發(fā)布時(shí)間：2018-04-10 16:28

  本文選題：填埋場 + 騰發(fā)封頂��； 參考：《巖土工程學(xué)報(bào)》2016年03期

【摘要】：毛細(xì)阻滯型騰發(fā)封頂目前主要用于國外干旱、半干旱地區(qū),在濕潤氣候區(qū)的研究很少。在杭州市露天構(gòu)筑毛細(xì)阻滯型騰發(fā)封頂模型,量測18個(gè)月中降水、蒸發(fā)和植被蒸騰下土柱透水量、地表徑流量和土體含水率,得到該封頂在不同季節(jié)的響應(yīng),分析了毛細(xì)阻滯作用機(jī)理及其性能,使用水量平衡模型(HELP)和土壤 植被 大氣相互作用模型(VADOSE/W)對試驗(yàn)過程中的水量平衡進(jìn)行模擬,探討了數(shù)值模擬存在的問題。試驗(yàn)過程中,共降水2361 mm,產(chǎn)生地表徑流88.4 mm,透水67.4 mm,其他降水均在土層吸持與騰發(fā)交替作用下最終返回大氣,由于試驗(yàn)地區(qū)多雨期與植被騰發(fā)旺盛期重合,毛細(xì)阻滯型騰發(fā)封頂在該地區(qū)具有良好性能。由于毛細(xì)阻滯作用,使得上部黏土中存儲了更多水分用于后期騰發(fā),從而減少了透水量,當(dāng)毛細(xì)阻滯界面附近土體的體積含水率超過臨界含水率時(shí)毛細(xì)阻滯界面被擊穿,擊穿是連續(xù)強(qiáng)降雨作用的結(jié)果。HELP和VADOSE/W均高估了地表徑流和透水量、低估了騰發(fā)量,因?yàn)閂ADOSE/W能考慮毛細(xì)阻滯的機(jī)理,所以大致上VADOSE/W的模擬結(jié)果比HELP更合理和準(zhǔn)確。
[Abstract]:Capillary block hair cap is mainly used in arid and semi-arid areas of foreign countries.In Hangzhou, a capillarity-retarded topping model was constructed in the open air. The soil column permeability, surface runoff and soil moisture content were measured during 18 months of precipitation, evaporation and vegetation transpiration, and the response of the cap in different seasons was obtained.The mechanism of capillary retardation and its performance are analyzed. The water balance during the experiment is simulated by using the water balance model (Help) and the soil vegetation / atmosphere interaction model (VADOSEP / W). The problems in the numerical simulation are discussed.During the experiment, 2361 mm of precipitation, 88.4 mm of surface runoff and 67.4 mm of permeable water were produced. The other precipitation was eventually returned to the atmosphere under the alternating action of soil absorption and transpiration, because the rainy period coincided with the vigorous period of vegetation transpiration.Capillary block hair cap has good performance in this area.As a result of capillary blocking, more moisture is stored in the upper clay for later hair release, thus reducing the permeability. When the volume moisture content of the soil near the capillary block exceeds the critical water content, the capillary block interface is broken down.Breakdown is the result of continuous heavy rainfall. Both Help and VADOSE/W overestimate the surface runoff and permeability and underestimate the transpiration, because VADOSE/W can consider the mechanism of capillary arrest, so the simulation results of VADOSE/W are more reasonable and accurate than HELP.
【作者單位】： 上海大學(xué)土木工程系;
【基金】：國家自然科學(xué)基金項(xiàng)目(51178260,51478256) 上海市教委科研創(chuàng)新項(xiàng)目(14YZ005)
【分類號】：X705
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本文編號：1732036