Factors affecting the environmental carrying capacity of a freshwater tropical lake system
| Autor: | A. Shahul Hameed, Sabu Joseph, Sheela A. Moses, C. Unnikrishnan Warrier, Vishnuprasad Mullakkezhil Reghunathan |
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| Rok vydání: | 2016 |
| Předmět: |
Pollution
Conservation of Natural Resources media_common.quotation_subject 0208 environmental biotechnology Alkalinity Drainage basin India 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law Monsoon 01 natural sciences Water Quality Carrying capacity 0105 earth and related environmental sciences General Environmental Science media_common Hydrology geography geography.geographical_feature_category General Medicine 020801 environmental engineering Lakes Environmental science Water quality Surface runoff Eutrophication Environmental Monitoring |
| Zdroj: | Environmental Monitoring and Assessment. 188 |
| ISSN: | 1573-2959 0167-6369 |
| Popis: | Environmental carrying capacity is a measure of competence of a lake to accommodate pollution inputs without degrading water quality. In the research reported here, we identified the factors influencing the environmental carrying capacity of Vellayani Lake or VL (a typical tropical freshwater lake), Thiruvananthapuram, Kerala State, India. R-mode factor analysis is used to identify the factors controlling the carrying capacity of the lake, whereas hierarchical cluster analysis (HCA) helped to classify the lake. The carrying capacity of the lake is low with respect to alkalinity, due to ion deficiency, and is potentially reactive to sudden changes in pH. Eutrophic condition exists in the entire lake system. Acidic factor, mineralization factor, fertilizer factor (P & K), evaporation factor and organic pollution factor are the controllers of VL water quality during the pre-monsoon period. The same factors (but not evaporation factor) and an additional runoff factor control the water quality during monsoon. In the post-monsoon, the aforesaid factors (other than runoff, alkalinity) and soil erosion factor influence the water quality. Hence, managers of the lake system need to also focus on combating acidic factor during pre- and post-monsoons and runoff during monsoon. Smaller areal extent and shallow depth of VL, reduced outflow from it, less rainfall, presence of lateritic rock and soil and absence of limestone strata in the catchment are the chief elements affecting the acidic factor of Vellayani Lake. |
| Databáze: | OpenAIRE |
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