Gain refined understanding of the processes used to evaluate groundwater/surface water interactions, an increasingly timely topic, during this two-day NGWA short course.
Groundwater and surface water are an interconnected water resource. In particular, groundwater and surface water interactions are complex, being controlled by numerous variables that may change spatially and temporally. As interest in groundwater and surface water interactions is increasing in response to limited water resources, sediment combination, and climate change, refined understanding of the processes at the groundwater/surface water interface is critical.
The objectives of this short course are to present scientific methods and regulatory conditions associated with the groundwater/surface water interface. This interface is dynamic in nature, reflecting both groundwater discharge and recharge conditions. Methods to measure and mathematically describe the conditions and processes at the interface will be presented.
The course will entail two days of study. The first day will present and implement field methods. The field work will apply piezometers, permeameters, and seepage meters to measure the flux in the groundwater/surface water interface. Other field methods will be discussed and implemented to characterize the water quality conditions at the interface.
Data from the first day will be utilized in the second day, which will focus on application of mathematical methods to quantitatively characterize the groundwater/surface water interface. The initial section of the session will include a description of commonly used analytical and numerical approaches to assess groundwater flux and hydraulic movement between surface water and groundwater. The second portion of the session will discuss methods to evaluate the attenuation capacity in the zone of surface water/groundwater interaction.
This two-day short course will provide you an introduction to the important geochemical processes that affect groundwater composition and methods for developing reasonable conceptual models using site-specific data. Conceptual models will also be combined with an equilibrium modeling code to produce a geochemical model of a site.
The geochemical processes that affect rviewthe composition of natural groundwater and the movement of groundwater contaminants include a wide variety of solid phase/water and gas interactions in the subsurface. It is oftentimes impossible to predict the impact of these interactions on groundwater composition without a realistic conceptual geochemical model of the system and a means to calculate the interdependent chemical reactions.
This course will strengthen your understanding of the fate and transport of groundwater contaminants, and provide you with techniques and software for using site data to develop geochemical models for a given site. In addition to site understanding, geochemical models can be used in a predictive mode for evaluating natural attenuation of contaminants and designing in situ and ex situ remediation methods.
You will receive an introduction to groundwater geochemistry and chemical reaction modeling using PHREEQCI (free, widely used USGS code) for natural and contaminated systems. Emphasis will be placed on inorganic reaction modeling involving major ions and trace metals. Each session will include a discussion of an important geochemical process (such as mineral dissolution/precipitation, oxidation/reduction, or adsorption/desorption) and a demonstration of modeling the process with PHREEQCI. Practice sessions will integrate examples presented in lectures into realistic problems to provide valuable experience in modeling at specific sites.