DOCSLIB.ORG

Brahmani-Baitarani, Odisha Final

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Brahmani-Baitarani, Odisha Final Government of India DFID Ministry of Water Resources, River Development and Ganga Rejuvenation Asian National Water Mission Development Bank Central Water Commission Policy and Advisory Technical Assistance 8089 IND Phase II Operational Research to Support Mainstreaming of Integrated Flood Management under Climate Change Volume 5b Modelling Report Brahmani-Baitarani, Odisha Final December 2015 Deltares in association with RMSI and JPS Operational Research to Support Mainstreaming Integrated Flood Management in India under Climate Change Vol. 5b Modelling Report Brahmani-Baitarani – Final December 2015 Cover: SOBEK Schematisation Brahmani-Baitarani River ii Operational Research to Support Mainstreaming Integrated Flood Management in India under Climate Change Vol. 5b Modelling Report Brahmani-Baitarani – Final December 2015 CONTENTS Abbreviations .................................................................................................................................. vii Units ............................................................................................................................................... viii Chapter 1 Introduction ................................................................................................................. 1 1.1 Flood Risk Modelling and Mapping .................................................................................. 1 1.2 The role of the consortium............................................................................................... 1 1.3 The purpose of probabilistic analysis ............................................................................... 2 1.4 Outline .............................................................................................................................. 2 Chapter 2 Basin description: Brahmani-Baitarani ........................................................................ 3 2.1 Brahmani river basin ........................................................................................................ 3 2.2 Baitarani River Basin ........................................................................................................ 6 2.3 Rainfall distribution .......................................................................................................... 6 2.4 Flooding ............................................................................................................................ 6 2.5 Recent floods.................................................................................................................... 8 2.6 Current flood mitigation................................................................................................... 9 2.6.1 Embankments .......................................................................................................... 9 2.6.2 Storage dams ......................................................................................................... 10 Chapter 3 Topographical data .................................................................................................... 14 3.1 General ........................................................................................................................... 14 3.1.1 River Network ........................................................................................................ 14 3.1.2 Digital Elevation Model .......................................................................................... 14 3.1.3 Bhuvan Cartosat 30m DEM .................................................................................... 15 3.1.4 SRTM DEM ............................................................................................................. 16 3.2 Geography ...................................................................................................................... 16 3.3 Land use ......................................................................................................................... 17 3.4 Inventory of cross sections............................................................................................. 19 3.5 Inventory of modelled structures .................................................................................. 20 3.6 Inventory of civil line elements ...................................................................................... 20 3.6.1 Embankments ........................................................................................................ 20 3.6.2 Roads ..................................................................................................................... 21 Chapter 4 Hydrological models and Rengali reservoir model .................................................... 22 4.1 General ........................................................................................................................... 22 iii Operational Research to Support Mainstreaming Integrated Flood Management in India under Climate Change Vol. 5b Modelling Report Brahmani-Baitarani – Final December 2015 4.2 The Nedbor Afstromnings Model (NAM) concept ......................................................... 22 4.3 Drainage area definition................................................................................................. 22 4.3.1 Catchment delineation .......................................................................................... 22 4.3.2 Sub-catchment delineation.................................................................................... 23 4.3.3 Muskingum routing ................................................................................................ 24 4.4 Calibration approach ...................................................................................................... 26 4.4.1 General................................................................................................................... 26 4.4.2 Selection of calibration periods ............................................................................. 27 4.4.3 Meteorological forcing........................................................................................... 27 4.4.4 Goodness of Fit criteria .......................................................................................... 28 4.5 Calibration ...................................................................................................................... 29 4.5.1 Model input ........................................................................................................... 29 4.5.2 Calibration results of Rengali inflow ...................................................................... 30 4.5.3 Evaluation of GoF criteria ...................................................................................... 31 4.6 Validation ....................................................................................................................... 32 4.6.1 Model input ........................................................................................................... 32 4.6.2 Validation results of Rengali inflow ....................................................................... 32 4.6.3 Evaluation of GoF criteria ...................................................................................... 33 4.7 Conclusions on calibration and validation ..................................................................... 33 Chapter 5 1D/2D Hydrodynamic model ..................................................................................... 35 5.1 Introduction ................................................................................................................... 35 5.1.1 Integrated 1D/2D modelling .................................................................................. 35 5.1.2 Rationale for model selection ................................................................................ 35 5.2 Setup of the 1D/2D hydrodynamic model ..................................................................... 37 5.2.1 The schematised river system ............................................................................... 37 5.2.2 Cross-sections ........................................................................................................ 38 5.2.3 Structures............................................................................................................... 39 5.2.4 Overland flow......................................................................................................... 39 5.2.4.1 Digital Elevation Model (DEM) preparation ...................................................... 39 5.2.4.2 Line elements..................................................................................................... 40 5.2.4.3 Friction ............................................................................................................... 41 5.2.5 Boundary conditions .............................................................................................. 43 5.2.6 Sea boundaries ...................................................................................................... 43 iv Operational Research to Support Mainstreaming Integrated Flood Management in India under Climate Change Vol. 5b Modelling Report Brahmani-Baitarani – Final December 2015 5.2.7 Initial conditions .................................................................................................... 45 5.2.8 Salt intrusion .........................................................................................................
