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      當前位置:科學網首頁 > 基金首頁 > 干旱盆地排泄區地下水密度增加對區域水流系統削弱機制研究

      國家自然科學基金項目查詢

      干旱盆地排泄區地下水密度增加對區域水流系統削弱機制研究

      批準號41702282 學科分類地下水環境 ( D070202 )
      項目負責人郝奇琛 負責人職稱助理研究員 依托單位中國地質科學院水文地質環境地質研究所
      資助金額22.00
      萬元
      項目類別青年科學基金項目 研究期限2018 年 01 月 01 日 至
      2020 年 12 月 31 日
      中文主題詞地下水循環;地下水流系統;變密度流;地形驅動;內陸盆地
      英文主題詞groundwater circulation;groundwater flow system;variable density flow;topography-driven;inland basin

      摘要

      中文摘要 內陸干旱盆地地下水通常以蒸發形式排泄,強烈蒸發濃縮作用導致水化學組分在排泄區富集,流體密度發生極大變化,這種變化是否會對地下水流系統產生反作用,以及其作用機制是急需解決的關鍵問題。申請項目將以柴達木盆地典型剖面為例,利用調查獲取的數據和歷史資料,分析水化學組分和密度的空間分布規律及其控制作用;建立變密度流數值模擬模型,采用多源數據對模型進行校正,模擬分析排泄區密度變化對水動力場及水化學場的影響規律;構建密度對地形驅動力削弱程度的定量表征方法,結合模擬的水動力場與密度分布情況,定量計算流體密度增加對地形驅動力的削弱程度;最后采用敏感性分析方法,對影響削弱程度的不確定性因素進行分析,通過以上問題的研究,有望揭示排泄區地下水密度增加對區域水流系統的削弱機制。本項目的開展將有助于完善對內陸盆地地下水流系統控制因素的認識;有利于促進變密度地下水流系統理論的發展。
      英文摘要 Evaporation is one of the main discharge ways of groundwater in arid basins. Intensive evaporation lead to enrichment of components and large variation in groundwater density. Dose that change inversely affect the groundwater flow system and the mechanism is a scientific problem that need to be resolved. In the proposed project, some cross-sections in the Qaidam basin is taken as the study area. Utilizing the new survey data and historical materials, the distribution characteristic of water component, density and its correlation will be analyzed. A variable-density flow numerical model would be developed and calibrated by multi-source data. Using the model, the effect of density variation in discharge area on the hydrodynamic and chemical field will be simulated and studied. Then a representation model of weakening degree of topography-driven force will be established. Based on the simulation results, the weakening degree due to density increasing of groundwater will be calculated. At last, by using parameter sensitivity analysis method, the uncertainty of some factor influence the weakening degree will be studied. Through the studies mentioned above, the weakening mechanism of groundwater density on the regional flow system in arid basins could be revealed. The project proposed would be benefit to understanding of the driving force of groundwater flow system, and promote the development of the theory of groundwater flow system.
      結題摘要

      成果

      序號 標題 類型 作者

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