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Geoscience e-Journals





An International Year of Planet Earth-2008 Initiative

Current Issue Technical

Year 2020

Volume 13 (3)

Evaluating the Effect of Land-Use Change Coupled with Climate Change: A Study based on Sal River Flow in Goa, India
Ashwini Pai Panandiker1, Shubham Gude2, A.G. Chachadi3, Mahender Kotha4
There is a constant conflict for water amongst various sectors. This is further aggravated by climate change. It is crucial to establish interaction between land-use combined with climate change and local hydrology to devise sustainable management strategies. This study used the Norwegian Earth System Model (NorESM) climate model, Land Change Modeler (LCM) and Soil and Water Assessment Tool (SWAT) hydrological model. This ensemble of models was used to predict Sal River flow in Goa, India under two Representative Concentration Pathway (RCP 4.5 and 8.5) climate scenarios. The statistically tested results indicate that the future rainfall and temperature is likely to increase and more pronounced under RCP 4.5 scenario. However, climate combined with land-use change reveals that the streamflow is likely to increase with increase in the urban/concrete areas and decline with reduction in the forest areas. For Sal River watershed, the forest cover is likely to decrease by 5.93% up to 2040s, with a corresponding increase in the urban/settlement areas. With the increase in the built-up areas, the surface runoff may increase and lead to an urban flooding-like situation. Dependable flows for this watershed were computed to comprehend future water availability. Site-specific recommendations have been formulated to aid the decisionmakers to implement the timely adaptation measures. 

Keywords: Climate change, NorESM model, Land Change Modeler, SWAT model, Sal River, Goa
Distribution of Sedimentary Diatoms of Ooty Lake, Nilgiris District, Tamil Nadu, India: Implication on Water Quality Assessment using the Principal Component Analysis (PCA)
S. M. Hussain1, Samaya S. Humane*2, Sumedh K. Humane2, P. Loganathan1, A. Prem Kumar1 and Shubhangi T. Fulmali1
Abstract Diatoms occur in all natural conditions in lake and their distribution is mainly governed by the physicochemical composition of the water. Monitoring of water quality with physicochemical parameters is insufficient. Organic indicators of water quality monitoring used during the recent years have served as excellent tools in the areas of water pollution studies. Among all the fresh water organisms, diatoms are the most commonly used indicators of the water quality changes and paleoenvironments. In the present study, a total of 23 species distributed among 13 genera were recorded from the surface (grab) sediments of the Ooty Lake. Among these, the most abundant are Ulneria ulna, Cyclotella meneghiniana, Hantzschia amphioxys, Gomphonema affine, Aulacoseira granulata, Tabularia tabulata and Gomphonema gracile. Sediment samples were analysed for the organic matter, CaCO3, sand, silt and clay content, while water samples for pH, temperature and dissolved oxygen. The present finding mainly deals with the comparative study of diatom assemblages in relation to spatial-temporal changes in the environmental conditions of the Ooty Lake.The utility of the Principal Component Analysis (PCA) relative to diatoms to study the water quality of the Ooty Lake have also beendiscussed in the present work.  
Keywords:  Freshwater diatoms; Distribution; PCA; Ooty Lake; Tamil Nadu; India