本文選題：溝灌 + 入滲　； 參考：《水利學(xué)報(bào)》2017年11期

【摘要】：入滲參數(shù)的準(zhǔn)確估計(jì)是溝灌系統(tǒng)設(shè)計(jì)優(yōu)化的關(guān)鍵問(wèn)題。本文基于基因表達(dá)式編程(GEP)算法,通過(guò)數(shù)值試驗(yàn)獲得了溝灌入滲模型參數(shù)γ估計(jì)GEP算法所需的有效數(shù)據(jù)集合,進(jìn)行了參數(shù)γ的敏感性分析,確定了模型參數(shù)γ估計(jì)GEP算法的輸入因子及其最優(yōu)組合,建立了γ與最優(yōu)組合因子的定量關(guān)系,進(jìn)而提出了γ的估計(jì)方法。研究結(jié)果表明,γ對(duì)積水深度、初始有效含水率和溝深度最敏感;土壤水力特性參數(shù)對(duì)γ影響較大,模型參數(shù)γ估計(jì)GEP算法的最優(yōu)輸入因子組合為積水深度、溝深、初始有效含水率、飽和導(dǎo)水率和進(jìn)氣值參數(shù);變積水深度條件下γ的估計(jì)值與定積水深度的γ值相近;在變積水深度條件下,與利用HYDRUS-2D模型計(jì)算得到的"精確"入滲量相比,應(yīng)用基于γ估計(jì)值的溝灌入滲模型計(jì)算的累積入滲量誤差小于5%,滿足計(jì)算精度要求。入滲過(guò)程中邊界效應(yīng)對(duì)總?cè)霛B量的貢獻(xiàn)逐漸增大,與細(xì)質(zhì)土壤相比,粗質(zhì)土壤中邊界效應(yīng)對(duì)總?cè)霛B量的貢獻(xiàn)更大,本研究條件下黏壤土中邊界效應(yīng)最終貢獻(xiàn)約為25%,砂土中約為37%。研究表明GEP算法可作為溝灌入滲模型參數(shù)γ估計(jì)的一種有效方法。
[Abstract]:Accurate estimation of infiltration parameters is a key problem in the design and optimization of gully irrigation system. Based on the genetic expression programming (GEP) algorithm, the effective data set for parameter 緯 estimation of ditch irrigation infiltration model is obtained by numerical experiments, and the sensitivity of parameter 緯 is analyzed. The input factor and its optimal combination of the model parameter 緯 estimation GEP algorithm are determined. The quantitative relationship between 緯 and the optimal combination factor is established, and the estimation method of 緯 is put forward. The results show that 緯 is the most sensitive to water depth, initial effective water content and ditch depth, and soil hydraulic characteristic parameters have great influence on 緯, and the optimal input factors of model parameter 緯 estimation GEP algorithm are water depth, ditch depth, etc. The initial effective water content, saturated water conductivity and inlet air value parameters, the estimated value of 緯 under varying water depth is close to that of constant water depth, and compared with the "accurate" infiltration calculated by using HYDRUS-2D model under variable water depth. The cumulative infiltration error calculated by using the gutter irrigation infiltration model based on 緯 -estimation value is less than 5, which meets the requirement of calculation precision. In the process of infiltration, the contribution of boundary effect to the total infiltration is gradually increasing. Compared with fine soil, the boundary effect in coarse soil contributes more to the total infiltration. In this study, the final contribution of boundary effect in clay loam is about 25%, and that in sandy soil is about 37%. The results show that GEP algorithm can be used as an effective method to estimate the parameters of gully irrigation infiltration model.
【作者單位】： 中國(guó)農(nóng)業(yè)大學(xué)水利與土木工程學(xué)院;中國(guó)-以色列國(guó)際農(nóng)業(yè)研究培訓(xùn)中心;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51639009)
【分類號(hào)】：S152.7;S275.3

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