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Aquaculture & Marine Biology

Research Article Volume 6 Issue 6

Bathymetric and Chemical Analysis of an Ox-Bow Lake in View of Aquaculture

Balai Chandra Das

Department of Geography University of Kalyani India

Correspondence: Balai Chandra Das Department of Geography Krishnagar Govt College under University of Kalyani West Bengal India, Tel 919475184957

Received: December 07, 2017 | Published: December 22, 2017

Citation: Das BC (2017) Bathymetric and Chemical Analysis of an Ox-Bow Lake in View of Aquaculture. J Aquac Mar Biol 6(6): 00174 DOI: 10.15406/jamb.2017.06.00174

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Abstract

Oxbow lakes provide most appropriate environment for aquaculture in deltaic plain. Nawpara Beel (swamp/lake) is the largest of five major oxbow lakes in the Community Development Block (CD Block) of Krishnagar –II. But for years it is left fallow and no aquaculture is being practiced for development of the poor fishermen community on its levees. Present paper studied channel morphometry and chemical quality of water in view of aquaculture in the beel. Variables of plan form geometry like radius of curvature, arc angle; bathymetric analysis of channel and water quality of the oxbow lake in terms of aquaculture were tested. Bathymetrically the beel is suitable for different type of aquaculture but water quality is not suitable for all type of aquaculture.

Keywords: Nawpara beel; Oxbow lake; Aquaculture; Water quality; Bathymetry

Abbreviations

A*= Channel Asymmetry; Al= Cross-Sectional area to the left of the Channel Centerline; Ar= Cross-Sectional Area to the right of the Channel Centerline; BDO= Block Development Officer; BOD= Biological Oxygen Demand; CD Block = Community Development Block; CfI= Channel Form Index; COD= Chemical Oxygen Demand; Ď = Depth of the most Efficient Channel; d= Observed Depth of the Channel; DO= Dissolved Oxygen; Id = depth index; Iw= width index; LAP= Least Action Principle; rc= Radius of Curvature; r = Radius of the Channel Cross-Section when it is Semicircular in Shape (ẃ/2); W = Observed Width of the Channel; ẃ = Width of the most Efficient Channel; Θ = Arc Angle

Introduction

Wetlands are areas where water is the primary factor controlling the environment and the associated plant and animal life [1]. They occur where the water table is at or near the surface of the land, or where the land is covered by water. Once treated as transitional habitats or seral stages in succession from open water to land, the wetlands are now considered to be distinct ecosystems [2,3] with specific ecological characteristics, functions and values. According to most widespread definition, wetlands are defined as: “lands transitional between terrestrial and aquatic eco-systems where the water table is usually at or near the surface or the land is covered by shallow water” [4]. Ramsar Convention on Wetlands defines wetlands as: “areas of marsh, fen, peat land or water, whether natural or artificial, permanent or temporary, with water that is static or flowing, fresh, brackish or salt, including areas of marine water the depth of which at low tide does not exceed six metres”. In addition, for the purpose of protecting coherent sites, the Article 2.1 provides that wetlands to be included in the Ramsar List of internationally important wetlands “may incorporate riparian and coastal zones adjacent to the wetlands, and islands or bodies of marine water deeper than six metres at low tide lying within the wetlands”.

It is increasingly realized that the planet earth is facing grave environmental problems with fast depleting natural resources and threatening the very existence of most of the ecosystems. Depletion of Wet lands is one of such serious concern being voiced among scientists, planners, sociologists, politicians, and economists to conserve and preserve. These water bodies are the kidneys of the environment. They sieves pollutants and toxic elements from water and provide fresh water for numerous lives living in wetlands. Wetlands are highly fertile with adequate nutrients for planktons, algae and other plants which are in turn the huge storehouse of food for aquatic animals. Fish, especially inland-water fish is the staple food for Bangalee. But greedy activities without any considerations of its consequences, leads those wetlands to deterioration rapidly. Irrational uses of lands are leading to progressive rate of siltation and rapid decrease in area and volume of wetlands. Moreover wetlands in urban and rurban areas are being closed at an alarming rate for constructional works.

Existing wetlands with lesser area and volume, receives thousands of tons of pollutants generated and induced by activities of modern man intoxicated by the power he has acquired through his scientific inventions and technological skills [5]. He has the one and only one motive of profit maximization. But closing or deterioration of wetlands are same as the damaged kidney in mammals which demands regular dialysis increasing living cost beyond capacity.

