Global curve-fitting for determining the hydrogeological parameters of leaky confined aquifers by transient flow pumping
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ORIGINAL PAPER
Global curve-fitting for determining the hydrogeological parameters of leaky confined aquifers by transient flow pumping test Peiyue Li & Hui Qian
Received: 4 February 2012 / Accepted: 13 March 2012 / Published online: 17 April 2012 # Saudi Society for Geosciences 2012
Abstract Proper management of groundwater resources requires an accurate evaluation of the parameters (hydraulic properties) that control the movement and storage of groundwater. Hydrogeological parameters are the basis of groundwater evaluation, modeling, and management and so on. A global curve-fitting method incorporating pumping test data and water table recovery data was introduced in the present study. The principal and procedures of the method were elucidated in detail. The drawdown and recovery data from two sets of transient flow pumping test conducted in no. 2 water source site of Shizuishan city were used to verify the calculation accuracy of the proposed method. The hydrogeological parameters were also estimated with traditional type curve-fitting method on the basis of formula derived by Hantush and Jacob. The hydrogeological parameters calculated by the two methods were compared and the results show that the parameters obtained by the global curve-fitting method are a little bigger than but very close to those obtained by the traditional type curve-fitting method. The proposed method which possesses three major advantages is feasible and reliable in aquifer parameter identification. A comparative study on various methods for parameter identification is required and expected in future study.
P. Li (*) : H. Qian School of Environmental Science and Engineering, Chang’an University, No. 126 Yanta Road, Xi’an 710054 Shaanxi, People’s Republic of China e-mail: [email protected]
Keywords Hydrogeological parameters . Pumping test . Transient flow . Leaky confined aquifer . Groundwater . Global curve-fitting . Well function
Introduction Groundwater, as an important component of water resources, plays an important role in national economic construction and development. In many areas of Asia and the Middle East, intensive aquifer use which has boosted crop production and improved access to relatively clean drinking water has been the single major factor that transformed rural economy in the last 25 years (Van Steenbergen 2006). In China, about one third of the water resource is from fresh groundwater and during the last 20 years, groundwater abstraction has increased at 2 billion cubic meters per year. Over 400 cities in China are exploiting groundwater. Groundwater accounts for 30 % in the urban water supply, especially in North and Northwest China where groundwater accounts for as high as 72 and 66 % of urban water supply, respectively (Liu et al. 2006). However, the irrational use of groundwater has induced many problems such as groundwater table decline, groundwater depletion, groundwater pollution, and soil salinization. Scientific groundwater management and accurate groundwater reevaluation are urgently required. The determina
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