Load more

Recommended publications
  • Mahanadi Delta
    Study Area - Mahanadi Delta Mahanadi delta is formed by a network of three major rivers: Mahanadi, Brahmhani and Baitarini draining into the Bay of Bengal. The coastline of the delta is about 200 km long which stretches from south near Chilika to north up to Dhamra River. Using SRTM 30m digital surface elevation data, area within 5m contour from the coast line has been extracted within the vicinity of Mahanadi delta (Figure 1). Figure 1 SRTM 5m filled contour (shown as light blue) overlaid on LULC map of Mahandi Delta The 5m contour spread across districts of Khordha, Puri, Jagatsinghpur, Kendrapara, Jajpur and Bhadrak. Chilika lake is also within 5m contour line and within the Mahanadi delta. The district Baleswar, in the extreme north is within 5m contour, but it is outside the Mahanadi delta. The geomorphological map (Figure 2) of the region (Source: Bhuvan-NRSC) also indicates that these features lie in coastal region of Mahanadi and adjacent river systems. Using the above criteria, five districts, namely, Khordha, Puri, Jagatsinghpur, Kendrapara and Bhadrak have been considered as the study area for Mahanadi Delta (Figure 3). The north and south bounds of the study areas have been defined using the geomorphological map, and Jajpur has been excluded, as it is not lying in the Mahanadi river system, though part of coastal zone. The total study area is 13137.679sq km and consisting of 5 administrative districts and 45 Blocks (sub-district) as shown in Figures 3 and 4 respectively. In Table 1 the physical area of the blocks/districts has been provided.
    [Show full text]
  • (IJTSRD) Hydrogeochemical Analysis and Quality Evaluatio
    International Journal of Trend in Scientific Research and Development (IJTSRD) International Open Access Journal ISSN No: 2456 - 6470 | www.ijtsrd.com | Volume - 1 | Issue – 6 Hydrogeochemical Analysis and Quality Evaluation of Groundwater for Irrigation Purposes in Puri District, Odisha Swarna Manjari Behera Dr. Falguni Baliarsingh Student, Civil Engineering Department, Associate Professor, Civil Engineering College Of Engineering and Technology Department, College Of Engineering and Bhubaneswar, Odisha, India Technology Bhubaneswar, Odisha, India ABSTRACT The present study is carried out in the Puri district, feldspars), as well as Fluorides, hydroxides, Odisha, India to ascertain the suitability of chlorides, carbonates and silicates and many others,. groundwater for irrigation purposes. The parameters Apart from natural processes, other controlling used to ascertain the suitability of groundwater for factors on the GW quality include heavy metals, irrigation purposes are synthesized. The physico pollution and contamination resulting from some chemical observations used for the purpose were ; uncontrolled effluent discharges from industries, pH, electrical conductivity, total dissolved solids, liquid wastes of urbans, harmful agricultural calcium, magnesium, potassium, carbonate, practices (e.g., excessive application of pesticides bicarbonate and the irrigation indexing parameters and fertilizers). The quality required of a calculated were, sodium adsorption ratio, residual groundwater supply depends on its purpose of use sodium carbonate,
    [Show full text]
  • Multi- Hazard District Disaster Management Plan
    MULTI –HAZARD DISTRICT DISASTER MANAGEMENT PLAN, BIRBHUM 2018-2019 MULTI – HAZARD DISTRICT DISASTER MANAGEMENT PLAN BIRBHUM - DISTRICT 2018 – 2019 Prepared By District Disaster Management Section Birbhum 1 MULTI –HAZARD DISTRICT DISASTER MANAGEMENT PLAN, BIRBHUM 2018-2019 2 MULTI –HAZARD DISTRICT DISASTER MANAGEMENT PLAN, BIRBHUM 2018-2019 INDEX INFORMATION 1 District Profile (As per Census data) 8 2 District Overview 9 3 Some Urgent/Importat Contact No. of the District 13 4 Important Name and Telephone Numbers of Disaster 14 Management Deptt. 5 List of Hon'ble M.L.A.s under District District 15 6 BDO's Important Contact No. 16 7 Contact Number of D.D.M.O./S.D.M.O./B.D.M.O. 17 8 Staff of District Magistrate & Collector (DMD Sec.) 18 9 List of the Helipads in District Birbhum 18 10 Air Dropping Sites of Birbhum District 18 11 Irrigation & Waterways Department 21 12 Food & Supply Department 29 13 Health & Family Welfare Department 34 14 Animal Resources Development Deptt. 