Tasty inland fishes are very rich in nutrients which provide the best diet for the inhabitants of the area concerned. But the number and variety of fishes have decreased sharply along with their nutrient quality and taste within few decades.

But slight change in the direction in the human motive could give remarkable but sustainable development for the whole community, not for one or two. Fate of wetlands of Nadia District is not different from said above. We have 176 wetlands [6] in the district with total area of 189 km2 and capacity of 159000000 m3. Nadia district shares 7.7% of total inland fresh water bodies of West Bengal and natural wetlands (beels) constitute lion share of these inland water bodies. Average production from these beels is only 500 – 1000 kg / hectare / year which can be raised 2000 – 3000 kg / hectare / year [7]. On ‘Matsya Chas Bisayak Aalochona Chakra’ organized by Nadia Zila Parishad and Fishery Department, Nadia it was reported that production of these beels (wetlands) under fishermen co-operative society was only 100 kg / hectare / year [8].

In C. D. Block Krishnagar – II, there are seven large wetlands. Most of them are with same fate as said before. But we could fuel our machinery of village – development with a sustainable but satisfactory speed by proper management of these beels (wetlands). We could get arsenic – free surface water for drinking, irrigation and cottage industries; water hyacinths and other aquatic weeds to manure our agricultural lands to have bumper production; fishes of high nutrients and taste which has mountain-peak market demand and price; vast extent of water bodies to promote duck farming and habitats for migrant birds. From the wetlands of Nadia district as many as 42 species of angiosperms belonging to 26 families and 2 species of pteridophytes were observed which are locally used for various purposes. Of these plants, 30 species have excellent medicinal properties [9]. Therefore proper management and use of these beels can make a miracle to the development of the weaker sections of the society who are dependent for their livelihood on those wetlands. But foremost task is knowing the beel- its bathymetry, water and biology. In this context present paper tried to bathymetric and chemical analysis of an ox-bow lake in view of aquaculture.

Materials and Methods

Variables of plan form geometry [10,11] of the oxbow lake like radius of curvature ( r c ) MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qadaqadaWdaeaapeGaamOCa8aadaWgaaqcfasaa8qacaWGJbaa paqabaaajuaGpeGaayjkaiaawMcaaaaa@3B47@ and arc angle (θ) were measured from satellite image. Bathymetric survey of the beel (oxbow lake) was done using GOL 26 Auto Level and accessories. On the basis of 18 cross sections along the beel, contour lines were drawn for understanding of in-channel terrain. Channel asymmetries ( A * ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qacaGGOaGaamyqa8aadaahaaqabKqbGeaapeGaaiOkaaaajuaG caGGPaaaaa@3A6E@  at 18 cross-sections were measured using formulae-

A * = ( A r A l ) A MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qacaWGbbWdamaaCaaajuaibeqaa8qacaGGQaaaaKqbakabg2da 9maalaaabaGaaiikaiaadgeapaWaaSbaaKqbGeaapeGaamOCaaqcfa 4daeqaa8qacqGHsislcaWGbbWdamaaBaaajuaibaWdbiaadYgaa8aa beaajuaGpeGaaiykaaqaaiaadgeaaaaaaa@42E1@  [12] (1)

Where Ar and Al represent right and left part of cross-sectional area to the channel centre line and

A= A r + A l MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qacaWGbbGaeyypa0Jaamyqa8aadaWgaaqcfasaa8qacaWGYbaa paqabaqcfa4dbiabgUcaRiaadgeapaWaaSbaaKqbGeaapeGaamiBaa qcfa4daeqaaaaa@3EED@

Ideal width (ẃ) of a channel provides tool to compare width of a natural channel of given cross-sectional area to that of the ideal width which the channel tries to follow least action principle (LAP) (Nanson, 2017) [13]. ẃ is defined as 2r when channel cross-section is semicircular in shape and calculated as ẃ =1.595√A. and width index (Iw) is defined as-

I w = w/w MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qacaWGjbWdamaaBaaajuaibaWdbiaadEhaa8aabeaajuaGpeGa eyypa0JaaeiiaiaadEhacaGGVaGaam4Daaaa@3DDD@  (2)

