scholarly journals KAJIAN KUALITAS AIR DALAM EVALUASI PENGEMBANGAN PERIKANAN DI WADUK IR. H. DJUANDA, JAWA BARAT

2017 ◽  
Vol 14 (1) ◽  
pp. 15
Author(s):  
Didik Wahju Hendro Tjahjo ◽  
Sri Endah Purnamaningtyas
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Column ◽  
Fish Species ◽  
Organic Materials ◽  
Primary Source ◽  
Fish Culture ◽  
Water Sampling ◽  
Pressure Source ◽  
Carry Capacity

Budi daya ikan di Waduk Ir. H. Djuanda (A=8.300 ha, Zmax=95 m, dan Z=36,5 m) berkembang sangat pesat, sehingga berdampak pada penurunan kualitas air. Tujuan penelitian ini adalah untuk mengevaluasi kualitas air bagi kepentingan perikanan dan mengidentifikasi sumber tekanan tertinggi di Waduk Ir. H. Djuanda. Pengambilan data dilakukan setiap bulan dan tahun 2004 sampai dengan 2006. Pengamatan kualitas air dilakukan dengan metode pengambilan contoh air secara horisontal dan vertikal. Hasil penelitian menunjukkan bahwa sumber utama degradasi kualitas air adalah bahan organik yang berasal dari Waduk Cirata. Distribusi vertikal oksigen terlarut di perairan menunjukkan ada stratifikasi dengan kedalaman epilimnion yang sangat tipis. Berdasarkan pada analisis kandungan fosfat dan nitrogen, waduk ini telah mengalami perubahan dari eutrofik (tahun 2004) menjadi hipereutrofik (tahun 2005 dan 2006). Degradasi tersebut cenderung meningkat seiring dengan peningkatan jumlah unit karamba jaring apung yang dikembangkan di Waduk Cirata dan Waduk Ir. H. Djuanda. Kondisi ini menunjukkan bahwa pengembangan kegiatan budi daya dalam karamba jaring apung telah melampaui daya dukung dan cenderung mencemari perairan. Upaya mengatasi degredasi tersebut dapat dilakukan dengan 2 cara, yaitu 1) mengurangi usaha budi daya ikan dalam karamba jaring apung di Waduk Ir. H. Djuanda dan Cirata dan 2) menebarkan jenis ikan yang mampu memanfaatkan plankton secara efektif. Development of fish culture in Ir. H. Djuanda Reservoir has been expanded very fast, so it might cause the degradation of water qualities. The aims to evaluated water quality for fisheries purpose and identify the primary pressure source in Ir. H. Djuanda Reservoir. The data were collected every month during year of 2004 to 2006. Water sampling was done by vertical and horizontal. The result indicates that the primary source degradation of water qualities was organic materials from Cirata Reservoir. Stratification of dissolved oxygen in the water column indicates with very thin epilimnion layer. Based on phosphate and N-compuonds analysis, Ir. H. Djuanda Reservoir was changed from eutrophic in year 2004 to hipereutrophic in year 2005 and 2006. The degradation tends to increase with developing floating cage unit numbers in Cirata and Ir. H. Djuanda Reservoir. This condition shows that the development of fish culture in floating cage seems have be over the carry capacity of reservoir and tend to spread the pollution in the water. It effort suggest that the would two ways, i.e. 1) decrease of fish culture activities using be done refering floating cages in Ir. H. Djuanda and Cirata Reservoir and 2) stocking of fish species which are capable to utilized the plankton effectively.

scholarly journals Analisis Kondisi Kualitas Air Pada Budidaya Ikan Kerapu Tikus (Cromileptes altivelis) Di Situbondo [Analysis Of Water Quality Conditions On Humpback Grouper Culture (Cromileptes altivelis) In Situbondo]

2019 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Ervany Eshmat N, Abdul Manan
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Economic Value ◽  
International Markets ◽  
Fish Culture ◽  
Quality Analysis ◽  
Local Market ◽  
Descriptive Method

Abstract The humpback grouper (Cromileptes altivelis) is one of the fishery commodities with high economic value in both local and international markets. The price of humpback grouper can reach Rp. 200,000 - Rp. 400,000 / kilogram in the local market. The humpback grouper is potentially to be developed in most coastal areas of Indonesia. The conditions of water quality have a very important role for the success of fish culture of humpback grouper. To that end, monitoring and management of water quality are necessary in fish culture. The purpose of this case study is to determine the water quality conditions on humpback grouper culture in BBAP, Situbondo. The study was conducted on 16 January until 16 February 2012. The study method use descriptive method. From the results of water quality analysis, the water in humpback grouper broodstock ponds (I1 and I2) is no smell, no colour water, temperature 26.1-30 oC, salinity 27-35 ppt, dissolved oxygen 3.3-3.9 ppm, ammonia levels <0.001-0.22 ppm, nitrite levels 0.0075-0.085 ppm, alkalinity 110-120 ppm and pH 7.94-8.18. The water in humpback grouper hatchery ponds (B1 and B2) is no smell, green colour water, temperature 26.7-29.3 oC, salinity 27-34 ppt, dissolved oxygen 2.7-3.7 ppm, ammonia levels 0.0781-0.28 ppm, nitrite levels 0.0225-3.3305 ppm, alkalinity 94-126 ppm, and pH 7.14-7.81.

