發(fā)布時(shí)間：2018-04-17 04:36

  本文選題：MODFLOW + HYDRUS　； 參考：《中國農(nóng)村水利水電》2017年07期

【摘要】：為實(shí)現(xiàn)飽和、非飽和帶水分運(yùn)動(dòng)耦合模型參數(shù)的有效率定,以內(nèi)蒙古河套灌區(qū)永聯(lián)試驗(yàn)區(qū)的地下水位、土壤含水率實(shí)測數(shù)據(jù)為基礎(chǔ),選用MODFLOW-HYDRUS耦合模型,采用試錯(cuò)法與PEST優(yōu)化算法相結(jié)合的方法,對(duì)水文地質(zhì)參數(shù)和土壤水力參數(shù)進(jìn)行優(yōu)化。優(yōu)化結(jié)果表明:通過PEST算法進(jìn)行參數(shù)優(yōu)化后,耦合模型模擬精度有所提高,決定系數(shù)提高了2%~35%,納什系數(shù)提高了6%~11.3倍,均方根誤差減小了5%~20%,標(biāo)準(zhǔn)化均方根誤差減小了5%~20%。其中驗(yàn)證期土壤含水率的各項(xiàng)評(píng)價(jià)指標(biāo)提高或減小的幅度均為最大,決定系數(shù)、納什系數(shù)、均方根誤差和標(biāo)準(zhǔn)化均方根誤差變化幅度分別為35%、11.3倍、20%和20%。
[Abstract]:In order to achieve saturation and determine the effective rate of the coupling model parameters of unsaturated zone water movement, based on the measured data of groundwater level and soil moisture content in Hetao Irrigation area of Inner Mongolia, MODFLOW-HYDRUS coupling model was selected.The hydrogeological parameters and soil hydraulic parameters were optimized by the combination of trial and error method and PEST optimization algorithm.The optimization results show that the simulation accuracy of the coupled model is improved by using PEST algorithm, the determining coefficient is increased by 2 / 35, the Nash coefficient is increased by 6 / 11.3 times, the root mean square error is reduced by 5 / 20, and the standardized RMS error is reduced by 5 / 20.The range of increasing or decreasing of each evaluation index of soil moisture content in validation period was the largest, and the change range of determining coefficient, Nash coefficient, root mean square error and standardized root mean square error were 35% 11.3 times 20% and 20% respectively.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家重點(diǎn)研發(fā)計(jì)劃課題(2016YFC0501304) 國家自然科學(xué)基金資助項(xiàng)目(51379151,50376031) 內(nèi)蒙古自治區(qū)水利科技計(jì)劃項(xiàng)目([2014]117-2)
【分類號(hào)】：S152.7
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本文編號(hào)：1762122