PRELIMINARY ISOTOPIC AND HYDROCHEMICAL FINDINGS OF SURFACE – GROUNDWATER DYNAMICS IN AN URBANIZED WATERSHED, PORTLAND, OR

2019 ◽  
Author(s):  
Michael Tchintcharauli-Harrison ◽  
◽  
Mary Santelmann ◽  
Roy Haggerty
Keyword(s):  
Groundwater Dynamics

Groundwater dynamics at Kīlauea Volcano and vicinity, Hawaiʻi

2021 ◽  
Author(s):  
Shaul Hurwitz ◽  
Sara E. Peek ◽  
Martha A. Scholl ◽  
Deborah Bergfeld ◽  
William C. Evans ◽  
...  
Keyword(s):  
Kilauea Volcano ◽  
Groundwater Dynamics ◽  
Kīlauea Volcano

scholarly journals Modeling an Aquifer: Numerical Solution to the Groundwater Flow Equation

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
V. Vázquez-Báez ◽  
A. Rubio-Arellano ◽  
D. García-Toral ◽  
I. Rodríguez Mora
Keyword(s):  
Stationary Flow ◽  
Flow Equation ◽  
Computational Tool ◽  
Groundwater Dynamics ◽  
Isotropic Media ◽  
Groundwater Flow Equation ◽  
The Finite Difference Method ◽  
Anisotropic Soil ◽  
Constant Slope

We present a model of groundwater dynamics under stationary flow and, governed by Darcy’s law of water motion through porous media, we apply it to study a 2D aquifer with water table of constant slope comprised of a homogeneous and isotropic media; the more realistic case of an homogeneous anisotropic soil is also considered. Taking into account some geophysical parameters we develop a computational routine, in the Finite Difference Method, which solves the resulting elliptic partial equation, both in a homogeneous isotropic and in a homogeneous anisotropic media. After calibration of the numerical model, this routine is used to begin a study of the Ayamonte-Huelva aquifer in Spain, a modest analysis of the system is given, and we compute the average discharge vector as well as its root mean square as a first predictive approximation of the flux in this system, providing us a signal of the location of best exploitation; long term goal is to develop a complete computational tool for the analysis of groundwater dynamics.

scholarly journals Distributed groundwater recharge potentials assessment based on GIS model and its dynamics in the crystalline rocks of South India

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fauzia ◽  
L. Surinaidu ◽  
Abdur Rahman ◽  
Shakeel Ahmed
Keyword(s):  
Groundwater Recharge ◽  
Groundwater Exploration ◽  
Crystalline Rocks ◽  
Entire Area ◽  
Cropping Patterns ◽  
Support Tool ◽  
Recharge Potential ◽  
Groundwater Dynamics ◽  
Potential Recharge

AbstractExtensive change in land use, climate, and over-exploitation of groundwater has increased pressure on aquifers, especially in the case of crystalline rocks throughout the world. To support sustainability in groundwater management require proper understating of groundwater dynamics and recharge potential. GIS based studies have gained immense popularity in groundwater exploration in recent years because they are fast and provide recent information on the resource for future growth. Thus, the present study utilized a GIS-based Weighted Overlay Index (WOI) model to identify the potential recharge zones and to gain deep knowledge of groundwater dynamics. The in situ infiltration tests have been carried out, which is the key process in groundwater recharge and is neglected in many cases for WOI. In the WOI, ten thematic layers from the parameters influencing and involved in the recharge process are considered to identify potential recharge zones. The results suggested a significant underestimation of recharge potential without considering site-specific infiltration rates that one needs to be considered. The present WOI model considered in situ infiltration information and classified the entire area into four recharge zones, good, moderate, poor, and very poor. The final integrated map compared with the real-time field data like water level fluctuation and infiltration to analyse occurrence and quantification of recharge. The estimated average groundwater draft is 21.9 mcm, while annual renewable recharge is only 5.7 mcm that causing a continuous fall of the groundwater table. The study is useful in selecting regions with more focussed recharge studies and suggested the need of reducing groundwater demand by changing cropping patterns through a predictive decision support tool.

scholarly journals Some simple procedures for the calculation of the influence radius and well head protection areas (theoretical approach and a field case for a water table aquifer in an alluvial plain)

2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Alessio Fileccia
Keyword(s):  
Water Table ◽  
Alluvial Plain ◽  
Water Supply Systems ◽  
Groundwater Dynamics ◽  
Small Water ◽  
Radius Of Influence ◽  
Head Protection ◽  
Influence Radius ◽  
Supply Systems ◽  
General Explanation

The paper describes some simple methodologies for the delineation of well-head protection areas, together with an overview of the main regulations published in Italy and Europe. Starting from a general explanation of the main parameters, like the radius of influence and the zone of capture in homogeneous isotropic aquifers, basic methodologies suggested in the literature are then illustrated. Different criteria are involved: from the simple 200 m radius, to more complex analytical and numerical simulations. Five different approaches are applied and compared, to a well field in a water table aquifer along a river. Results have shown that, while simpler methods can be satisfactory at a first stage of the study, they fail to account correctly, for local heterogeneities. On the other hand the more accurate description of the aquifer obtained with a full numerical model requires extensive time, expertise and amount of data, that are not always available in case of small water supply systems. As many Authors have underlined, one of the most effective outcome of the numerical tool, lays in the capability to increase our knowledge on the groundwater dynamics of the system and the amount of the sustainable yield.

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