本文選題：埋深 + 風(fēng)速　； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：近些年,國(guó)內(nèi)外對(duì)潛水蒸發(fā)影響因素及影響機(jī)理進(jìn)行了相關(guān)的研究,但是多數(shù)只在宏觀上給出了潛水蒸發(fā)與土質(zhì)及埋深的關(guān)系,鮮有研究不同潛水埋深和有、無(wú)風(fēng)的影響下(即不同空氣流通情況下)土壤含水量的分布特征及分布機(jī)理。本文選取滲透系數(shù)較小的砂土做為研究對(duì)象,研究了砂土的物理性質(zhì),設(shè)計(jì)了一個(gè)可以改變潛水位和空氣流速的非脅迫潛水蒸發(fā)試驗(yàn)裝置。在該試驗(yàn)中設(shè)計(jì)了兩個(gè)初始條件相同的砂柱,通過(guò)改變砂柱表面的空氣流速,來(lái)達(dá)到改變其表面的大氣條件的目的,利用放置在試驗(yàn)砂柱固定埋深處的土壤溫度傳感器以及土壤水分傳感器,收集兩個(gè)砂柱固定觀測(cè)點(diǎn)處的土壤水分和土壤溫度隨時(shí)間變化的數(shù)據(jù)。在試驗(yàn)范圍內(nèi),通過(guò)對(duì)不同潛水埋深與空氣流速下的數(shù)據(jù)分析認(rèn)為,空氣溫度與空氣濕度的關(guān)聯(lián)性較差,而空氣溫度與土表溫度的關(guān)聯(lián)性較強(qiáng),土表溫度隨空氣溫度起伏變化。通過(guò)對(duì)不同潛水埋深以及風(fēng)速下的土壤溫度研究得出,隨著埋深不斷增加,土表溫度和深層土壤溫度的差異性越大。在相同潛水埋深下,隨著空氣流速的加快,土表溫度和深層土壤溫度的差異性減小。通過(guò)對(duì)不同風(fēng)速條件下蒸發(fā)量的對(duì)比可知,大氣條件對(duì)土壤的水分分布以及水汽的運(yùn)移有很大的影響作用,對(duì)于某種均勻介質(zhì)而言,潛水穩(wěn)定蒸發(fā)強(qiáng)度與空氣流速在一定范圍內(nèi)呈正相關(guān),但當(dāng)空氣流速達(dá)到一定程度時(shí),潛水穩(wěn)定蒸發(fā)強(qiáng)度達(dá)到極限值�；赑dV方程,通過(guò)hydrus-1D建模軟件建立砂柱的土壤水熱運(yùn)移模型,經(jīng)過(guò)相同條件下的實(shí)測(cè)值與模擬值對(duì)比,可以驗(yàn)證該試驗(yàn)中潛水蒸發(fā)量的計(jì)算是有效的。
[Abstract]:In recent years, the influencing factors and mechanism of phreatic evaporation have been studied at home and abroad, but most of them have only given the relationship between phreatic evaporation and soil quality and burial depth. The distribution characteristics and mechanism of soil water content under the influence of wind (I. E. under different air circulation conditions). In this paper, sand with small permeability coefficient is selected as the research object, the physical properties of sand are studied, and a non-stress phreatic evaporation test device is designed, which can change the water level and air velocity. In this experiment, two sand columns with the same initial conditions were designed to change the atmospheric conditions of the sand column surface by changing the air velocity on the surface of the sand column. Using the soil temperature sensor and the soil moisture sensor placed in the fixed buried depth of the test sand column, the data of soil moisture and soil temperature change with time at two fixed observation points of sand column were collected. In the range of test, through the analysis of the data under different diving depth and air velocity, it is concluded that the correlation between air temperature and air humidity is not good, but the correlation between air temperature and soil surface temperature is stronger, and the soil surface temperature varies with air temperature fluctuation. Through the study of soil temperature under different depth of groundwater and wind speed, it is concluded that the difference between soil surface temperature and deep soil temperature is greater with the increasing of buried depth. Under the same diving depth, the difference between soil surface temperature and deep soil temperature decreases with the acceleration of air velocity. The comparison of evaporation under different wind speeds shows that atmospheric conditions have a great effect on soil moisture distribution and water vapor migration. The steady evaporation intensity of phreatic water is positively correlated with the air velocity in a certain range, but when the air velocity reaches a certain degree, the evaporation intensity reaches the limit value. Based on PdV equation and hydrus-1D modeling software, the soil hydrothermal transport model of sand column is established. By comparing the measured values with the simulated values under the same conditions, it can be verified that the calculation of phreatic evaporation in this experiment is effective.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：S152.7

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