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Bhagya Mayadunna

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Integrated Remote Sensing
and
GIS Approach for Demarcation of Groundwater Potential Zones in Ambalantota Divisional Secretariat Division

B.B. Mayadunna - 090831E
DEPARTMENT OF EARTH RESOURCES ENGINEERING

Supervised by:
Dr. D.M.D.O.K. Dissanayake
Mr. I.P. Senanayake (External supervisor)
OUTLINE
INTRODUCTION

GROUNDWATER EXPLORATION METHODS

RS & GIS

GROUNDWATER RECHARGING

RS & GIS
remote sensing

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.
INTRODUCTION
WATER CYCLE
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.
GROUNDWATERVEXPLORATION METHODS
Surface Exploration Methods

Geological methods

Surface Geophysical methods

Remote Sensing and GIS
Subsurface Exploration Methods

Test drilling

Geophysical logging

Tracer test

GIS

is an effective tool for
collecting, storing, transforming, retrieving, displaying and analyzing spatial data from the real world for particular use.

THANK YOU !
REFERENCES
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].
CASE STUDY
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
porosity
permeability
acquifer ?
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
Topography
Lithology
Geological structures
Extent of fractures
Secondary porosity
Slope
Drainage pattern
Landforms
Landuse /land cover
Climatic conditions and interrelationship between these factors

APPLICATION OF REMOTE SENSING AND GIS FOR DEMARCATION OF GROUNDWATER POTENTIAL ZONES

Dr. D.M.D.O.K.Dissanayake
University of Moratuwa
Sri Lanka

STUDY AREA

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


Geology map
Lineament Map
Geormorphology
Drainage density map
Generation of GIS database
Assuming weightage
GIS integration and analysis
Results
Groundwater potential zones
GROUNDWATER RECHARGING
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?

GROUNDWATER EXPLORATION

Artificial recharging
Natural recharging
DATA
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
Field data

Slope map
Rainfall map
Aspect map
Objectives
Full transcript