四都站實(shí)測(cè)日最大雨量進(jìn)行頻率分析.其中1973年暴雨須作特大值處理.求出設(shè)計(jì)日雨量.再按經(jīng)驗(yàn)關(guān)系：.換算為24h設(shè)計(jì)雨量。表2-11四都最大一日降水量經(jīng)驗(yàn)頻率成果表序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%序號(hào)降水量〔mm經(jīng)驗(yàn)頻率〔%1332.51.0118952.42171.89.5128657.13130.114.31384.261.94121.219.01483.866.75118.923.81583.471.46110.428.61677.376.27108.233.31774.681.08108.238.11865.185.7993.442.91955.290.5109047.62054.395.2經(jīng)計(jì)算.,Ex=97.4mmCv=0.37調(diào)整后得：圖2-6表2-12四都24h設(shè)計(jì)暴雨單位：mm頻頻率雨量0.2%2%設(shè)計(jì)日雨量435.29274.5924h設(shè)計(jì)雨量496.23313.032.3.3設(shè)計(jì)雨力SP當(dāng)P=2%時(shí).根據(jù)公式求出設(shè)計(jì)雨力=175.68mm。當(dāng)P=0.2%時(shí).為278.46mm。2.3.4求各種歷時(shí)設(shè)計(jì)雨量利用暴雨公式：〔推求1h、3h、6h、24h設(shè)計(jì)雨量。表2-13P=2%時(shí)各種歷時(shí)設(shè)計(jì)雨量表T〔h13624Ht,p<mm>175.67214.49239.02303.34表2-14P=0.2%時(shí)各種歷時(shí)設(shè)計(jì)雨量表T〔h13624Ht,p<mm>278.41340.02378.90480.862.3.5陂下水庫(kù)壩址以上流域面平均設(shè)計(jì)雨量及時(shí)程分配直接移用四都站設(shè)計(jì)雨量.按XX省暴雨點(diǎn)~面折算關(guān)系求陂下水庫(kù)各種歷時(shí)流域設(shè)計(jì)面平均雨量。按XX省水文手冊(cè)中24h設(shè)計(jì)暴雨典型分配推求設(shè)計(jì)暴雨時(shí)程分配〔表3。查表并由內(nèi)插法算得：表2-15陂下水庫(kù)壩址以上流域點(diǎn)~面折算系數(shù)成果表T〔h13624折算系數(shù)0.8130.8490.8900.948表2-16P=2%時(shí)設(shè)計(jì)面平均雨量表T〔h13624設(shè)計(jì)面平均雨量<mm>142.81182.10212.73287.56表2-17設(shè)計(jì)暴雨時(shí)程分配表〔p=2%>〔mm日程最大24小時(shí)時(shí)段歷時(shí)662136占H1%100占〔H3-H1%100占〔H6-H3%100占〔H24-H6%204238設(shè)計(jì)暴雨過程15.9731.4339.292142.8130.62828.44表2-18P=0.2%時(shí)設(shè)計(jì)面平均雨量表T〔h13624設(shè)計(jì)面平均雨量<mm>226.39288.68337.22455.86表2-19P=0.2%時(shí)暴雨時(shí)程分配表<mm>日程最大24小時(shí)時(shí)段歷時(shí)662136占H1%100占〔H3-H1%100占〔H6-H3%100占〔H24-H6%204238設(shè)計(jì)暴雨過程23.72749.82662.288226.38748.54645.082.3.6求設(shè)計(jì)凈雨過程按XX省水文手冊(cè)規(guī)定.24h設(shè)計(jì)暴雨不扣損.直接將設(shè)計(jì)暴雨過程作為設(shè)計(jì)凈雨過程2.4損失參數(shù)μP=2%時(shí).i次=H24,p/24=11.98mm/h.查表并由內(nèi)插法算得.μ=4.29mm/hP=0.2時(shí).i次=H24,p/24=18.99mm/h.查表并由內(nèi)插法算得.μ=6.16mm/h2.5匯流參數(shù)m按XX省水文手冊(cè)經(jīng)驗(yàn)關(guān)系：推求。主河道長(zhǎng)度L=30.4km.主河道河底比降J=7.83‰。L/J1/3=153.16.查表并由內(nèi)插法算得.m=1.292.6設(shè)計(jì)洪峰流量推求用推理公式計(jì)算：當(dāng)時(shí)：當(dāng)時(shí)：采用試算法.試算法步驟如下：①由〔D式計(jì)算。②假定一個(gè).代入〔B式計(jì)算出τ。③計(jì)算〔1當(dāng)時(shí)：由〔A1式計(jì)算?！?當(dāng)時(shí)：由〔A2式計(jì)算。④比較和.〔1當(dāng).即為所求；〔2當(dāng).將.返回②。式中ε為誤差標(biāo)準(zhǔn)。