42 15 P.H.E. Deptt. Birbhum Division 44 16 Electricity Department, Suri, Birbhum 46 17 Fire & Emergency Services, Suri, Birbhum 48 18 Police Department, Suri, Birbhum 49 19 Civil Defence Department, Birbhum 51 20 Divers requirement, Barrckpur (Asansol) 52 21 National Disaster Response Force, Haringahata, Nadia 52 22 Army Requirement, Barrackpur, 52 23 Department of Agriculture 53 24 Horticulture 55 25 Sericulture 56 26 Fisheries 57 27 P.W. Directorate (Roads) 1 59 28 P.W. Directorate (Roads) 2 61 3 MULTI –HAZARD DISTRICT DISASTER MANAGEMENT PLAN, BIRBHUM 2018-2019 29 Labpur
    [Show full text]
  • Eastern India Pramila Nandi
    P: ISSN NO.: 2321-290X RNI : UPBIL/2013/55327 VOL-5* ISSUE-6* February- 2018 E: ISSN NO.: 2349-980X Shrinkhla Ek Shodhparak Vaicharik Patrika Dimension of Water Released for Irrigation from Mayurakshi Irrigation Project (1985-2013), Eastern India Abstract Independent India has experienced emergence of many irrigation projects to control the river water with regulatory measures i.e. dam, barrage, embankment, canal etc. These irrigation projects were regarded as tools of development and it was thought that they will take the economy of the respective region to a higher level. Against this backdrop, the Mayurakshi Irrigation Project was initiated in 1948 with Mayurakshi as principal river and its four main tributaries namely Brahmani, Dwarka, Bakreswar and Kopai. This project aimed to supply water for irrigation to the agricultural field of the command area at the time of requirement and assured irrigation was the main agenda of this project’s commencement. In this paper the author has tried to find out the current status of the timely irrigation water supply which was the main purpose of initiation of this project. Keywords: Irrigation Projects, Regulatory Measures, Command Area, Assured Irrigation. Introduction In the post-independence period, India has shown accelerating trend in growth of irrigation projects. Following USA and other advanced economies of the time, independent India encouraged irrigation projects to ensure assured irrigation, flood control, generation of hydroelectricity. Then Prime Minister Jawhar Lal Neheru entitled the dams as temples of modern India. Mayurakshi Irrigation Project (MIP) was one of them and was Pramila Nandi launched in 1948 to serve water to the thirsty agricultural lands of one of Research Scholar, the driest district of West Bengal i.e.
    [Show full text]
  • Central Water Commission Daily Flood Situation Report Cum Advisories 26-08-2020
    Central Water Commission Daily Flood Situation Report cum Advisories 26-08-2020 1.0 IMD information 1.1 1.1 Basin wise departure from normal of cumulative and daily rainfall Large Excess Excess Normal Deficient Large Deficient No Data No [60% or more] [20% to 59%] [-19% to 19%) [-59% to -20%] [-99% to -60%] [-100%) Rain Notes: a) Small figures indicate actual rainfall (mm), while bold figures indicate Normal rainfall (mm) b) Percentage departures of rainfall are shown in brackets. th 1.2 Rainfall forecast for next 5 days issued on 26 August 2020 (Midday) by IMD 2.0 CWC inferences 2.1 Flood Situation on 26th August 2020 2.1.1 Summary of Flood Situation as per CWC Flood Forecasting Network On 26th August 2020, 23 Stations (14 in Bihar, 3 in Uttar Pradesh, 3 in Odisha and 1 each in Assam, Jharkhand & West Bengal) are flowing in Severe Flood Situation and 18 stations (8 in Bihar, 5 each in Assam and 5 in Uttar Pradesh) are flowing in Above Normal Flood Situation. Inflow Forecast has been issued for 34 Barrages & Dams (11 in Karnataka, 6 in Andhra Pradesh, 4 in Jharkhand, 3 in Uttar Pradesh, 2 each in Madhya Pradesh, Tamilnadu, Telangana & West Bengal, 1 each in Gujarat & Odisha). Details can be seen in link - http://cwc.gov.in/sites/default/files/cfcr-cwcdfb26082020_5.pdf 2.1.2 Flood Situation Map 2.2 CWC Advisories Widespread rainfall with isolated heavy to very heavy falls very likely over Odisha, Gangetic West Bengal & Jharkhand today, the 26th, over Chhattisgarh, Vidarbha, East Madhya Pradesh during 26th - 28th; over West Madhya Pradesh on 28th & 29th and over East Rajasthan on 29th & 30th August, 2020.