Where w = observed width of the channel. Width index (Iw) is a numerical tool to compare the shape of the river cross-sectional form, whether its width matches the width of most efficient channel or how much deviated from it. If Iw = 1, the width matches perfectly. >1 indicate wider and <1 indicate narrower channel. Ideal Depth (Ď) provides tool to compare depth of a natural channel of given cross-sectional area to that of the ideal depth which the channel tries to attain for best conveyance. Ď is defined as A/ẃ and depth index (Id) is defined as-

I d = d / Ď MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qacaWGjbWdamaaBaaajuaibaWdbiaadsgaaKqba+aabeaapeGa eyypa0JaaeiiaiaadsgacaqGGaGaai4laiaabccacaWGoeaaaa@3E95@ (3)

Where d = observed mean depth of the channel. Depth index (Id) is a numerical tool to compare the shape of the river cross-sectional form, whether its depth matches the depth of most efficient channel or how much deviated from it. If Iw= 1, the depth matches perfectly. >1 indicates deeper and <1 indicates shallower channel.

Whether a channel cross – section is relatively shallower or deeper can be readily measured by using channel form index ( C f I ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfa4aaeWaae aacaWGdbWaaSbaaKqbGeaacaWGMbaabeaajuaGcaWGjbaacaGLOaGa ayzkaaaaaa@3B6B@  which is formulated as-

( C f I )= W d 2.54 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfa4aaeWaae aacaWGdbWaaSbaaKqbGeaacaWGMbaabeaajuaGcaWGjbaacaGLOaGa ayzkaaGaeyypa0ZaaSaaaeaadaWccaqcfasaaiaadEfaaeaacaWGKb aaaaqcfayaaiaaikdacaGGUaGaaGynaiaaisdaaaaaaa@41FF@  [14] (4)

Zero, the lowest value of the index indicate extremely narrow channel. 1 indicates ideal width depth ratio above which larger is the value wider and shallower is the channel. Water quality was diagnosed using method APHA 21st Edition.

Results and Discussion

Nawpara Beel is an oxbow-lake originated as a rejected channel of the river Jalangi during late 18th or early 19th century (Das, 2013). Its geographical location is marked by latitudinal extension from 23° 29ʹ 51ʺ N to 23° 31ʹ 04ʺ N and longitudinal extension from 88° 28ʹ 40ʺ E to 88° 29ʹ 33ʺ E (Table 1 & 2). Length of beel is 4.9 km with perimeter 9.86 km. Radius of curvature (rc) of apex bend is 320m and of major curve is 897m. Longest distance of the beel from its mother river Jalangi, where from neck cut took place, is 3.04 km. The beel is deepest (>12 meters) to the north-west mid of the major curve and shallows gradually to be erased out to the south where from it was cut-off (Figure 1 & 2).

l. No.

Item

Value

1

Location

Latitude: 23° 29ʹ 51ʺ N to 23° 31ʹ 04ʺ N
Longitude: 88° 28ʹ 40ʺ E to 88° 29ʹ 33ʺ E

2

Length

4.9 km

3

Average width

211.87 meters

4

Radius of curvature

For minor curve 320 meters
For major curve 897 meters

5

Arc angle

For minor curve 254˚
For major curve 169˚

Table 1: Magnitude of plan view dimensions of Nawpara Beel.

Item

A

w

d

w/d

IW

Ď

Id

CfI

A*

Average

904.64

211.87

4.19

63.46

46.30

4.85

19.51

0.20

24.95

00.026

SD

493.39

26.57

2.17

34.72

13.31

1.26

5.61

0.05

13.65

00.001

CV

0.55

0.13

0.52

0.55

0.29

0.26

0.29

0.25

0.55

00.120

Table 2: Morphometry of the Nawpara Beel.

Figure 1: Arc between two inflexion points makes arc angle θ at centre. Higher the magnitude of θ( 270 0 ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaieaaaaaa aaa8qacqaH4oqCcaGGOaGaeSipIOJaaGOmaiaaiEdacaaIWaWaaWba aKqbGeqabaGaaGimaaaajuaGcaGGPaaaaa@3EAB@  indicates acute bend of meander of parent river and origin of oxbow lake is because of neck cut-off. Lower value of θ (≤ 180˚) of the oxbow lakes indicates its origin as chute cut-off. For Nawpara Beel, θ is 254˚ which indicates its origin as neck cut-off of parent river’s bend.

