本文關(guān)鍵詞：柴達(dá)木盆地次生鹽堿地工程治理技術(shù)研究　出處：《青海大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 柴達(dá)木盆地 次生鹽堿地 工程 治理技術(shù)

【摘要】：在柴達(dá)木盆地分布著大范圍的次生鹽堿地,調(diào)研發(fā)現(xiàn)這是由于盆地各灌區(qū)灌排系統(tǒng)不健全,有灌無排,地下水抬升所導(dǎo)致,嚴(yán)重影響著農(nóng)作物的正常生長。因此,通過開展新型暗管排水技術(shù)研究為有效降低地下水位,改良土壤為農(nóng)作物的生長提供良好的土壤環(huán)境,提高土地利用率。本研究是通過采用新型暗管排水技術(shù),在柴達(dá)木盆地的適應(yīng)性研究,提出暗管間距、埋深及合理的沖洗定額。對實(shí)驗(yàn)中的混凝土集水管為增強(qiáng)其強(qiáng)度和耐腐性,給其加入一定量的納米材料,研究其強(qiáng)度、密實(shí)度及耐腐性。試驗(yàn)結(jié)果顯示,不同暗管埋深和間距下的暗管排水均能有效的降低土壤的含鹽量。根據(jù)設(shè)定的灌溉制度,“灌—排”后的土壤含鹽量均達(dá)到了0.5%以下,符合枸杞的正常生長。而且,在砂漿中加入一定量的納米材料后,能有效的增加其強(qiáng)度和密實(shí)度,從而減少輸水過程中的水分下滲量,防止土壤次生鹽堿化的發(fā)生。最后通過對不同的暗管埋深和間距布置的分析,并結(jié)合非穩(wěn)定流計(jì)算公式以及排鹽和經(jīng)濟(jì)效益指標(biāo),提出了該試驗(yàn)區(qū)暗管排水布置的二維非線性規(guī)劃數(shù)學(xué)模型,利用梯度投影法結(jié)合軟件進(jìn)行模型求解計(jì)算,確定適合該試驗(yàn)區(qū)的最優(yōu)暗管布局。
[Abstract]:In Qaidam Basin, a large area of secondary saline-alkali land is distributed. It is found that this is caused by the imperfect irrigation and drainage system in each irrigation area of the basin, the irrigation without drainage, and the uplift of groundwater. Therefore, through the development of new underground drainage technology to effectively reduce the groundwater level, improve the soil for the growth of crops to provide a good soil environment. This study is based on the study of the adaptability of the new underground drainage technology in Qaidam Basin, and the distance between the hidden pipes is put forward. In order to enhance the strength and corrosion resistance of the concrete collector in the experiment, a certain amount of nano-material was added to study its strength, compactness and corrosion resistance. Under the different buried depth and spacing of the dark pipe drainage can effectively reduce the salt content of the soil. According to the irrigation system, the salt content of the soil after "irrigation and drainage" reached below 0.5%. In accordance with the normal growth of Lycium barbarum. Moreover, adding a certain amount of nano-materials to the mortar can effectively increase its strength and compactness, thus reducing the amount of water infiltration in the process of water transfer. Finally, through the analysis of different buried depth and spacing arrangement of dark pipe, combined with the calculation formula of unsteady flow and the index of salt discharge and economic benefit. A two-dimensional nonlinear programming mathematical model for the drainage arrangement of the underground pipe in the experimental area is presented. The optimal layout of the dark pipe is determined by using the gradient projection method combined with the software to solve the model.
【學(xué)位授予單位】：青海大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：S156.4

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