日本地球惑星科学連合2018年大会

講演情報

[EJ] ポスター発表

セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

[A-HW23] 流域の地下水・地表水における滞留時間と水・物質循環プロセス

2018年5月24日(木) 15:30 〜 17:00 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:辻村 真貴(筑波大学生命環境系)、水垣 滋(国立研究開発法人土木研究所寒地土木研究所)、勝山 正則(京都大学農学研究科、共同)、Gusyev Maksym(International Centre for Water Hazard Risk Management, Public Works Research Institute)

[AHW23-P03] Approximate solutions for drawdown and wellbore flowrate due to constant-head pumping for flow with considering skin effect

*Chia-Hsin Yen1Ye-Chen Lin1Shaw-Yang Yang2Hund-Der Yeh1 (1.National Chiao Tung Univ.、2.Vanung Univ.)

キーワード:constant-head pumping, partial penetrating well, skin effect, approximate solution

A variety of mathematical models describing groundwater flow due to constant-head pumping (CHP) in a confined aquifer had been proposed. The predicted drawdown or wellbore flowrate from the solution of the model may be overestimated or underestimated when a skin zone is present around the wellbore but neglected. If the skin has a finite thickness and the flow in the skin zone is included in the mathematical model, its solution is then referred to as two-zone solution (TZS). In contrast, it is named as skin-factor solution (SFS) if the skin properties are lumped as a factor in the model. The TZS is much more complicated and difficult to evaluate than the SFS. Therefore, this study aims at developing a novel SFS based on a steady-state groundwater equation with time-dependent outer boundary for CHP tests with a partially penetrating well in a confined aquifer. The results from this new SFS show good match in the drawdown and wellbore flowrate with the TZS. Moreover, the present SFS coupled with the simulated annealing algorithm is used to analyze field observed data from a CHP test for the estimation of the aquifer parameters. The result demonstrates that the new SFS has merits of good accuracy and less computing time in the parameter estimation.