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1、201002808作業(yè)4、等流時(shí)線法任秋麗1、根據(jù)下表前三列數(shù)據(jù)采用等流時(shí)線法推求出口斷面的地面徑流流量過(guò)程線。2、利用克拉克法修正漫流過(guò)程線。(等流時(shí)線法推求的流量過(guò)程線稱為漫流過(guò)程線)（1）通過(guò)試算法確定蓄量參數(shù)K。（假設(shè)K，采用線性水庫(kù)推流公式推求流量過(guò)程線）（2）推求修正后的地面徑流過(guò)程線。（作業(yè)需要附兩條流量過(guò)程線的對(duì)比圖）表1、12345時(shí)間(日.時(shí))()()Qt（m3/s)25.10 10.0 21080013 18.4 430202194.444416 11.8 550740755.925919 10.0 93010401471.29622 6.5
2、89017102462.40726.1 3.0 82026403533.9814 105033804118.0567 41035904653.24110 33504601.01913 26503398.98116 21302160.92619 16301239.35222 1370538.425927.1 1050113.88894 91007 700010 620013 4700解答：1、已知rd,ΔF，代入等流時(shí)線法匯流公式：Qt=1/Δτ*分別求出出口斷面的地面徑流Qt，并列入上表表1中的第5欄中，與實(shí)測(cè)流量對(duì)比作圖如下圖1。圖1123
3、45678時(shí)間(日.時(shí))()()Qt（m3/s)I=10*103*F/(3600*3)2C0*IC2*I25.10 10.0 210800194.44444461.4036111013 18.4 430202194.4444398.148148125.73120442.01316 11.8 550740755.9259509.259259160.818981114.772319 10.0 93010401471.296861.111111271.930278188.562522 6.5 89017102462.407824.074074260.234352315.0
4、7426.1 3.0 82026403533.981759.259259239.766481393.6324 105033804118.056972.222222307.018056433.37797 41035904653.241379.62963119.883241506.586710 33504601.01900428.637313 26503398.98100293.278216 21302160.92600200.66419 16301239.35200137.296422 1370538.42590093.9396727.1 105011
5、3.88890064.274514 91000043.97737 70000030.0897310 62000020.5877113 47000014.08633表22、（1）通過(guò)試算法確定蓄量參數(shù)K。試算，第一次假設(shè)K1=8h，而Δt=3h,由公式：C0=0.5Δt/(K+0.5Δt)，和C2=(K-0.5Δt)/(K+0.5Δt)算得C0=0.157895C2=0.684211.由線性水庫(kù)推流演算公式：Q2=2C0*I+C2*Q1進(jìn)行演算即得克拉克單位線，計(jì)算結(jié)果列上表2.(2)推求修正后的地面徑流過(guò)程線。用所求單位線推求各時(shí)段凈雨出流過(guò)程，進(jìn)而求和計(jì)算
6、流量過(guò)程線。計(jì)算結(jié)果列于下表3。單位線（m3/s)rd1rd2rd3rd4rd5rd6Q計(jì)算61.4036161.4036161.40361167.7442167.7442112.9826280.7268275.5913275.5913308.649372.45626656.6969460.4928460.4928507.088197.938261.403611226.923575.3083575.3083847.3067325.1978167.744240.83341956.39633.3985633.39851058.567543.3815275.5913111
7、.549918.421082640.91740.396740.3961165.453678.8639460.4928183.268250.323263278.797626.47626.471362.329747.4102575.3083306.227782.67743700.422428.6373428.63731152.705873.6673633.3985382.5801138.14783609.136293.2782293.2782788.6927739.2346740.396421.21172.59253155.404200.664200.664539.
