本文選題：土壤水分特征曲線　切入點(diǎn)：剖面含水率　出處：《長安大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：土壤水分特征曲線是土壤最基本的參數(shù)之一,它是描述土壤水的基質(zhì)勢(shì)或者吸力隨著土壤含水率變化的關(guān)系曲線。土壤水分特征曲線對(duì)研究土壤水滯留、運(yùn)移、非飽和土的滲透系數(shù)等均有重要作用,對(duì)土壤污染、地面沉降、邊坡失穩(wěn)等具有重要意義。然而土壤水分特征曲線是高度非線性的,難以從理論上推導(dǎo)其數(shù)學(xué)表達(dá)式,而且直接測(cè)量土壤水分特征曲線耗時(shí)長、成本高。因此,對(duì)土壤水分特征曲線進(jìn)行解析并預(yù)測(cè)具有重大意義。本文以土壤水分特征曲線的推求方法為研究目標(biāo),運(yùn)用物理經(jīng)驗(yàn)法中Arya-Paris模型(A-P方法)、分形幾何法中Brooks-Corey模型(B-C方法)以及剖面含水率推求土壤水分特征曲線方法對(duì)中砂、細(xì)砂等六種土樣的土壤水分特征曲線進(jìn)行解析及預(yù)測(cè),并得到以下結(jié)論:1.利用不同土壤顆粒累積曲線模型對(duì)中砂、細(xì)砂等六種土壤進(jìn)行擬合,就擬合效果而言:Gompertz模型、Mlog模型Weibull模型、Morgan模型、HP模型、S2P模型以、LS模型Fredlund模型Jaky模型,綜合分析后表明,Gompertz模型、Mlog模型比較適合描述土壤顆粒累積曲線,這為A-P法和B-C法的計(jì)算做了必要的基礎(chǔ)準(zhǔn)備。2.以土壤顆粒分布為基礎(chǔ),運(yùn)用物理經(jīng)驗(yàn)法中A-P法、分形幾何法中B-C法對(duì)中砂、細(xì)砂等六種土樣進(jìn)行了土壤水分特征曲線的間接預(yù)測(cè)。結(jié)果表明A-P法比較適合推求中等粒徑土壤(比如粉砂)的土壤水分特征曲線,B-C法與之相反,對(duì)較小或較大粒徑土壤推求結(jié)果較好。3.通過Van Genuchten模型、Gardner模型及非飽和垂直一維達(dá)西定律推導(dǎo)了通量q,有效含水率Se等的理論關(guān)系,得到了Van Genuchten模型、Gardner模型的參數(shù)估算公式,并以此為基礎(chǔ),利用不同時(shí)刻剖面含水率,實(shí)現(xiàn)了Van Genuchten模型、Gardner模型的參數(shù)求解,驗(yàn)證結(jié)果表明這種方法所推求的土壤水分特征曲線具有較高精度。
[Abstract]:The characteristic curve of soil moisture is one of the most basic parameters of soil, it is the relation curve of describing the matrix potential or suction of soil water with the change of soil moisture content, the characteristic curve of soil moisture is used to study the retention and migration of soil water. The permeability coefficient of unsaturated soil plays an important role in soil pollution, land subsidence, slope instability and so on. However, the characteristic curve of soil moisture is highly nonlinear, so it is difficult to derive its mathematical expression theoretically. Therefore, it is of great significance to analyze and predict the characteristic curve of soil moisture. Using Arya-Paris model A-P method in physical experience method, Brooks-Corey model B-C method in fractal geometry method) and section moisture content calculating soil moisture characteristic curve method, the soil moisture characteristic curves of six kinds of soil samples, such as medium sand and fine sand, are analyzed and forecasted. The following conclusions are obtained: 1. Six kinds of soils, such as middle sand and fine sand, are fitted with different soil particle accumulation curve models. In terms of fitting effect, Weibull model of Mlog model and Weibull model of Morgan model and S2P model of HP model and S2P model are used as Jaky model of Fredlund model of LS model. The comprehensive analysis shows that the Gompertz model / Mlog model is more suitable to describe the soil particle accumulation curve, which makes necessary foundation preparation for the calculation of A-P method and B-C method. 2. Based on the distribution of soil particles, the A-P method is used in the physical experience method. In the fractal geometry method, B-C method is used to predict indirectly the soil moisture characteristic curves of six kinds of soil samples, such as medium sand and fine sand. The results show that A-P method is more suitable for calculating soil moisture characteristic curve of medium diameter soil (such as silt). The theoretical relationships of flux Q, effective moisture content se and so on are derived by Van Genuchten model and unsaturated vertical one-dimensional Darcy's law. The parameter estimation formulas of Van Genuchten model Gardner model are obtained. On the basis of this, the parameters of Van Genuchten model and Gardner model are solved by using the moisture content of different sections at different times. The results show that the characteristic curve of soil moisture obtained by this method has a high accuracy.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：S152.7

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