    [Show full text]
  • Inner Front.Pmd
    BUREAU’S HIGHER SECONDARY (+2) GEOLOGY (PART-II) (Approved by The Council of Higher Secondary Education, Odisha, Bhubaneswar) BOARD OF WRITERS (SECOND EDITION) Dr. Ghanashyam Lenka Dr. Shreerup Goswami Prof. of Geology (Retd.) Professor of Geology Khallikote Autonomous College, Berhampur Sambalpur University, Jyoti Vihar, Burla Dr. Hrushikesh Sahoo Dr. Sudhir Kumar Dash Emeritus Professor of Geology Reader in Geology Utkal University, Vani Vihar, Bhubaneswar Sundargarh Autonomous College, Sundargarh Dr. Rabindra Nath Hota Dr. Nabakishore Sahoo Professor of Geology Reader in Geology Utkal University, Vani Vihar, Bhubaneswar Khallikote Autonomous College, Berhampur Dr. Manoj Kumar Pattanaik Lecturer in Geology Khallikote Autonomous College, Berhampur BOARD OF WRITERS (FIRST EDITION) Dr. Satyananda Acharya Mr. Premananda Ray Prof. of Geology (Retd.) Reader in Geology (Retd.) Utkal University, Vani Vihar, Bhubaneswar Utkal University, Vani Vihar, Bhubaneswar Mr. Anil Kumar Paul Dr. Hrushikesh Sahoo Reader in Geology (Retd.) Professor of Geology Utkal University, Vani Vihar, Bhubaneswar Utkal University, Vani Vihar, Bhubaneswar Dr. Rabindra Nath Hota Reader in Geology, Utkal University, Vani Vihar, Bhubaneswar REVIEWER Dr. Satyananda Acharya Professor of Geology (Retd) Former Vice Chancellor of Utkal University, Vani Vihar, Bhubaneswar Published by THE ODISHA STATE BUREAU OF TEXTBOOK PREPARATION AND PRODUCTION Pustak Bhawan, Bhubaneswar Published by: The Odisha State Bureau of Textbook Preparation and Production, Pustak Bhavan, Bhubaneswar, Odisha, India First Edition - 2011 / 1000 Copies Second Edition - 2017 / 2000 Copies Publication No. - 194 ISBN - 978-81-8005-382-5 @ All rights reserved by the Odisha State Bureau of Textbook Preparation and Production, Pustak Bhavan, Bhubaneswar, Odisha. No part of this publication may be reproduced in any form or by any means without the written permission from the Publisher.
    [Show full text]
  • The National Waterways Bill, 2016
    Bill No. 122-F of 2015 THE NATIONAL WATERWAYS BILL, 2016 (AS PASSED BY THE HOUSES OF PARLIAMENT— LOK SABHA ON 21 DECEMBER, 2015 RAJYA SABHA ON 9 MARCH, 2016) AMENDMENTS MADE BY RAJYA SABHA AGREED TO BY LOK SABHA ON 15 MARCH, 2016 ASSENTED TO ON 21 MARCH, 2016 ACT NO. 17 OF 2016 1 Bill No. 122-F of 2015 THE NATIONAL WATERWAYS BILL, 2016 (AS PASSED BY THE HOUSES OF PARLIAMENT) A BILL to make provisions for existing national waterways and to provide for the declaration of certain inland waterways to be national waterways and also to provide for the regulation and development of the said waterways for the purposes of shipping and navigation and for matters connected therewith or incidental thereto. BE it enacted by Parliament in the Sixty-seventh Year of the Republic of India as follows:— 1. (1) This Act may be called the National Waterways Act, 2016. Short title and commence- (2) It shall come into force on such date as the Central Government may, by notification ment. in the Official Gazette, appoint. 2 Existing 2. (1) The existing national waterways specified at serial numbers 1 to 5 in the Schedule national along with their limits given in column (3) thereof, which have been declared as such under waterways and declara- the Acts referred to in sub-section (1) of section 5, shall, subject to the modifications made under this tion of certain Act, continue to be national waterways for the purposes of shipping and navigation under this Act. inland waterways as (2) The regulation and development of the waterways referred to in sub-section (1) national which have been under the control of the Central Government shall continue, as if the said waterways.