Hydrology and Water Quality Survey Near the Gezhouba Dam in the Winter

2013 ◽  
Vol 726-731 ◽  
pp. 3256-3261
Author(s):  
Jia Fei Zhou ◽  
Cong Feng Wang ◽  
De Fu Liu ◽  
Jing Wen Xiang ◽  
Ping Zhao ◽  
...  
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Flow Velocity ◽  
Water Column ◽  
Quality Data ◽  
Chinese Sturgeon ◽  
Water Quality Data ◽  
Gezhouba Dam ◽  
Survival Condition

Filed hydrology and water quality data were collected near the Gezhouba Dam early December of 2012 to analyze the response of Chinese Sturgeon survival condition to water temperature, dissolved oxygen (DO), pH, transparency (SD) and bottom flow-velocity. The results showed that water temperature lag is unconspicuous. The water temperature of Gezhouba Dam Sanjiang (GDS) was lower than that of Gezhouba Dam River (GDR), and it hindered propagation of sturgeon eggs. DO decreased fast in the vertical water column of GDS, pH ranged from 7.5 to 7.71. The hydrology and water quality were suitable for the life condition of sturgeon eggs and fry, except index of bottom flow-velocity.

Tools to forecast climate change effects on lakes's water column

2020 ◽  
Author(s):  
José Rodolfo Scarati Martins ◽  
Lais Ferrer Amorim ◽  
Fabio Ferreira Nogueira ◽  
Fabio Paiva da Silva
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Column ◽  
Climate Changes ◽  
Driving Forces ◽  
Environmental Research ◽  
Mixing Condition ◽  
Mixing Regime ◽  
Lakes And Reservoirs

&lt;p&gt;Lakes and reservoirs are environments with many important uses in social activities, such as hydropower generation, water supply, landscape element, irrigation and flood containment. An ecosystem with so many environmental services needs to have its water quality well preserved, and besides that, inland waters have a key role in climate change studies, because of their faster response to variability in external forces.&lt;/p&gt;&lt;p&gt;Water circulation in a reservoir is the result of a combination of morphometry and energetic driving forces. A lake&amp;#8217;s hydrodynamic characteristics vary with morphometric, meteorological and hydrological conditions. The heat balance involves exchanges at the surface, which are actively mixed and energised by the transfers occurring at the air-water interface, and also the exchanges in the water-soil interface near the banks and bottom, which depend on currents and internal waves; while in the main water column, the heat transfer is influenced by light penetration.&lt;/p&gt;&lt;p&gt;In the context of climate changes and water scarcity worldwide, the development of tools to better understand, maintain and improve water quality in lakes and reservoirs becomes an essential ally to environmental research and limnology. This research aims to demonstrate the lake mixing regime by a different approach, testing two different methods to forecast the climate change influence on a lakes&amp;#8217; mixing regime, using data from climate models.&lt;/p&gt;&lt;p&gt;The first tool is a thermal limit curve proposed by the authors which can forecast water column thermal limits for stability or mixing condition in a lake, based on wind speed, radiation and water profile temperature data. The second applied tool is a quasi-3D mathematical model, well known and reputed in the simulation field.&lt;/p&gt;&lt;p&gt;The results obtained for different experimental lakes in temperate and tropical zones showed that both methods have a good performance in representing lakes hydrodynamics accurately. The curve allows a faster response and minor need for data input, on the other hand, the quasi-3D models are capable to produce more detailed results. Possibly in the lakes&amp;#8217; management, it would be more indicated the use of those two methods together, using the curve to analyse faster the period's trend and be able to delimitate the exact period which needs more detailed studies.&lt;/p&gt;&lt;p&gt;The climate change simulations conducted for two experimental lakes considering different scenarios of climate changes showed the driving forces' strong influence on the lake's mixing regime. The number of mixing events is an interesting proxy to analyse this influence. It was greater in the pessimistic scenarios but still less than in the current situation. This means longer periods of stratification, which can cause dissolved oxygen depletion in the deeper layers.&lt;/p&gt;&lt;p&gt;The pessimistic scenarios have mixing events with greater amplitude, which results from a powerful stratification in previous periods. Mixing events with greater amplitudes create higher vertical velocities, resuspending more organic load and dropping dissolved oxygen levels along the water column, impairing the water quality.&lt;/p&gt;

scholarly journals Tingkat dan laju penurunan kualitas air di DAS Brantas Malang Raya

2019 ◽  
Vol 5 (2) ◽  
pp. 185
Author(s):  
Ima Yudha Perwira
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Organic Materials ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Decrease Rate ◽  
Better Than