試算法：P=0.2%時(shí) =10.22h表2-20P=0.2%設(shè)計(jì)洪峰流量試算表Qmp<m3/sTcτQmp’<m3/s255010.224.662689260010.224.642701265010.224.612713270010.224.592724271010.224.592726272010.224.582729273010.224.582731274010.224.582733275010.224.572735取校核洪峰流量Qmp=2730m3/sτ=4.58P=2%時(shí) =9.05h表2-21P=2%時(shí)試算成果表Qmp<m3/sTcτQmp’<m3/s14009.055.41146114109.055.40146314209.055.39146614309.055.38146814409.055.37147114509.055.37147314609.055.36147514709.055.35147814809.055.34148014909.055.33148215009.055.321485取設(shè)計(jì)洪峰流量Qmp=1480m3/sτ=5.342.7設(shè)計(jì)洪水過程線2.7.1分割時(shí)段地表徑流和地下徑流記時(shí)段凈雨為Ri.時(shí)段地表凈雨為RSi.時(shí)段地下凈雨為Rgi。當(dāng)Ri>μ：當(dāng)：地表凈雨〔mm地下凈雨〔mm表2-22P=2%時(shí)時(shí)段地表和地下凈雨量表時(shí)段歷時(shí)〔h662136Rgi<mm>15.9725.748.584.2912.8725.74Rsi〔mm05.6930.71138.5217.762.70地表凈雨=195.38mm地下凈雨=93.19mm表2-23P=0.2%時(shí)時(shí)段地表和地下凈雨量表時(shí)段歷時(shí)〔h662136Rgi<mm>23.7336.9612.326.1618.4836.96Rsi〔mm012.8749.97220.2330.078.12地表凈雨=321.25mm地下凈雨=134.61mm2.7.2計(jì)算設(shè)計(jì)洪量當(dāng)P=2%時(shí).根據(jù)公式算得地表洪量=32433080m3地下洪量=15469540m3P=0.2%時(shí).根據(jù)公式算得地表洪量=53327002m3地下洪量=22344762m32.7.3地表洪水過程線采用XX省概化洪水過程線推求。先計(jì)算洪水形狀系數(shù).式中..T為地表洪水過程線的底寬.24h設(shè)計(jì)雨量固定為50h.然后根據(jù)γ值查關(guān)系表〔見表9.乘以地表洪峰流量即得設(shè)計(jì)地表洪水過程線〔表9。P=2%時(shí).=0.12P=0.2%時(shí).=0.11表2-24設(shè)計(jì)/校核洪水過程線表t<h>p=2%Qt<m3/s>Qm<m3/s>Qt+QmP=0.2%Qt<m3/s>Qm<m3/s>Qt+QmQt/Qm<%><m3/s>Qt/Qm<%><m3/s>00000000032.33453926377065.88610965.21581517377.2107121196.41971721488.6127141417.723520255910.1149151659276222981011.81751719210.5322253471113.72031922212.4374274011216.32412126214.7445304751319.62902231217.8535325671428.24172444125.8770358051546.46872671343.1126737130415.572.8107727110469.31987382026161001480281508100273040277016.581.8121128123979.822334122741767.299529102464.318354218771844.66603169141.112184512621934.15053353731931479782027.44063444024.7748507982122.83373637420.5622526752219.62903832817.5535555902317.12534029315.1467575242414.72184125912.9401604612512.81894323211.1349624122611163452079.630065365304.262521143.411574189351.62460841.24487131400.91369820.82599124450.3477820.2811212050008686001241245184841221225283831191195381811171175479791141145577771121125676761091095774741071075872721041045970701021026069699999616767979762656594946364649292646262898965606087876658588484675757828268555579796953537777705252747471505072727248487070734646676774454565657543436262764141606077404057577838385555793636525280343450508133334747823131454583292942428428284040852626373786242435358722223232882121303089191927279017172525911515222292141420209312121717941010151595991212967710109755779833559922221000000圖2-7設(shè)計(jì)洪水地表過程線圖2-8校核洪水地表過程線2.7.4地下洪水過程線地下洪水過程線概化為等腰三角形.底寬是地表洪水過程線底寬的兩倍.洪峰流量.T為地表洪水過程線的底寬。P=2%時(shí).=86m3/sP=0.2%時(shí).=124m3/s