Figure 2: For the most efficient channel w/d ratio is 2.54. Average w/d ratio is 63.46 which indicate very shallow channel. Average I W MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaOaamysam aaBaaajuaibaGaam4vaaqabaaaaa@387D@ of Nawpara Beel 4.85 also indicates wider channel in compare to its cross-sectional area. Mean I d MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaOaamysam aaBaaajuaibaGaamizaaqabaaaaa@388A@ for the beel was 0.20 which indicate lesser depth. Value of C f I MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaqcfaOaam4qam aaBaaajuaibaGaamOzaaqcfayabaGaamysaaaa@39E2@  (24.95) also indicate wide shallow channel with low efficiency.

Different parameters of water quality of the beel were tested (Table 3) and reveal the health of the beel for aquaculture [15-18]. Suggested optimum level of Biological Oxygen Demand (BOD), Dissolved Oxygen (DO), Chemical Oxygen Demand (COD), pH, ammonia, temperature, turbidity etc for aquaculture in ponds. DO level in Nawpara Beel is much lower than recommended level >4 mg L-1. As the fishermen co-operative society associated with the beel is in dormant for a long period, the beel is almost covered by dense hyacinth for about 6 years. That is why DO level is far below the optimum level. Optimum range of pH for general aquaculture is 6 < pH < 9. In Nawpara Beel, pH of water is 7.12 which indicate good health of water in terms of acidity and alkalinity. Recommended BOD level should be <1.6 mg L-1. But in this present study, the value is 3. This again is because of eutrophication.

Sl. No.

Parameters

Result

Test Method Specification

Remarks

1

pH

7.12

APHA 21st Edition, 4500-H-B

Name of the wetland: Nawpara Beel

Date of sample collection: 12.06.2015 * Analysis completed on: 20.06.2015

2

Total Dissolved Solids (mg/l)

164

APHA 21st Edition, 2540 C

3

Total Suspended Solids (mg/l)

17

APHA 21 st Edition, 2540 D

4

Conductivity (μmhos/cm)

283.5

APHA 21st Edition., 2510 B

5

Dissolved Oxygen (mg/l)

0.29

APHA 21st Edition, 45000 C

6

Chemical Oxygen Demand (mg/l)

19

APHA 21st Edition, 5220 B

7

Biological Oxygen Demand (mg/l) 3 days at 270C

3

lS 3025 (Part 44):'1993

8

Iron as Fe (mg/l)

0.22

APHA 21st Edition, 3500-Fe B

9

Nitrate as NO3 (mg/l)

2.17

APHA 21st Edition, 4500-NO3 -E

10

Phosphate as PO4 (mg/l)

0.058

APHA 21st Edition, 4500 - P D

11

Sodium as Na (mg/l)

11.5

APHA 21st Edition, 3500 -Na B

12

Potassium as K (mg/l)

2.8

APHA 21st Edition, 3500 -K B

13

Cadmium as Cd (mg/l)

< 0.003

APHA 21st Edition, 3111 B

14

Chromium as Cr+6 (mg/l)

< 0.01

APHA 21st Edition, 3500 -Cr B

15

Copper as C (mg/l)

< 0.025

APHA 21st Edition, 3111 B

16

Lead as Pb (mg/l)

< 0.01

APHA 21st Edition, 3111 B

17

Nickel as Ni (mg/l)

< 0.02

APHA 21st Edition, 3111 B

18

Zink as Zn (mg/l)

0.01

APHA 21st Edition, 3111 B

Table 3: Physical and Chemical quality of water of Nawpara Beel.

Morphometry Rawson [19] of the Nawpara Beel (largest and deepest wetland in the CD Block Krishnagar-II) is very good for wide variety of aquaculture. Minor constraints about some chemical properties of water may readily be removed if the beel is cleared of hyacinths. Active involvement of inhabitants on its banks may enable the beel to sustain thousands of villagers on its banks [20-22].

Conclusion

Nawpara Beel is an oxbow lake originated as neck cut-off of an acute meander of the River Jalangi. Siltation has turned it into a much wide and shallow wetland in terms of channel efficiency. The beel is bathymetrically very good for variety of aquaculture but have some limitations in terms of chemical and biological properties of water.

Acknowledgement

Sincere gratitude to –Editor, Journal of Aquaculture & Marine Biology whose valuable mail acquainted me with the journal, Reviewers, for their valuable comments and proposals, and my students.

Conflict of Interest

No conflict.

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