    [Show full text]
  • NW-22 Birupa Badi Genguti Brahmani Final
    Final Feasibility Report of Cluster 4 – Birupa / Badi Genguti / Brahmani River Feedback Infra (P) Limited i Final Feasibility Report of Cluster 4 – Birupa / Badi Genguti / Brahmani River Table of Content 1 Executive Summary ......................................................................................................................... 1 2 Introduction ..................................................................................................................................... 7 2.1 Inland Waterways in India ...................................................................................................... 7 2.2 Project overview ..................................................................................................................... 7 2.3 Objective of the study ............................................................................................................. 7 2.4 Scope ....................................................................................................................................... 8 2.4.1 Scope of Work in Stage 1 .................................................................................................... 8 2.4.2 Scope of Work in Stage 2 .................................................................................................... 8 3 Approach & Methodology ............................................................................................................. 11 3.1 Stage-1 .................................................................................................................................
    [Show full text]
  • Talcher-Dhamra Stretch of Rivers, Geonkhali-Charbatia Stretch of East Coast Canal, Charbatia-Dhamra Stretch of Matai River and Mahanadi Delta Rivers) Act, 2008 Act No
    THE NATIONAL WATERWAY (TALCHER-DHAMRA STRETCH OF RIVERS, GEONKHALI-CHARBATIA STRETCH OF EAST COAST CANAL, CHARBATIA-DHAMRA STRETCH OF MATAI RIVER AND MAHANADI DELTA RIVERS) ACT, 2008 ACT NO. 23 OF 2008 [17th November, 2008.] An Act to provide for the declaration of the Talcher-Dhamra stretch of Brahmani-Kharsua- Dhamra rivers, Geonkhali-Charbatia stretch of East Coast Canal, Charbatia-Dhamra stretch of Matai river and Mahanadi delta rivers between Mangalgadi and Paradip in the States of West Bengal and Orissa to be a national waterway and also to provide for the regulation and development of the said stretch of the rivers and the canals for the purposes of shipping and navigation on the said waterway and for matters connected therewith or incidental thereto. BE it enacted by Parliament in the Fifty-ninth Year of the Republic of India as follows:— 1. Short title and commencement.—(1) This Act may be called the National Waterway (Talcher-Dhamra Stretch of Rivers, Geonkhali-Charbatia Stretch of East Coast Canal, Charbatia- Dhamra Stretch of Matai River and Mahanadi Delta Rivers) Act, 2008. (2) It shall come into force on such date1 as the Central Government may, by notification in the Official Gazette, appoint. 2. Declaration of certain stretches of rivers and canals as National Waterway.—The Talcher- Dhamra stretch of Brahmani-Kharsua-Dhamra rivers, Geonkhali-Charbatia stretch of East Coast Canal, Charbatia-Dhamra stretch of Matai river and Mahanadi delta rivers between Mangalgadi and Paradip, the limits of which are specified in the Schedule, is hereby declared to be a National Waterway. 3.
    [Show full text]
  • Research Setting
    S.K. Acharya, G.C. Mishra and Karma P. Kaleon Chapter–6 Research Setting Anshuman Jena, S K Acharya, G.C. Mishra and Lalu Das In any social science research, it is hardly possible to conceptualize and perceive the data and interpret the data more accurately until and unless a clear understanding of the characteristics in the area and attitude or behavior of people is at commend of the interpreter who intends to unveil an understanding of the implications and behavioral complexes of the individuals who live in the area under reference and from a representative part of the larger community. The socio demographic background of the local people in a rural setting has been critically administered in this chapter. A research setting is a surrounding in which inputs and elements of research are contextually imbibed, interactive and mutually contributive to the system performance. Research setting is immensely important in the sense because it is characterizing and influencing the interplays of different factors and components. Thus, a study on Perception of Farmer about the issues of Persuasive certainly demands a local unique with natural set up, demography, crop ecology, institutional set up and other socio cultural Social Ecology, Climate Change and, The Coastal Ecosystem ISBN: 978-93-85822-01-8 149 Anshuman Jena, S K Acharya, G.C. Mishra and Lalu Das milieus. It comprises of two types of research setting viz. Macro research setting and Micro research setting. Macro research setting encompasses the state as a whole, whereas micro research setting starts off from the boundaries of the chosen districts to the block or village periphery.
