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Information on Symposia per Science Theme





Theme No.

Theme Title

Number of Symposia proposed

Symposia Title

Symposia Conveners

Biographical sketch of the Conveners

Keywords

Abstract

38

Hydrogeology and Sustainable Development


Prof. L. Elango

elango34@hotmail.com

(India)


Dr. Dipankar Saha

dsaha002@yahoo.com

(India)


Prof. Makoto Taniguchi

makoto@chikyu.ac.jp

(Japan)


6

Mapping, Investigation, Characterising and Management of Aquifers

Dipankar Saha

dsaha002@yahoo.com

(India)



Aquifers store and transmit groundwater. There are different investigation techniques for locating, demarcating and assessing the aquifers. The non-invasive techniques include the hydrogeological, hydro geochemical, geophysical, and interpretation of remotely sensed data etc., while the invasive techniques are drilling and bore well geophysical investigations. Mapping aquifers, characterising its hydraulic properties, groundwater regime behaviour like space-time variation of hydraulic head/heads are of paramount importance in managing this precious groundwater resource. This symposium would deal with different techniques of investigation, their efficacy and case studies in different hydrogeologic framework areas, behaviour of hydraulic regimes in particularly multi-layered aquifer systems, determination and interpretations of aquifer hydraulic parameters, optimum yield, safe yield, controlled groundwater mining in an aquifer. Water well construction and design issues will also be included into this symposium

Ground Water Chemistry and Contamination

L Elango

elango34@hotmail.com

(India)



Groundwater quality is of major concern due to both geogenic and anthropogenic sources of contamination. The depletion of groundwater resources makes it necessary to safeguard the available resources from contamination. Emerging contaminants need to be continuously monitored in groundwater and appropriate water quality standards should be arrived at regular intervals. Hence, recent techniques of water quality assessment, understanding the changes in spatial and temporal groundwater quality, its relation to the aquifer properties including the fracture systems, deep groundwater, interaction between different aquifers, anthropogenic sources etc. will be discussed in this symposium. Not limited to these, all the other aspects related to groundwater quality and environment, geochemical and numerical models will also be addressed.

Managed Aquifer Recharge and Groundwater Resource Sustainability

R C Jain ratan.jain@gmail.com

(India)




Aquifers have become a dependable source of water worldwide. There is an unprecedented increase in extraction of groundwater, both in areas underlying prolific unconsolidated aquifer systems and also in not so potential fractured aquifer systems in consolidated sedimentary and crystalline areas. Over-exploitation of groundwater resources is a common phenomenon now cutting across the basins, countries and continents. One of the main ways to combat over-exploitation is to recharge the aquifers artificially in addition to their natural replenishing capacity through rainfall infiltration. Artificial recharge aims to arrest the overland flow and divert it into the aquifers through some improvised structures. Improvements can be made in the chemical and bacteorological quality of the source water of recharge. This symposium will deal on both the traditional and modern recharge techniques, their efficacy and performance in building up groundwater resource and improvement of water quality.

Fragile Hydrogeology of Coastal, Island and Other Sensitive Areas

Abhijit Mukherjee amukh2@gmail.com (India)




Major part of the world’s population lives in the coastal areas and they depend to a large extent on groundwater. With increasing demand for freshwater, the groundwater pumping is also increased in these areas. Coastal aquifers are particularly sensitive to changes in groundwater extraction as they are generally connected to the sea and groundwater over-pumping may lead to seawater intrusion. In some other regions of the world, a large amount of groundwater gets discharged into the sea. Thus, the submarine groundwater discharge and seawater intrusion are of international research interest. Characterisation, understanding and predicting the future groundwater level in such regions are also essential for the proper management of these aquifers. All aspects related to coastal aquifer characterisation, interaction between multi-aquifers, complex hard rock aquifers, new techniques of identification of interaction between the sea and aquifers, natural and induced tracers, density dependent modelling tools etc. will be considered under this sub-theme.

Deeper and Trans-Boundary Aquifers

Sashank Sekhar sashankshekhar@gmail.com

(India)




The impact of the increase in groundwater extraction is felt immediately in the decline in hydraulic heads of the aquifers. The declining water levels warrant quest for potential zones at greater depths. In arid and semiarid areas, underlain by both the unconsolidated and consolidated formations, the depths of wells are increasing in a rapid pace in last two decades. In some unconsolidated areas, though potential shallow aquifers are available, the deeper aquifers are exploited for better potable groundwater. In unconsolidated multi-tiered aquifer systems, the groundwater at places occurs under tremendous confined condition at deeper levels, even resulting in auto-flow conditions. The deeper aquifers, need to be investigated for their geometry and hydraulic behaviour, chemical quality and extractable volume of groundwater, as it forms a strategic resource. In many a cases the deeper aquifers form transboundary aquifers between river basins, administrative boundaries and countries. In future, with accentuated crisis of water, trans-groundwater issues can flare up. This sub-theme will deliberate on status of knowledge and new findings on deeper aquifers in different parts of the world, groundwater resource availability, vulnerability, and its value as a strategic resource in the scenario of climate change.

Impact of Climate Change on Ground Water

Makoto Taniguchi makoto@chikyu.ac.jp

(Japan)




Climate change is inevitable and has caused variations in recent climatic conditions such as the global atmospheric temperature, extreme precipitation events, sea level rise and heat waves among other effects. Such changes in climate impacts the extraction of groundwater resources and use of nutrients and other chemicals in agriculture. The Intergovernmental Panel on Climate Change predicts that the impact will also be on groundwater quality through increase in the concentration of nutrients, salts, pesticides and pathogens. Regional and local level estimates of these effects should be studied to understand the likely impacts of climate change in the future, as this will assist in planning adaptation measures. All aspects related to the impact of climate change on groundwater resources will be taken up in this symposia.