Using Heat and Salt as Groundwater Tracers to Evaluate the Interactions between Surface Water and Streambed and the Application of Fiber-Optic Distributed Temperature Sensor

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Project title

Code/計畫編號

MOST107-2116-M019-002

Translated Name/計畫中文名

利用熱能與鹽水為地下水示蹤劑探討河水與河床交互作用之研究及分散式光纖溫度感測器之應用研析

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=12676698

Year

2018

Start date/計畫起

01-08-2018

Expected Completion/計畫迄

31-07-2019

Bugetid/研究經費

1510千元

ResearchField/研究領域

地球科學

地表水與地下水間之交互作用不僅在水文生態系統中扮演著極為重要的角色，對於整個水文循環，甚至水資源的規劃與管理亦是不可獲缺的一環。在探討地表水與地下水的交互作用時，河水透過河床入滲至地下水中（或地下水透過河床補注至河川）已被公認為水體間流體、營養鹽及生物間交換之重要通道，而河床的物理與化學變化過程與兩者間之水流通量與交互作用有著高度相關。為探討河床內之水流通量及其水力特性，亟需準確、方便、快速的現地量測技術與分析方法，而在眾多方法之中，熱能及鹽水示蹤劑已被視為可靠性極高的量測方法。因此，本計畫驥望藉由現地監測及試驗，以熱能及鹽水作為地下水示蹤劑，並搭配數值模擬的方式探討河水與河床間之交互作用，經由長期的現地水位與水溫監測資料、數據分析及模式模擬，推估河水與河床間之水流通量及河床之水力參數特性，評估以熱能及鹽水作為地下水示蹤劑之可行性，研析不同時間尺度下，溫度差異所造成水流通量解析能力之影響，並嘗試建立現地河水與河床間交互作用之水文循環概念模型。此外，為克服現地溫度量測解析度上的限制，本計畫亦將引進創新的分散式光纖溫度感測器（fiber-optic distributed temperature sensor, FO-DTS）量測技術，並於現地進行量測工作，藉由FO-DTS在空間上連續性量測的優勢，提昇量測資料在空間上的解析能力，同時針對一維及二維模式在應用上之互補性進行探討，評估FO-DTS應用於河水與地下水交交互作用研究之可行性，期最終能推廣FO-DTS的應用至其它水文地質相關領域研究之上。The interactions of surface water and groundwater play an important role not only in the ecohydroloigical system but also in the hydrological cycle and water resources planning and management. When evaluating the surface water and groundwater interactions, the streambed has been considered as a critical pathway for water infiltration, nutrition exchange, and biological activities. The physical and chemical characteristics within the streambed are dominated by the interactions between rivers and streambeds, and their changes are highly related to the water fluxes between these two. In order to estimate the fluxes within the streambed and its associated hydrological characteristics, an accurate, convenient, and fast measured approach to analyze the measurements is needed. Among many measured approaches, energy of heat and chimerical tracer have been considered as robust methods for tracking the groundwater flow. Therefore, the heat and salt are selected as groundwater tracers to evaluate the interactions between river and streambed at the field in this study. The long-term measured data will be analyzed with numerical simulations to estimate the fluxes and associated hydraulic conductivity within the streambed. The amplitudes and peak shifts of a pair temperatures at different time scales will be used to evaluate the capability of temperature measurements when estimating the water fluxes. The conceptual model of hydrological cycle will also be developed and the feasibility of using heat and salt as groundwater tracers for river and streambed interactions will be assessed. Besides, in order to overcome the deployment of limited numbers of sensors, the fiber-optic distributed temperature sensor (FO-DTS) technique will be applied at the field and the measured results will be compared with those obtained from the heat and salt tracer tests. The advantage of FO-DTS in spatial resolution improvement will be evaluated and the complementarity of implementing 1-D and 2-D models will be identified through the FO-DTS data in this study as well. The ultimate goal is to extend the application of FO-DTS to the other hydrogeology related researches.

Keyword(s)

地表水與地下水交互作用
熱能示蹤劑
鹽水示蹤劑試驗
分散式光纖溫度感測器
數值模擬
surface water and groundwater interactions
heat tracer
salt tracer test
fiber-optic distributed temperature sensor
numerical simulation

DSpace CRIS

Using Heat and Salt as Groundwater Tracers to Evaluate the Interactions between Surface Water and Streambed and the Application of Fiber-Optic Distributed Temperature Sensor

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