Tag: erosion

Recent Articles-IJGGS

Erosion susceptibility zoning and prioritization of mini-watersheds using Geomatics approach

Author(s)-Sunil Londhe,Nathawat.M.S, Subudhi.A.

ABSTRACT

Sediment yield data is generally not available for smaller hydrologic units and it becomes difficult to identify the most vulnerable  erosion zone that can be treated on a priority basis. The study area is 163407 ha lies between 23° 13′ 12″N  23° 33′ 1″ N latitude and 85° 10′ 28″ E 85° 54′ 16″ E longitude having 3870 streams linked with 7 order of streams and divided in to 20 mini-watersheds. The evaluation of morphometric and Universal Soil Loss Equation (USLE) parameters using  remote sensing and GIS for prioritization of mini-watersheds in Subranerakha Sub-catchment, Jharkhand, India. Furthermore, attempt was also made to compare the ranks obtained from both parameters to ascertain the validity of ranks of USLE. The ranks of USLE were found more appropriate and are considered for the prioritization of mini-watersheds. Five categories of priority viz., very high, high, medium, low and very low, were used to classify the mini-watersheds. The prioritization results reveal that four mini-watersheds viz. USR7, USR8, USR10 and USR5 fall under the category   of very high priority. The area is grouped in to very severe, moderately severe, moderate, slight and very slight erosion susceptibility zones. GIS and remote sensing based evaluation of morphometric and USLE parameters for ranking them is an immense help in the prioritization of small hydrologic units. Further the technology is helpful in erosion susceptibility zone mapping based on ranks obtained from morphometric and USLE parameters for evaluation of conservation measures for ridge to valley treatment.

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Recent Articles-IJES

Implications of physical parameters and trace elements in surface water off Pondicherry, Bay of Bengal, South East Coast of India
Author(s)- Solai A, Suresh Gandhi M, Sriram E

ABSTRACT

The heavy metals generally, enter the aquatic environment through atmospheric deposition, erosion of geological matrix or due to anthropogenic activities caused by industrial effluents, domestic sewage and mining wastes. The main objectives of this paper is to understand the processes controlling major and trace elements in the surface water and to identify natural and anthropogenic sources in the coastal environment using distribution of elemental concentrations to establish regional baseline levels. Totally, 25 samples were collected from offshore Pondicherry and Veerampattnam upto 12 mts depth.Metal enrichments observed close to the major urban areas in the Pondicherry coast are associated with the industrialized activities areas rich in Zn and Pb in the coastal sediments.The higher concentration is observed in the Pondicherry region than the Veerampatnam.

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