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Ashtamudi Lake - an Overview on Physical Characteristics Vol 11, Issue 6,June/ 2020 ISSN NO: 0377-9254 ASHTAMUDI LAKE - AN OVERVIEW ON PHYSICAL CHARACTERISTICS Saranya U* and Prof. (Dr.) Lancelet T.S** *Research Scholar, Dept. of Geography, SSUS, Kalady **Professor, Dept. of Geography, SSUS, Kalady e-mail - [email protected], [email protected] Abstract Water is one of the most important resources available on this earth that has an influence on Water is one of the most important resources human activities. All important aspects such as available on this earth that has an influence on agriculture, industry, day to day life is dependent human activities. The physical characteristics of on water. It is the most important factor for a place make up its natural environment and are survival of life on this earth. The physical derived from geological, hydrological, characteristics of a place make up its natural atmospheric, and biological processes. Surface environment and are derived from geological, and ground water are the important source of hydrological, atmospheric, and biological water on the earth where contemporary needs processes. They include land forms, bodies of focus on surface water and it leads to global water, climate, soils, natural vegetation and deterioration. Ashtamudi Lake is a unique water animal life (The Five Themes of Geography, system with limnological and hydrological AAG, 1984). Surface and ground water are the characteristics. Ashtamudi Lake derives its name important source of water on the earth where from its shape, having eight prominent arms or contemporary needs focus on surface water and channels branching out, like that of a palm tree it leads to global deterioration. Limnology is a or an octopus. ‘Ashtamudi' means eight-coned broader discipline between Geography, (‘Ashta’ means eight; ‘mudi’ means coned) in Hydrology and Biology, and is closely connected the local Malayalam language. This extensive with other sciences, from it borrows research estuarine system, the second largest and deepest methods (Gastescu Petre, 2009). A lake is a large in Kerala, is connected to sea at Neendakara in body of natural water collected in a depression. It the western part and feed by Kallada River in the differs from a pond/ tank due to its larger size, east. The main objective of this study is to find presence of biotic life and many other ecological out and analyse the physical characteristics of the factors. (Balasubramanian, A, 2015). Ashtamudi Ashtamudi Lake including location, topography, Lake is a unique water system with limnological geology, climate, hydrology, shape and structure and hydrological characteristics. This paper helps and bio diversity. For analysing the objective the to identify the physical characteristics of the investigator uses both primary and secondary lake. data with technological supports. The obtained information is analysed and made appropriate Study area charts and maps. This paper helps to conclude that the characteristics features are unique and Ashtamudi Lake, Ramsar site No. 1204, in important for future research in this area. Kollam district of South Kerala is located between 8°50'N to 905’N and 76°30'E to Key words: Ashtamudi Lake, Physical 76040’E. It is the second largest lake after Settings, Shape and Structure, Bio diversity Vembanad. It has a length of 16 km with 14 km width and having maximum depth of 6.4m Introduction spreads over an area of 51.2 sq. km. Ashtamudi means ‘eight braids’ (Ashta means eight in www.jespublication.com Page No:398 Vol 11, Issue 6,June/ 2020 ISSN NO: 0377-9254 Sanskrit and mudi means hair braids, i.e., its is connected to sea at Neendakara in the western branches). As the name indicates it has eight part and feed by Kallada River in the east. The branches and it is a palm shaped vast water body following map (Map 1) shows the location of looks like an octopus. This extensive estuarine Ashtamudi Lake. system, the second largest and deepest in Kerala, Map 1: location map of Ashtamudi Lake 1. Physical setting – location, topography, climate, geology, hydrology Objectives 2. Shape and structure 3. Biodiversity The main objective of this study is to find out and analyse the physical characteristics of the 1. Physical setting Ashtamudi Lake. Physical setting of the Ashtamudi Lake Methods and Techniques includes location, topography, climate, geology Methods used for conducting this study are and hydrology. primary and secondary. Primary sources of 1.1 information are obtained through toposheet, Location interview (casual talks and formal questions), surveys and secondary sources used are the Ashtamudi Lake is located between 8°50'N reports by governmental and non-governmental to 905’N and 76°30'E to 76040’E in the Kollam organisations respectively. The obtained District of Kerala, South India. The lake covers information