نتایج جستجو برای ' Groundwater '

Due to possibility of water resources pollution by anthropogenic activities, defining groundwater protection zone mainly in karstic carbonate systems is very important. In the following study, the vulnerability map of the karstic enviroment in Kharket region has been prepared with COP and PaPRIKa methods. The COP method is multiattribute method of vulnerability mapping which takes into account hydrogeological, geomorphological and geological condition of the system through three "C, O and P...

DRASTIC model is the most widely used method for aquifer vulnerability mapping which consists of seven hydrogeological parameters. Despite of its popularity, this technique disregards the effect of regional characteristics and there is no specific validation method to demonstrate the accuracy of this method. The main goal of this research was to develop an integrated GIS-based DRASTIC model, to assess its performance, and to modify it in order to obtain a more reliable and accurate model. The or...

In this study, nudging data assimilation algorithm is used to estimate unknown pumping rate in a part of Shabestar plain. Nudging data assimilation algorithm uses the observed measured data of hydraulic head to physical interpretation in order to identify pumping rate. The additional sink and source term is added to the original equation in order to treat the unknown pumping rate. The algorithm identifies the unknown pumping rate and at the same time reduces the forecast error in hydraulic head....

Population growth and the need for supplying healthy and quality drinking water are considered as the most important concerns of today’s societies. Due to locating on arid and semi-arid belt of the world and lack of precipitation, Kerman Province is faced with severe restrictions on access to surface water resources, which has led to uncontrolled exploitation of groundwater resources, which in turn has a negative effect on the mentioned resources. The present study focused on hydro chemica...

A nonlinear minimization problem ‖F(d)−u‖⟶min, ‖u−uδ‖≤δ, is a typical mathematical model of various applied inverse problems. In order to solve this problem numerically in the lack of regularity, we introduce iteratively regularized Gauss–Newton procedure with a nonlinear regularization term (IRGN–NRT). The new algorithm combines two very powerful features: iterative regularization and the most general stabilizing term that can be updated at every...

 Coupled hydrogeological-thermal simulation of the Standing Column Well (SCW) system is essential to provide an optimized configuration and operation schedule for boreholes on the site. This paper presents numerical investigations and thermo-hydraulic evaluation of standing column well system operating under cyclic flow regime. A three-dimensional numerical model for groundwater flow and heat transport is used to analyze the heat exchange in the ground. The model includes the effects of con...

 The land subsidence due to groundwater exploitation has an obvious hysteretic nature with respect to the decrease of the under groundwater level, and the uneven settlement often causes ground fissures. To study these important features, a visco-elastic-plastic constitutive relationship with consideration of the coupling of seepage and soil deformation is proposed, and a finite element model with variable coefficients based on the Biot's consolidation theory is built. With the groundwater e...

 Available analytical models for the thermal analysis of ground source heat pumps (GSHPs) either neglect groundwater flow or axial effects. In the present study a new analytical approach which considers both effects is developed. Comparison with existing analytical solutions based on the finite and infinite line source theory is carried out. This study shows that in general the heat transfer at the borehole heat exchanger (BHE) is affected by groundwater flow and axial effects. The latter i...

 For appropriate management of available groundwater, the flow behavior in the porous media has to be analyzed. The complex problem of groundwater flow can be studied by solving the governing equations analytically or by using numerical methods. As the analytical solutions are available only for simple idealized cases, numerical methods such as finite difference method (FDM) and finite element method (FEM) are generally used for field problems. Meshfree (MFree) method is an alternative nume...

 A rapid zero-valent iron (Fe0) target reduction reaction in groundwater remediation and wastewater treatment is commonly pursued. However, the economic importance of chemical consumption efficiency was ignored. In this study, we introduced a new economy-based factor of electron efficiency (EE) defined as the percentage of electrons utilized in a target reduction over an entire consumption at a given time interval. A measurement strategy was established and performed in batch experiments us...