Tag: morphometric analysis

Recent Articles-IJGGS

Morphometric analysis of Nanjangud taluk, Mysore District, Karnataka, India, using GIS Techniques

Author(s)– Mahadevaswamy.G et.al.,

ABSTRACT
An attempt has been made to study drainage morphometry and its influence on hydrology of Nanjanagud taluk.For detailed study data for preparing DEM, aspect grid and slope maps. Geographic information system was used in evaluation of linear, areal and relief aspects of morphometric parameters. The study reveals that the elongated shape of area is mainly due to guiding effect of thrusting and faulting. In all forty one sub- basin in Nanjangud taluk have been selected for the study. Quantitative morphometric analysis has been carried out for linear, relief, and aerial aspects for all the sub-basin. The streams up to fourth order can be seen in all the sub-basin.  The morphometric analysis reveals that Hullahalli sub-basin show lower value of drainage density, stream frequency, elongation ratio, relief ratio, infiltration number indicating highly permeable sub-soil materials under dense vegetation cover.  Except Hullahalli sub-basin all the other sub-basin showing fractured, resistant, permeable rocks and drainage network seems to be not affected by tectonic disturbances.

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Recent Articles- IJGGS

Morphometric analysis and prioritization of sub-watersheds using GIS and Remote Sensing techniques: a case study of Odisha, India

Author(s)-Sangita Mishra.S, Nagarajan.R

ABSTRACT
The study area is one of the watersheds of Tel river, covering an area of 1515.45 km2 and lies between 19° 17′ and 20° 00′ N latitude and 82° 30′ and 82° 59′E longitude in Bhawanipatna area of Kalahandi district, Odisha, India. Poor soil cover, sparse vegetation, erratic rainfall and lack of soil moisture characterize the study area for most part of the year. Recurring drought coupled with increase in ground water exploitation results in decline in the ground water level. So the entire study area has been further divided into 12 sub-watersheds named SWS-1 to SWS-12, ranging in geographical area from 30 km2 to 202 km2 and has been taken up for prioritization based on morphometric analysis using GIS and remote sensing techniques. The drainage density of sub-watersheds varies between 1.09 to 3.36 km/km2 and low drainage density values of sub-watershed SWS-11 indicates that it has highly resistant, impermeable sub-soil material with dense vegetative cover and low relief. The elongation ratio varies from 0.6 – 0.8 which indicates high relief and steep ground slope. The high value of circularity ratio for SWS-11 sub-watershed (0.8) indicates the late maturity stage of topography. This anomaly is due to diversity of slope, relief and structural conditions prevailing in this sub-watershed. The compound parameter values are calculated and the sub-watershed with the lowest compound parameter is given the highest priority. The sub-watershed SWS-1 has a minimum compound parameter value of 4 is likely to be subjected to maximum soil erosion and susceptible to natural hazards. Hence it should be provided with immediate soil conservation measures.

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Recent Articles-IJES-Morphometric Analysis – A Tool to Identify the Different Variants in a Fish Species E.Maculatus

ABSTRACT

Etroplus maculatus, a fresh water cichlid fish popularly known as orange chromid, commonly found in rivers, streams and canals of India. E.maculatus was collected from Kollidam a branch of Cauvery river of Trichy (Dt), Tamil Nadu. Depending upon the number of black spots, their arrangements and other characters, ten different variants had been identified. Morphometric analysis were made for all ten variants and compared. Among the 15 parameters noted, body weight and body length showed high level of significant positive relationship with total length when compared to all other parameters. This analysis will help to understand the morphometric of different variants which is the most easily perceivable means of assessing the evolutionary adaptation of a species to its environment. Close monitoring is needed to determine its effects on the local environment. The different level of significance between body features of various variants reveals the possibility of segregation of variants of this species.

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