圖2-9地下洪水過程線2.7.5設(shè)計(jì)洪水過程線將地下洪水過程線的洪峰流量置于地表洪水過程線的終止點(diǎn).起漲點(diǎn)和地表洪水過程線的起漲點(diǎn)重合.中間過程按直線內(nèi)插.然后同時(shí)刻地表流量和地下流量疊加即得設(shè)計(jì)洪水過程線。圖2-10設(shè)計(jì)洪水過程線圖2-11校核洪水過程線設(shè)計(jì)成果表3-1 設(shè)計(jì)成果表暴雨遞減指數(shù)n2四都站24h設(shè)計(jì)雨量H24,p〔mm設(shè)計(jì)雨力Sp<mm>損失參數(shù)μ<mm/h>匯流參數(shù)m設(shè)計(jì)洪峰流量Qmp<m3/s>設(shè)計(jì)0.82313.03274.594.291.291480校核0.82496.23435.296.161.292730地表凈雨Rs<mm>地下凈雨Rg<mm>地表洪量Ws<m3>地下洪量Wg<m3>洪水形狀系數(shù)γ地下洪峰流量Qmg<m3/s>設(shè)計(jì)195.3893.1932433080154695400.1286校核321.25134.6153327002223447620.11124第4章成果合理性分析根據(jù)XX省及XX省XX市部分小流域?qū)崪y(cè)洪水頻率計(jì)算成果分析論證陂下水庫(kù)設(shè)計(jì)洪水的合理性和可靠性。設(shè)面積為取對(duì)數(shù)為x.洪峰流量取對(duì)數(shù)為y表4-1成果合理性分析成果表F<km2>Qm<m3/s>logFlogQm37713302.583.1252716202.723.2174127202.873.43588865003.773.8179226202.903.422809802.452.9931.52571.502.4119210602.283.0365429402.823.4764222202.813.3591117602.963.2534812302.543.0956926002.763.4146711502.673.0651.54001.712.60經(jīng)計(jì)算.回歸線性方程為：y=0.63x+1.52。以95%為置信區(qū)間做該直線的兩條平行線作為所有點(diǎn)的包線,經(jīng)計(jì)算.兩條平行線的方程分別為Y=0.63x+1.85y=0.63x+1.18做成果分析.把F=166.Qm=1480m3/s點(diǎn)在圖中.該點(diǎn)剛好落在包線的區(qū)域內(nèi)部.所以坡下水庫(kù)設(shè)計(jì)洪水合理。圖4-1附錄附表1各水文站站有關(guān)資料年限統(tǒng)計(jì)表站名觀音橋官莊上杭桃溪楊家坊長(zhǎng)汀新橋鐵長(zhǎng)庵杰四都濯田流域面積〔km237734685888527741觀測(cè)項(xiàng)目流量流量流量流量流量雨量雨量雨量雨量雨量雨量資料年限1958~19751951~19751941~19751958~19751958~19751941~19751956~19751963~19751965~19751956~19751956~1975附表2．各雨量站逐年各時(shí)段最大降水量統(tǒng)計(jì)表站名長(zhǎng)汀四都濯田年份3h6h12h24h最大一日最大一日193695．11937116．81938103．4193995．6113．7194077．1100．7194167．584．9194298．5139．0194351．559．5194459．389．0194569．176．7194689．8108．5194765．593．61948106．6112．519491950195162．6137．3195257．769．9195397．2104．3195451．756．9195574．686．6195624．937．553．279．584．284．3195750．151．277．4102．483．4123．7195839．649．353．361．174．670．1195995．5130．0141．7144．086．0137．6196045．452．552．766．277．391．0196152．260．085．8101．890．0165．8196243．378．192．5102．7118．995．0196341．858．575．5112．383．896．8196464．196．9129．8167．7108．2159．9196546．552．9100．0148．2121．280．01966154．