The Estimation of Relative Hydraulic Conductivity in the Unsaturated Zone of Using Relative Electrical Conductivity

瀏覽統計 Email 通知 RSS Feed

簡歷

基本資料

Project title

Code/計畫編號

MOST105-2116-M019-005

Translated Name/計畫中文名

利用相對導電度量測推估未飽和層相對水力傳導係數之研究

Project Coordinator/計畫主持人

Yung-Chia Chiu

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=11894005

Year

2016

Start date/計畫起

01-08-2016

Expected Completion/計畫迄

31-07-2017

Bugetid/研究經費

1413千元

ResearchField/研究領域

地球科學

"未飽和層土壤為一多相系統，其複雜之物理與化學反應環境，使得未飽和層內流體流動特性與溶質傳輸機制至今仍無法完全釐清。未飽和層的水力傳導係數為一非常重要之參數，其控制了未飽和層內流體的流動，進而影響了溶質傳輸過程，由於未飽和層水力傳導係數非一固定不變之參數，其值受土壤體積含水量與毛細壓力高低的影響，欲準確獲取此參數為一項非常艱困的任務。至今為止，依然尚未有一個適用的方法可提供在現地尺度下未飽和水力傳導係數、張力、飽和度間之關係。孔隙介質中，導電度主要肇因於孔隙間流體中離子間的傳導，孔隙間的連結性則決定了導電度與水力傳導係數高低，任何造成孔隙間連結性改變的因素皆會改變導電度與水力傳導係數。若相對水力傳導係數（relative hydraulic conductivity）與相對導電度（relative electrical conductivity）之間存在一直接關係，透過影響因子之研析，進而建立簡單容易使用的關係式，將有助於準確且快速的獲得未飽和層水文地質參數。本計畫驥望藉由理論推導、實驗結果與數值模擬，嘗試建立相對水力傳導係數與相對導電度間之直接關係式。此外，透過自製研發的多功能智慧型土壤入滲儀，進行現地的實際量測，搭配室內實驗所推導之關係式，嘗試建立一適用於現地尺度之水力傳導係數與導電度之關係式。""The unsaturated soil is a multi-phase system and the embedded physical mechanisms and chemical reactions are very complicated. The characteristics of groundwater flow and mechanisms of mass transport are still ambiguous so far. Hydraulic conductivity (K) in the unsaturated zone is an important parameter and it controls the flow system and then affects the processes of solute transport. However, unsaturated K is not a constant and varies with effective satuation and pressure. Up to date, there is no robust approach which can provide the explicit relations of unsaturated K, pressure, and saturation in the field. In porous media where the electrical conductivity (EC) is primarily due to ionic conduction through the bulk pore fluid, the connectivity of the pore fluid is the dominant factor determining both hydraulic and electrical conductivity; any change in the material that would change the connectedness of the pore space would change both hydraulic and electrical conductivity. If a direct relationship existed between relative K and relative EC, a simple and useful relationship between the two can be established through the exploration of many factors which would affect this relationship. Therefore, through theoretical analysis, laboratory experiments, and numerical simulation, a direct relationship between relative K and relative EC will be established in this study. An experiment of using self-developed multi-function smart field lysimeter will also be conducted in situ, and an appropriate relationship between relative K and relative EC in the field will also be established by incorporating with laboratory results in this study."

Keyword(s)

未飽和層
水力傳導係數
導電度
砂箱實驗
數值模擬
unsaturated zone
relative hydraulic conductivity
electrical conductivity
sandbox experiment
numerical simulation

DSpace CRIS

The Estimation of Relative Hydraulic Conductivity in the Unsaturated Zone of Using Relative Electrical Conductivity

基本資料

Description