Conference program and abstracts - Coastal-Change.Org
Conference program and abstracts - Coastal-Change.Org Conference program and abstracts - Coastal-Change.Org
Seawater Intrusion Due to Temporal Rainfall and Landuse Changes in Coastal Aquifer, North of Chennai, Tamil Nadu, India S.P.Rajaveni and L.Elango Department of Geology, Anna University, Chennai – 25 ABSTRACT Climate and landuse changes are the important factors to affect the quantity and quality of groundwater in coastal aquifers. Generally coastal aquifer delivers large quantity of fresh water for many purpose including domestic water supply, irrigation of crops and industrial activities. India has 7000km of coast line, where Chennai metropolitan city located in east coast line with population of 5 million (Census of India, 2012) exclusive of a perennial source of drinking water. Hence groundwater is the major source of city water supply, which withdrawn 148 MLD (CMWSSB) mainly from well-fields in the Araniyar-Kortalaiyar basin, North of Chennai. Population increases, climate change and landuse changes in this area creates overexploitation of groundwater from coastal aquifer with less groundwater recharge causes movement of seawater towards land. Groundwater recharge is based on the climatic variables of precipitation and temperature. Study area covered 603 km 2 has two major rivers of Arani and Koratalaiyar. Rainfall from 2001 to 2011 at three stations of Ponneri, Chozhavaram and Vallur anicut were analysed for climate change. Maximum of 2000 mm and second highest rainfall of 1762 mm measured in the Ponneri and vallur anicut during 2001, 2005 and 2010. Lowest rainfall of 500 mm measured in the Ponneri station from 2002 to 2004, which decreasing the amount of groundwater recharges and increasing the movement of seawater. Landuse changes are identified from LISS III imagery from 2003 to 2008. Agricultral land is decreasing from 368 km 2 to 350 km 2 and increasing of built-up land from 70 km2 to 88 km2 due to saltwater intrusion along north Chennai coast. Hence climate changes decreasing the amount of groundwater recharge resources, which is affected the landuse pattern in this area. These are some factors for saltwater intrusion in North Chennai. The Fourth IGCP 588: PREPARING FOR COASTAL CHANGE 39
Evaluation of the Impact Assessment of Coastal Environment off Gulf of Mannar Judith D. Silva 1 , S.Srinivasalu 1* , P.Saravanan 2 1, 2, 1* Department of Geology, Anna University, Chennai- 600025 ABSTRACT The Gulf of Mannar is a transitional zone between the Arabian Sea and Indian Ocean proper and is connected with the Bay of Bengal through a shallow sill, the Palk Strait. The 21 islands between Thoothukudi and Rameswaram shores in the Gulf of Mannar are notified as the first Marine Biosphere Reserve of India. The regions around the Thoothukudi shores are home to rare marine flora and fauna. Coral reefs and pearl oysters are some of the exotic species while algae, reef fish, holothurians, shrimps, lobsters, crabs and Mollusca are very common( Sacratees and Karthigarani 2008) (Hirway et al 2007). The thermal discharge from the thermal plants and excessive brine run off from the salt pans impact the flora and fauna in the region to a large extent ( Sacratees and Karthigarani 2008) (Ramakrishnan Korakandy 2008). As per the overall industrial scenario, many large and small-scale industries have developed along the coastal zone in recent years. So there is a necessitate to study the current status of this environment. The Gulf of Mannar is influenced by both southwest and northeast monsoons and hence the physical, chemical and biological characteristics are different from other areas. The area under investigation off Tuticorin in the Gulf of Mannar presents great interest because it is an industrial belt consisting of many major industries involving in the production of chemicals, petrochemicals and plastics. This study mainly focuses on assessing the quality of this coastal environment and highlights the role of marine sediments in pollution studies. The quantification of such processes is important for geochemical studies and prediction of the fate of environmental contaminants. Various geochemical proxies are used in predicting the fate of the naturally enriched environment. Taking into account various environments the values are within the permissible standards except for some cases like TDS, total hardness, chloride, etc. Taking in to account the marine environment, sediment part plays a major role in assessing the status of the environment. Al is used as a normalizer to calculate the enrichment of trace metals indicating that the high values (EF>1.5) are due to the anthropogenic addition of metals to the system. Enrichment Factor (EF) values greater than 1 can be well thought out to be attributed to long transportation phenomenon from natural or manmade sources and not from crustal background (Nolting et al, 1999). Metals like Cr, Cu, Pb, Sr and Zr shows high enrichment. The Geoaccumulation index (Igeo) based on shale values (Wedepohl 1995) showed hike for metals particularly Cr, Cu, Pb, Sr and Zr. All these indices strongly indicate that this area is highly polluted due to the anthropogenic influence and these prevailing conditions should be controlled or should be reduced to certain extent to protect the Mother Nature with all her inborn beauties. Though this environment is polluted with all these parameters, this region is a rich bio reserve and out of all the affecting factors, this environment is capable of sustaining its own nature’s beauty. So periodical monitoring steps should be implemented to protect this naturally enriched environment. 40 The Fourth IGCP 588: PREPARING FOR COASTAL CHANGE
