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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/80432

    Title: 應用雙通道微模型探討空氣殘餘型態對新舊水互動的影響
    Authors: 黃鈞琮;Huang, Jyun-Cong
    Contributors: 水文與海洋科學研究所
    Keywords: 微模型;新舊水;角落流;micro model;new old water;corner flow
    Date: 2019-08-22
    Issue Date: 2019-09-03 14:30:11 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 非飽和層中原有殘餘水( “舊水” )的多寡與分佈影響著降雨入滲、灌溉、滲漏等入侵此區域之水( “新水” )的分布型態,且地表下新舊水的互動也影響著地下水水質。
    ;The unsaturated zone is an important part of the path for surface water entering groundwater. The amount and location of the residual water (old water) in the vadose zone affects the infiltration of invading water ( new water, e.g., that from rainfall, stream flow, and irrigation water etc.).
    In this study, I showed the interaction between "old water" and "new water" under different pumping rates, geometry factor and evaporation level of old water, by using pore doublet micromodel experiment. Air entrapment is a key directly separating the new and old water, and promoting "old water" remaining.
    I focus on the air entrapment and what influence on "new and old water interplay". The experimental results show that the evaporation process changes the position of the old water and enhances the air-bubble trapping. The air bubble entrapment reduces the new-old water interplay. And in that case, the new water can only contacted with the old water by corner flow. Under high injection flow rate, the old water and air bubbles were pushed out of the tube before the new water contacted the old water by corner flow. The old water would not be pushed until the capacity up than 50μL/min. This study shows that the evaporation process has a significant effect on the air-bubble trapping. The air bubble reduces the chance of the new-old water mixing. In addition, the corner flow is the path for new water intruding and mixing with the old water.
    Appears in Collections:[水文與海洋科學研究所] 博碩士論文

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