    [Show full text]
  • Expression of Interest for Water Sports Activities in Selected Water Bodies of the State.Pdf
    Department of Tourism, Govt.of Odisha Paryatan Bhawan, Lewis Road, Bhubaneswar - 14 No. II ~ I TSM, Bhubaneswar, dt ... .d.-,~: ..U.:. t.&. TCT-COOO-MIS -22/2018 Expression of Interest for Water Sports activities in selected water bodies of the State Odisha has a long coast line measuring approximately 482 km ., five major Rivers, water bodies, reservoirs including Chilka, the largest brackish water lake of Asia which has tremendous tourism potential. To unlock the potential, Department of Tourism , Govt.of Odisha is planning to develop water sports activities in 13 major water bodies of the State with private sector intervention. Project proposals are invited from the potential investors for these water bodies for development of water sports activities. Detail EOI can be downloaded from www.odishatourism.gov.in from 20th November 2018 onwards. The last date for submission of proposal is 11 .12.2018 up to 4.00 P.M at the following address. ubki/' Director Tourism & Spl.Secy.to Govt. Department of Tourism, Govt.of Odjsha Paryatan Shawan, Lewis Road, Shubaneswar 751014 Department of Tourism, Govt.of Odisha Paryatan Bhawan, Lewis Road, Bhubaneswar - 14 Expression of Interest for Water Sports activities in selected water bodies of the State. Odisha has a long coast line measuring approximately 482 km., five major Rivers, water bodies, reservoirs including Chilka, the largest brackish water lake of Asia which has tremendous tourism potential. To unlock the potential, Department of Tourism, Govt.of Odisha is planning to develop water sports activities in major water bodies, river, lakes & beaches of the State with private sector intervention. Odisha Tourism Policy, 2016 (http://www.odishatourism.gov.in/sites/defaultlfiles/ Odisha%20Tourism%20Policy%202016.pdf) offers loads of fiscal incentives to projects like water sports, adventure sports, cruise boat, house boat, cruise tourism project, aquarium, aqua-park etc.
    [Show full text]
  • Influence of Water Quality on the Biodiversity of Phytoplankton in Dhamra River Estuary of Odisha Coast, Bay of Bengal
    March JASEM ISSN 1119-8362 Full-text Available Online at J. Appl. Sci. Environ. Manage. , 2011 All rights reserved www.bioline.org.br/ja Vol. 15 (1) 69 - 74 Influence of Water quality on the biodiversity of phytoplankton in Dhamra River Estuary of Odisha Coast, Bay of Bengal PALLEYI, S; KAR, R N; *PANDA, C R Institute of Minerals & Materials Technology, Bhubaneswar-751013, India *Corresponding author : [email protected] ABSTRACT: Dhamra estuarine ecosystem is a hotspot of rich biological diversity which supports a patch of mangrove along with unique flora and fauna. In this study, the diversity of phytoplankton population and other factors that control their growth and biodiversity were investigated. The samples were collected monthly from Dhamra estuary of Bay of Bengal at 6 different stations (grouped under three regions) from March -2008 to February -2009. A total of 41 genera of phytoplankton species belonging to 4 classes of algae were identified. The maximum value of 9.3 X 10 4 cells l -1 was recorded in post monsoon season. Phytoplankton of Bacillariophyceae, appearing throughout the year, and represent majority of population (75-94%) at all the sampling stations, followed by Dinophyceae (3-14%), Cyanophyceae (3-8%) and Chlorophyceae (0-4%) classes. The Shannon- weavers diversity index (H) remains between 0.22 and 2.49. Based on the correlation coefficient data, phytoplankton shows positive relationship with DO, salinity, nutrients and negative relationship with temperature and turbidity. Present study shows that the occurrence and diversity of these primary producers do not subscribe to a single dimensional phenomenon of a single factor, rather than, a consequence of a series of supported factors which will help to maintain and balance such type of fragile ecosystem.
    [Show full text]