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GIS Approach for Demarcation of Groundwater Potential Zones in Ambalantota Divisional Secretariat Division
B.B. Mayadunna - 090831E
DEPARTMENT OF EARTH RESOURCES ENGINEERING
Dr. D.M.D.O.K. Dissanayake
Mr. I.P. Senanayake (External supervisor)
GROUNDWATER EXPLORATION METHODS
RS & GIS
RS & GIS
is useful in the search for groundwater prospect zones
it provides the current spatial disposition of basic information on geology, landforms, soils, land use/land cover, surface waterbodies, etc. quickly and reliably
less cost and manpower than conventional techniques.
Satellite data of the Earth’s surface help in demarcating surfacial and sub-surfacial expressions ( lineament, fracture, joints, faults), land use, land cover, etc.
What is Groundwater?
groundwater is water that exists in the pore spaces and fractures in rock and sediment beneath the earth surface
evaporate from oceans, lakes and rivers in to atmosphere
condensations of the vapor and that returns to the ground through precipitation
Out of the precipitation a portion quickly evaporate, somewill run off into streams or rivers, making their way to the ocean and remaining water will percolate into the soil.
Surface Exploration Methods
Surface Geophysical methods
Remote Sensing and GIS
Subsurface Exploration Methods
is an effective tool for
collecting, storing, transforming, retrieving, displaying and analyzing spatial data from the real world for particular use.
THANK YOU !
Panikkar, A.K. (2008) Water profile of Sri Lnaka, 09 Dec, [Online], Available: http://www.eoearth.org/view/article/156991/ [28 May 2013].
R. K. JAISWAL, S. MUKHERJEE, J. KRISHNAMURTHY, R. SAXENA (2001) 'Role of remote sensing and GIS techniques for generation of', International Journal of Remote Sensing, Nov, p. 17.
Senanayake I. P., D. M. D. O. K. Dissanayake, and U. G. A. Puswewala (2012) 'Analysis of the abundance of abandoned tanks in Hambantota District, Sri Lanka using GIS techniques', The Egyptian Journal of Remote Sensing and Space Science.
U.S. Department of the Interior, U.S.G.S. (2013) The World's Water, 23 May, [Online], Available: http://ga.water.usgs.gov/edu/earthwherewater.html [19 Jun 2013].
Porosity of the aquifer is the ratio between void volumes to bulk volume
Primary porosity - original interstices created whenn some rock or soil formed
Secondary porosity - joints, faults in igneous and metamorphic rocks and consolidated sedimentary rocks
Basic principles for groundwater flow
property of the porous medium that measures the capacity and ability of water to flow through the porous medium
The occurrence and movement of groundwater in an area is governed by several factors
Extent of fractures
Landuse /land cover
Climatic conditions and interrelationship between these factors
APPLICATION OF REMOTE SENSING AND GIS FOR DEMARCATION OF GROUNDWATER POTENTIAL ZONES
University of Moratuwa
Greater part of Giri Catchment is lying in middle Himalayas and Shiwaliks.
The study area falls in part of Survey of India toposheet no 53 E/4,8 53 F/1,2,3,5,6,7,9,10 and 11 covering an area about 2684km2 bounded between latitude 30° 25 to 31 °16 N and longitute 77°05 to 77° 39E
Determination of groundwater potential zones in a hard rock tarrain by intergration of thematic maps in a GIS envirnment
Determination of suitable ground water zones for human consumption in the study area
Drainage density map
Generation of GIS database
GIS integration and analysis
Groundwater potential zones
Ground water recharging is a hydrologic process of addition of water from surface to the saturated zone and it can be identified as deep drainage or deep percolation.
Why recharging is important?
Arial Photographs of SOI 53 E/4,8 53 F/1,2,5,6,7,9,10 and 11
IRS ID PAN ,LISS III (31-10-2001) and ETM(15-10-2000) , SRTM data in digittal and hard copy format
Ancilary data and literature