CAJ | 학술논문

该文旨在探讨干旱缺水地区长期灌溉条件下,合理解决节水灌溉与冲洗灌溉间矛盾的途径,为在该地区实施节水灌溉战略提供理论依据.采用修正的对流扩散模型(SOTR)及特征有限元方法对中国内蒙古河套灌区冲洗-蒸发条件下的冲洗定额进行数值模拟研究.并用γ射线测定土柱土壤水盐运移结果标定了数值模拟结果.重点分析了基于土壤水动力学与溶质动力学原理,再灌溉冲洗与再分配条件下,均质垂直剖面上溶质运移过程;长期灌溉条件下,干旱地区土壤盐分布与冲洗定额、初始土壤盐分含量、地下水位埋深及地下水矿化度间的内在联系;在此基础上,确定节水灌溉条件下河套灌区最优的冲洗定额.该成果对于促进该地区农业可持续发展具有一定的指导意义.
해문지재탐토간한결수지구장기관개조건하,합리해결절수관개여충세관개간모순적도경,위재해지구실시절수관개전략제공이론의거.채용수정적대류확산모형(SOTR)급특정유한원방법대중국내몽고하투관구충세-증발조건하적충세정액진행수치모의연구.병용γ사선측정토주토양수염운이결과표정료수치모의결과.중점분석료기우토양수동역학여용질동역학원리,재관개충세여재분배조건하,균질수직부면상용질운이과정;장기관개조건하,간한지구토양염분포여충세정액、초시토양염분함량、지하수위매심급지하수광화도간적내재련계;재차기출상,학정절수관개조건하하투관구최우적충세정액.해성과대우촉진해지구농업가지속발전구유일정적지도의의.
The leaching requirement for the Hetao Irrigation District of Inner Mongolia Autonomous Region, China, was estimated by numerical simulation. To simulate the salt transfer under leaching-evaporation conditions, a modified solute transport model, Second-Order model compared with Two-Region model(SOTR), was employed. An advanced numerical method, the characteristics method combined with the finite element(CMCFE) scheme, was used. The simulation was verified by experiment of soil-water transport in the soil column using a Gamma-ray method. The salt transport processes were investigated when solutes leach and redistribute through a vertical homogeneous soil based on the soil water and solute dynamics. The relationship between the dynamic long term distributions of soil salt content and the leaching requirement, ground water depth, ground water salt concentration and initial soil salt content distribution in an arid area was discussed and analysed. And the optimum leaching requirement for the Hetao Irrigation District was determined.