- Page 12 and 13: CONTENT Tsunami history along the c
- Page 14 and 15: A Methodology to Develop a Report C
- Page 16 and 17: Tsunami history along the coastline
- Page 18 and 19: 2004 Tsunami and Tsunamigenic sedim
- Page 20 and 21: Coastal resilience on microbial pol
- Page 22 and 23: Hazard Line Mapping Of Mahadi Delta
- Page 24 and 25: Millennial-scale records of North A
- Page 26 and 27: Indian Southwest Monsoon Variabilit
- Page 28 and 29: Coastal wind climate, coastal dunes
- Page 30 and 31: Benthic Foraminifera and siltation
- Page 32 and 33: Wetland Ecosystem of Mahanadi Delta
- Page 34 and 35: pollen and charcoal concentration,
- Page 36 and 37: Palaeo-environmental reconstruction
- Page 38 and 39: Vulnerable Deltas of Indian Coast P
- Page 40 and 41: The Coastal and Marine Tourism of E
- Page 42 and 43: Mangroves and Coastal Changes in In
- Page 44 and 45: Investigating inter--‐annual and
- Page 46 and 47: High Resoluation Holocene Climatic
- Page 48 and 49: Geochemical characteristics of surf
- Page 52 and 53: Mineral magnetic study of coastal s
- Page 54 and 55: Phosphorus dynamics of water - sedi
- Page 56 and 57: Evaluation of major hydrogeochemica
- Page 58 and 59: A Methodology to Develop a Report C
- Page 60 and 61: Seaweeds culture and its impacts on
- Page 62 and 63: An Environment Management Plan In A
- Page 64 and 65: Subsurface Geomorphological Study o
- Page 66 and 67: Morphosedimentary evidences of rapi
- Page 68 and 69: Hydrogeochemical assessment of huma
- Page 70 and 71: Sea Surface Height (SSH)-based Pote
- Page 72 and 73: Tropical storm off Myanmar coast sw
- Page 74 and 75: Integrated approach for assessment
- Page 76 and 77: Need for evolutionary studies in An
- Page 78 and 79: Integrated Coastal Zone Management
- Page 80 and 81: Assessment Over Impacts Of Sealevel
- Page 82 and 83: Holocene sea-level changes in the c
- Page 84 and 85: Evidence of Holocene flooding-storm
- Page 86 and 87: Study of Wave Parameters along the
- Page 88 and 89: Shore Specific Sediment Characteris
- Page 90 and 91: occurrences of microfossils. In the
- Page 92 and 93: Vulnerability assessment of the sou
- Page 94 and 95: Artificial Coastal Lakes (Paleo-lag
Seawater Intrusion Due to Temporal Rainfall <strong>and</strong><br />
L<strong>and</strong>use <strong>Change</strong>s in <strong>Coastal</strong> Aquifer, North of Chennai,<br />
Tamil Nadu, India<br />
S.P.Rajaveni <strong>and</strong> L.Elango<br />
Department of Geology, Anna University, Chennai – 25<br />
ABSTRACT<br />
Climate <strong>and</strong> l<strong>and</strong>use changes are the important factors to affect the<br />
quantity <strong>and</strong> quality of groundwater in coastal aquifers. Generally coastal<br />
aquifer delivers large quantity of fresh water for many purpose including<br />
domestic water supply, irrigation of crops <strong>and</strong> industrial activities. India<br />
has 7000km of coast line, where Chennai metropolitan city located in<br />
east coast line with population of 5 million (Census of India, 2012)<br />
exclusive of a perennial source of drinking water. Hence groundwater is<br />
the major source of city water supply, which withdrawn 148 MLD<br />
(CMWSSB) mainly from well-fields in the Araniyar-Kortalaiyar basin, North<br />
of Chennai. Population increases, climate change <strong>and</strong> l<strong>and</strong>use changes<br />
in this area creates overexploitation of groundwater from coastal aquifer<br />
with less groundwater recharge causes movement of seawater towards<br />
l<strong>and</strong>. Groundwater recharge is based on the climatic variables of<br />
precipitation <strong>and</strong> temperature. Study area covered 603 km 2 has two<br />
major rivers of Arani <strong>and</strong> Koratalaiyar. Rainfall from 2001 to 2011 at three<br />
stations of Ponneri, Chozhavaram <strong>and</strong> Vallur anicut were analysed for<br />
climate change. Maximum of 2000 mm <strong>and</strong> second highest rainfall of<br />
1762 mm measured in the Ponneri <strong>and</strong> vallur anicut during 2001, 2005 <strong>and</strong><br />
2010. Lowest rainfall of 500 mm measured in the Ponneri station from 2002<br />
to 2004, which decreasing the amount of groundwater recharges <strong>and</strong><br />
increasing the movement of seawater. L<strong>and</strong>use changes are identified<br />
from LISS III imagery from 2003 to 2008. Agricultral l<strong>and</strong> is decreasing from<br />
368 km 2 to 350 km 2 <strong>and</strong> increasing of built-up l<strong>and</strong> from 70 km2 to 88 km2<br />
due to saltwater intrusion along north Chennai coast. Hence climate<br />
changes decreasing the amount of groundwater recharge resources,<br />
which is affected the l<strong>and</strong>use pattern in this area. These are some factors<br />
for saltwater intrusion in North Chennai.<br />
The Fourth IGCP 588: PREPARING FOR COASTAL CHANGE 39
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