利用地下水水流儀來調查地下水流場，為近年來於國內的污染場址調查與地下水流場調查之常用儀器，其中熱流式水流儀為常用儀器之ㄧ，其具有簡單與方便之優勢。為探討熱流式水流儀於測量流速與流向之干擾與影響程度，本研究藉由實驗室設計之砂箱試驗，探討海棉濾材、密封環、監測井井篩開孔、地下水水質與比熱四項因子於實驗室砂箱使用熱流式水流儀，流速與流向所造成儀器測量干擾與影響程度，並應用於現場驗證其流速與流向。
由試驗成果顯示，相同規格不同產地之海棉濾材，對於水流儀流速流向之量測誤差範圍影響不大，其流速之差異約為10%以內，流向差異為10度以內，而儀器測得之流速與流向，差異範圍皆在儀器誤差範圍之內。於有安裝海棉濾材情況下，無密封環測得之流速為有密封環測得之流速值減少約20 ~ 30%，研究亦顯示，監測井之井篩開孔與水流相對位置亦會影響水流流入井管之流況，造成儀器測量之流速有所差異，監測井之井篩開孔與水流相對位置會干擾儀器測量之流向，其影響程度在30度以內。水質鹽水比熱將會影響水流儀流速測量結果，比熱越小則水流儀測得之流速值亦越小。

The groundwater flowmeters in recent years are often used to investigate groundwater flow in pollution site and groundwater flow investigation. The heat-flow flowmeter is one of groundwater flowmeters, which has the superiority of simple and convenience. The thesis is proposed to discuss instrument disturbance and influence of measurement by laboratory sand tank. We focus on four influence factors with sponge filters, packing ring, well screens, as well as groundwater quality and specific heat accompanying with laboratory sand tank. Finally, application on the field site is also presented in order to validate groundwater velocity and direction of measurement of heat-flow flowmeter.
The results show that the measurement variation of groundwater velocity and direction using different sponge filters is insignificant, and the difference of measurement velocity and direction is less 10% and 10 degrees, respectively. It indicated that the measurement difference of velocity and direction is within the instrument error scope. As considering the sponge filter installed, the values of velocity of measurement without packing ring has lower 20 ~ 30% than those with packing ring. It also indicated that the variation of measurement flow direction within the well was related to the relative position between well screens and groundwater direction, and the difference degree of flow direction is less 30 degrees. Furthermore, the variation of measurement velocity within the well was related to the relative position between well screens and groundwater flow. The relative position also affects the situation of water inflow well resulting in the difference of measurement velocity. Since the specific heat of salt water affects the velocity of measurement, the results showed that as the specific heat is smaller, the velocity of measurement is smaller.

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