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Assessment of Coastal Water Quality Through Weighted Arithmetic Water Quality Index Around Visakhapatnam, Bay of Bengal, India

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Assessment of Coastal Water Quality Through Weighted Arithmetic Water Quality Index Around Visakhapatnam, Bay of Bengal, India ISSN(Online): 2319-8753 ISSN (Print): 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 12, December 2015 Assessment of Coastal Water Quality through Weighted Arithmetic Water Quality Index around Visakhapatnam, Bay of Bengal, India Vishnupriya Sowjanya, I. 1, B. V. Pavan 2 , P. S. Raja Sekhar 3 Research Scholar, Department of Environmental Sciences, Andhra University, Visakhapatnam, A.P., India1 M.Tech Student, Centre for Water Resources, I.S.T, JNTUH, Hyderabad, India2 Professor, Department of Environmental Sciences, Andhra University, Visakhapatnam, A.P., India3 ABSTRACT: Water quality is of influential and significant importance because of its role to human health, aquatic life, ecological integrity and sustainable economic growth. Thus, continuous assessment and monitoring of water bodies is important. This study is aimed at monitoring the water quality of coastal waters of Visakhapatnam coast. 'Weighted Arithmetic Water Quality Index' (WQI) is a numeric expression used to evaluate the quality of a given water body and to be easily understood by managers and public. High values of WQI were observed in sampling stations of S1 and S4 indicating poor quality of water, whereas, low values of WQI were recorded in all other field stations indicating suitability of those areas for human activities like recreation. Thus, 'Weighted Arithmetic Water Quality Index' proved to be a good measure for categorizing quality of coastal waters of Visakhapatnam. KEYWORDS: 'Weighted Arithmetic Water Quality Index' (WQI), Seasonal variations, Coastal waters, Visakhapatnam. I. INTRODUCTION The coastal environment, as a complex system is mainly influenced by various physical, chemical biological processes. Water quality impacts both directly and indirectly on the diversity and abundance of marine communities as well as recreational use of the coast. Thus, monitoring programs of aquatic systems play a significant role in water quality management. However, the water quality is difficult to be evaluated from a large number of samples, each containing varying concentrations of various water quality variables. The Water Quality Indices (WQI) is among the most effective ways to communicate the information on water quality trends for the water quality management. The present investigation was carried out to calculate the Water Quality Index (WQI) in order to assess the quality of Coastal waters of Visakhapatnam. In [1], the author gave a detailed account of water quality and some aspects of pollution in Visakhapatnam habour, consequent to the rapid industrialisation and urbanisation of the city. Assimilative and healing capacities of coastal waters were studied by [2]. However, their studies have not enumerated the water quality indices on this coast with seasonal variations. The present study focuses on comparison of water quality at different coastal areas along Visakhapatnam coast through “Weighted Arithmetic Water Quality Index”. Copyright to IJIRSET DOI:10.15680/IJIRSET.2015.0412016 11775 ISSN(Online): 2319-8753 ISSN (Print): 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 12, December 2015 II. MATERIALS AND METHODS Study Area The study area of Visakhapatnam Coast of Bay of Bengal, is located in North Eastern part of Andhra Pradesh between 17o15' and 18o 32' Northern latitude and 82o 54' and 83o 30' in Eastern longitude. Figure 1: Map showing the field stations in the present study area of Visakhapatnam Visakhapatnam coastline from Bangarammapalem in the south to Bheemunipatnam in the north comprises of shallow water bays formed due to the protruding hills of 'Eastern Ghats complex‟ into the sea. The Bangarammapalem – Bheemunipatnam coast is associated with several drainage channels that carry nutrients and sediments to the coast, the Sarada River at Bangarammapalem and Gosthani River at Bheemunipatnam, being the major sources as such. For the present study, ten sampling stations were selected along with their geographical positions given in (table 1) below. Table 1: Sampling stations and their Geographical locations. S.No Sampling Station Geographical Position 1 Bangarammapalem 17°24'56"N and 82°52'04"E 2 Rambili 17°27'28"N and 82°57'09"E 3 Pudimadaka 17°28'29"N and 82°59'38"E 4 Appikonda 17°34'09"N and 83°10'14"E 5 Yarada 