4174．7178．8219．6171．8196．1196741．146．458．770．365．184．1196857．059．574．1112．855．278．6196963．464．183．595．493．4113．2197050．160．673．2115．889．0110．5197155．956．257．458．354．366．8197247．962．289．490．4110．4141．1197351．364．2111．1133．6332．5161．4197453．779．2113．7138．9130．1110．1197556．596．6106．4122．0108．2138．4附表3．XX省暴雨點(diǎn)~面折算關(guān)系表F〔km2t〔h02040608010012014016018011.0000.9450.9110.8840.8640.8470.8340.8230.8150.80731.0000.9600.9310.9100.8930.8790.8670.8580.8510.84561.0000.9770.9570.9420.9280.9170.9070.8990.8920.886121.0000.9860.9720.9610.9510.9430.9350.9280.9210.915241.0000.9910.9830.9750.9690.9640.9590.9530.9490.944附表4．XX省設(shè)計(jì)暴雨時(shí)程分配表日程最大24小時(shí)時(shí)段歷時(shí)〔h662136占H1%100占〔H3-H1%100占〔H6-H3%100占〔H24-H6%204238附表5．XX省次暴雨強(qiáng)度和損失參數(shù)μ關(guān)系表〔單位：mm/h051015202530μ02．03．75．26．47．38．1附表6．降雨歷時(shí)等于24小時(shí)的徑流系數(shù)α值表〔設(shè)計(jì)手冊(cè)地區(qū)H24〔mm土壤粘土類壤土類沙壤土類山區(qū)100~2000.65~0.800.55~0.700.40~0.60200~3000.80~0.850.70~0.750.60~0.70300~4000.85~0.900.75~0.800.70~0.75400~5000.90~0.950.80~0.850.75~0.80500以上0.95以上0.85以上0.80以上丘陵區(qū)100~2000.60~0.750.30~0.550.15~0.35200~3000.75~0.800.55~0.650.35~0.50300~4000.80~0.850.65~0.700.50~0.60400~5000.85~0.900.70~0.750.60~0.70500以上0.90以上0.75以上0.70以上附表7XX省匯流參數(shù)m經(jīng)驗(yàn)關(guān)系表L/J1/320406080100120140160m0.500.740.911.041.131.211.261.30L/J1/3180200220240260280300m1.341.381.411.431.451.481.51附表8.匯流參數(shù)m值查用表〔設(shè)計(jì)手冊(cè)類別雨洪特征、河道特征、土壤植被流域特征因素θ1~1010~3030~90Ⅰ雨量豐沛的濕潤(rùn)山區(qū).植被條件優(yōu)良.森林覆蓋率達(dá)70%以上.多為深山原始森林區(qū).枯枝落葉層厚.壤中流較豐富.河床呈山區(qū)形大卵石、大礫石河槽.有跌水.洪水多呈緩落型。0.20~0.300.20~0.350.35~0.40Ⅱ南方、東北濕潤(rùn)山丘.植被條件良好.以灌木林、竹林為主的石山區(qū).或森林覆蓋率達(dá)40~50%..或流域內(nèi)以水稻田或優(yōu)良的草皮為主.河床多礫石、卵石.兩岸灘地雜草叢生.大洪水多為尖瘦型.中小洪水多為矮胖型。0.30~0.400.40~0.500.50~0.60Ⅲ南、北方地理景觀過渡區(qū).植被條件一般.以稀疏林、針葉林、幼林為主的土石山區(qū)或流域內(nèi)耕地較多。0.60~0.700.70~0.800.80~0.95Ⅳ北方半干旱地區(qū).植被條件差.以荒草坡、梯田或少量的稀疏林為主的土石山區(qū).瀚作物較多.河道呈寬淺型.間歇型水流.洪水陡漲陡落。1.00~1.301.30~1.601.60~1.80備注：附表9.XX省24h暴雨洪水概化過程線系數(shù)表〔Qt/Qm%γt<h>0.100.110.120.130.140.150.160.170.180.190.2000000000000031.72.02.32.73.03.33.64.04.44.85.164.55.25.86.57.38.18.89.410.110.711.475.66.47.28.08.99.710.511.312.112.913.786.87.78.69.510.511.412.413.314.215.116.098.09.010.111.112.213.314.415.416.517.518.6109.410.511.813.014.215.416.717.919.220.421.61111.012.413.715.116.618.019.520.922.323.625.01213.114.716.3