is analysed and made appropriate an area of 51.2 km2. The bank of the water body charts, diagrams and maps through Micro Soft is filled with backwater canals, clusters of Excel, ARC GIS 10.2.1 respectively. coconut trees and palms which are sprinkled with towns and villages. The lake has an outlet at Result and Discussion Neendakara, where it joins with the Arabian Sea Ashtamudi Lake is also an estuary which has and there forms an Estuary. That portion so many ecological and hydrological (seaward portion) is in the lowland, while importances. Here discuss its peculiarities. landward side towards east and south, the hinterland falls in the midland. The lake itself is The physical characteristics of the surrounded by 13 panchayat and 1 corporation. Ashtamudi Lake are given below: www.jespublication.com Page No:399 Vol 11, Issue 6,June/ 2020 ISSN NO: 0377-9254 The following map (Map 2) shows the Lake with its surrounding area. Map 2: Ashtamudi Lake and its bordering area 1.2 Topography Topography is a broad term used to describe 1.3 Climate the detailed study of the earth's surface. This includes changes in the surface such as Kollam has a tropical climate. There is mountains and valleys as well as features such substantial rainfall in most months of the year. as rivers and roads (Higgins, Charlie, 2017). The short dry season has slight effect on the Ashtamudi Lake, as the name indicates lake’s overall climate. The Köppen-Geiger climate topography with its multiple branches. The classification is Am. It experiences hot and main peculiarity of the lake is that its humid summers and sufficiently of seasonal relationship between land water. It’s the only rainfall. Temperatures recorded in the area are a lake having an inlet and outlet. Inlet is the maximum of 27.5 °C (81.5 °F) and a minimum Kallada River and it debouches in to the lake at of 25.5 °C (77.9 °F), due to the presence of Peringalam and outlet is at Neendakara, where Arabian Sea difference between summer and it joins with the sea. The river is originated winter temperatures are moderate. The area from the Western Ghats region with an receives an average annual rainfall of 2400 mm elevation of 1524 m above MSL. After covering (94 in) and the humidity during the rainy days is a distance of 120 km it joins with the 90%. The climate is hot and humid during April– Ashtamudi Lake. The surface elevation of the May while cool during December–January and lake is 10 m above MSL. The lake is also called rainy in June-November. the gateway to the backwaters of Kerala. 1.4 Geology Bathymetric contour of the lake varies from 2 m to 6m. Both sides of the Kallada river have vast Ashtamudi Lake is confined to the Warkallis flood plains with about 4 km wide. The formation with eastward extension, have their Ashtamudi Lake is characterised by the long-axis perpendicular to the shoreline and the presence of big as well as small islands, they sides are fringed with escarpments of bed rock or are inhabited and uninhabited by human beings. laterite developed over the Tertiary formations The most famous islands are Munroe Island, respectively. These are identified with the Chavara and Thekkumbhagam. eroding coast line stretches that experience high www.jespublication.com Page No:400 Vol 11, Issue 6,June/ 2020 ISSN NO: 0377-9254 wave energy. Steep slopes of lateritic cappings Map 3 shows the stages of development of and escarpments of 10-15 m high, developed the Ashtamudi estuarine basins during Pre- over rocks of the Warkalli formations are visible. Holocene and Middle- Holocene along with It is situated in the SKSB uplifted block and this present day scenarios. At this time, the shoreline estuary shows antecedent characteristics. This might have shifted 3-4 kilometres (map 3.1) estuary is the deepest among all the estuaries of eastwards with respect to the present coast, a Kerala with a maximum depth of 6.4 m at the feature also reported earlier by Nair (1996). confluence zone. The present Ashtamudi estuary, Thereafter, the coastline prograded seaward and, is wave dominated and bar built one, represents dunes and marshes have developed in the only a portion of the mega basin existed during regressive phase which in turn is marked by Pre-Holocene which was later filled up in its substantially reduced rainfall as compared to upper half by sediments brought by the Kallada Early Holocene. River during Early Holocene Climatic Optimum (9-6 BP); (Padmalal et al., 2011; Padmalal et al., 2013). Map 3 Map 3.1 1.5 Hydrology Shendurni and the Kalthuruthy forms the Kallada River. A dam was constructed in the river at Hydrology defines Ashtamudi, the deepest Parappar, a reservoir is formed by constructing a estuary in Kerala, receives discharge of Kallada gravity type masonry dam. The gross storage 2 River (length = 120 km; Basin Area = 1700 km capacity of the reservoir is 504.92 Mm3.
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