17°39'47"N and 83°17'01"E Copyright to IJIRSET DOI:10.15680/IJIRSET.2015.0412016 11776 ISSN(Online): 2319-8753 ISSN (Print): 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 12, December 2015 6 Ramakrishna Beach 17°42'40"N and 83°19'09"E 7 Tenneti Park 17°44'53"N and 83°21'01"E 8 Rushikonda Beach 17°47'25"N and 83°23'22"E 9 Thotlakonda 17°49'43"N and 83°24'59"E 10 Bheemunipatnam 17°53'26"N and 83°27'24"E Water Sampling and Analysis: The water samples were collected in pre-cleaned plastic polyethylene bottles for physico-chemical analysis throughout the year in four seasons from April, 2013 to March, 2015. The coastal water samples were analyzed for temperature pH, conductivity, turbidity salinity, dissolved oxygen, biological oxygen demand, ammonical nitrogen, nitrites, nitrates, phosphate-phosphorus, silicates and trace metals (iron, copper, chromium, zinc, cadmium and lead) following standard procedures recommended by the [3]. Traditional approaches to assess water quality are based on a comparison of experimentally determined parameter values with existing guidelines. Table 2: Standards and permissible limits for Coastal Waters S.No Parameter Prescribed Standards 1 Temperature 26-300C** 2 pH 6.5 – 8.5 * 3 Electrical Conductivity 4 Turbidity 30 NTU* 5 Salinity - 6 Total Suspended Solids - 7 Dissolved Oxygen 4.0 mg/l or 50% saturation value whichever is higher* 8 Biochemical Oxygen Demand 3 mg/lit * 9 Ammonia Nitrogen 0.021 mg/l ** 10 Nitrite Nitrogen - 11 Nitrate Nitrogen 0.01-0.06 mg/l as Nitrate** 12 Phosphate-Phosphorus 0.001 – 0.01 mg/lit as Phosphate** 13 Silicate 2.8 mg/l(avg)** 14 Iron (Fe) 3mg/l** 15 Copper (Cu) 0.5mg/l** 16 Chromium (Cr) 0.05mg/l** 17 Zinc (Zn) 0.5mg/l** 18 Cadmium (Cd) 0.005 mg/l** 19 Lead (Pb) 0.05mg/l** * Water Quality Standards for Coastal Waters Marine Outfalls. SW-II Standard. Central Pollution Control Board, New Delhi. Source : EPA, 1986 [GSR 7], dated Dec. 22, 1998. ** South African Water Quality Guidelines for Coastal Marine Waters, 1996. International Target Values for the Natural Marine Environment, Vol.1, pp B-1-B-3. and Chap. 4.2. pp 31. However, it does not readily give an overall view of the spatial and temporal trends in the water quality [4]. Water Quality Indices are established from important physico-chemical parameters for different months to understand the coastal water quality better for the general public using 'Weighted Arithmetic Water Quality Index'. Copyright to IJIRSET DOI:10.15680/IJIRSET.2015.0412016 11777 ISSN(Online): 2319-8753 ISSN (Print): 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (An ISO 3297: 2007 Certified Organization) Vol. 4, Issue 12, December 2015 WQI = Σ QiWi / Σ Wi Where, Qi = Quality rating Wi = Relative weight Water quality grads can be classified by as excellent, good, poor, very poor and unsuitable with reference to the grads provide in Table 3. [4],[5]. Table 3: Grads of Water Quality Index (WQI) and status of Water Quality Rating. WQI Category of Water Quality <50 Excellent 50-100 Good 100-200 Poor 200-300 Very Poor >300 Unsuitable III. RESULTS AND DISCUSSION Investigations on water quality revealed appreciable differences between the coastal environment subject to pollution and the unaffected open sea location. Statistical descriptions such as mean, standard deviation, maximum and minimum values of analytical results of Physico-chemical parameters at different field station at Visakhapatnam coast are given in Table 4. Table 4: Statistical description of various parameters at different sampling stations of Visakhapatnam coastline. Parameters Statistics S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 Minimum 26.6 26.6 26.2 32.8 26.1 26.4 26.1 26.3 26 26.8 Temperature Maximum 29.7 29.1 29.1 33.6 29 29.6 29.4 29.1 29 29.2 (degrees Mean 27.85 27.8 27.5 33.2 27.6 28.05 27.83 27.8 27.6 27.9 Celsius) Std. Deviation 1.215 1 0.99 0.29 0.98 1.116 1.197 0.96 1.08 0.99 Minimum 7.9 7.7 7.6 7.8 7.6 7.9 7.8 7.8 7.6 7.8 Maximum 8.3 8.1 8.1 8.7 8 8.4 8.3 8.2 8 8.2 pH Mean 8.125 8 7.88 8.36 7.75 8.036 7.961 8.08 7.76 7.88 Std. Deviation 0.128 0.14 0.17 0.29 0.15 0.16 0.15 0.13 0.15 0.14 Minimum 41.27 30 25.1 65.3 25.8 30.02 29.98 27.3 25.5 27.7 Conductivity Maximum 44.68 48.9 36.8 79.3 38.9 43.14 44.58 41.4 34.7 42.3 (mS/cm) Mean 42.94 33.6 28.2 68.2 28 33.18 32.72 30.5 27.4 30.2 Std. Deviation 1.016 6.25 3.62 4.61 4.42 4.204 4.904 4.5 2.98 4.93 Minimum 34.06 27.3 20 36.2 21 28.01 27.57 26.4 24.3 28 Turbidity Maximum 45.6 40.4 34.2 47.5 37.8 42.5 41.57 39.7 38.6 40.9 (NTU) Mean 36.41 30.5 23.3 39.1 25.2 32.86 32.2 30.7 27.8 32 Std.
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