The decrease level of water quality of Brantas Watershed in Malang Raya was observed in this study. The aim of this study was to observe the decrease level of water quality of Brantas Watershed from Batu to Malang City. This study was carried out in the Brantas Watershed of Malang Raya (8 stations: A, B, C, D, E, F, G, and H) for 18,4 Km. The water quality parameters observed in this study were: CODmn (permanganometry), CODcr (CODmn correlation based analysis), dissolved oxygen (DO) (Winkler iodometry), TDS and electrical conductivity (EC) (EC meter), pH (pH meter), and turbidity (Turbidity meter). The result showed the value of CODmn: 1,8-10,2 mg/L, CODcr: 5,6-31,5 mg/L, DO: 4,0-6,1 mg/L, TDS: 204-289 mg/L, EC: 430-617 µS/cm, pH: 7,1-7,6, and turbidity: 2,02-10,30 NTU. There are 3 stations (A, B, and C) with 1st class water quality, 1 station (D) with the 2nd class water quality, and 4 stations (E, F, G, and H) with 3rd class water quality. The decrease of water quality in the Brantas Watershed from Batu to Malang City was up to 3 times with a decrease rate of 2,3 mg/L-1Km-1. The decomposition of organic materials in the water of Batu City and western part of Malang City is relatively better than that of central parts of Malang City which might be caused by the over capacity of recovery (Self-purification mechanism).

scholarly journals Adaptive Water Sampling Device for Aerial Robots

Drones ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 5 ◽  
Author(s):  
Cengiz Koparan ◽  
A. Bulent Koc ◽  
Charles V. Privette ◽  
Calvin B. Sawyer
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Water Samples ◽  
Sensor Node ◽  
Activation Mechanism ◽  
Water Sampling ◽  
Sampling Device ◽  
Sampling Locations

Water quality monitoring and predicting the changes in water characteristics require the collection of water samples in a timely manner. Water sample collection based on in situ measurable water quality indicators can increase the efficiency and precision of data collection while reducing the cost of laboratory analyses. The objective of this research was to develop an adaptive water sampling device for an aerial robot and demonstrate the accuracy of its functions in laboratory and field conditions. The prototype device consisted of a sensor node with dissolved oxygen, pH, electrical conductivity, temperature, turbidity, and depth sensors, a microcontroller, and a sampler with three cartridges. Activation of water capturing cartridges was based on in situ measurements from the sensor node. The activation mechanism of the prototype device was tested with standard solutions in the laboratory and with autonomous water sampling flights over the 11-ha section of a lake. A total of seven sampling locations were selected based on a grid system. Each cartridge collected 130 mL of water samples at a 3.5 m depth. Mean water quality parameters were measured as 8.47 mg/L of dissolved oxygen, pH of 5.34, 7 µS/cm of electrical conductivity, temperature of 18 °C, and 37 Formazin Nephelometric Unit (FNU) of turbidity. The dissolved oxygen was within allowable limits that were pre-set in the self-activation computer program while the pH, electrical conductivity, and temperature were outside of allowable limits that were specified by Environmental Protection Agency (EPA). Therefore, the activation mechanism of the device was triggered and water samples were collected from all the sampling locations successfully. The adaptive water sampling with Unmanned Aerial Vehicle-assisted water sampling device was proved to be a successful method for water quality evaluation.

scholarly journals STUDI ANALISIS KUALITAS AIR SUNGAI BAH BIAK KOTA PEMATANGSIANTAR

2021 ◽  
Vol 17 (2) ◽  
pp. 117-124
Author(s):  
Ewin Handoco
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Quality Standards ◽  
Quality Standard ◽  
Quality Parameters ◽  
Water Sampling ◽  
Total Dissolved Solid

High community activity on the border of the Bah Biak River causes pollution in the waters of the river. The increase in the number of settlements and industries in Pematangsiantar city certainly has an impact on the quality of its waters. The purpose of this study is to find out the water quality of the Bah Biak River in Pematangsiantar City covering the physical and chemical parameters of the waters. This research was conducted in 2021 in Bah Biak River Pematangsiantar city. Water sampling in the Bah Biak River is carried out with three repetitions, namely in March, June and August taking into account the representation of the seasons. Water sampling is carried out in situ for parameters of brightness, pH, total dissolved solid (TDS), electrical delivery, temperature and dissolved oxygen (DO), ammonia, while for laboratory scale measurements are carried out for biologycal oxygen demand (BOD) and chemical oxygen demand (COD) parameters. The results of the measurement will be displayed in graphic form and descriptively discussed by referring to the specified quality standards. Based on the results of measurements of several water quality parameters in the Bah Biak River, it can be concluded that the majority of the parameters studied still meet the quality standards but there are parameters that have passed the quality standard threshold, namely BOD and ammonia parameters.   ABSTRAK Tingginya aktivitas masyarakat di sempadan Sungai Bah Biak menyebabkan pencemaran di perairan sungai tersebut. Peningkatan jumlah pemukiman dan industri di Kota Pematangsiantar tentu berdampak kepada kualitas perairannya. Tujuan penelitian ini adalah untuk mengetahui kualitas air sungai Bah Biak di Kota Pematangsiantar meliputi parameter fisik dan kimia perairan. Penelitian ini dilakukan pada tahun 2021 di Sungai Bah Biak Kota Pematangsiantar. Pengambilan sampel air di Sungai Bah Biak dilakukan dengan tiga kali pengulangan yaitu pada bulan Maret, Juni dan Agustus dengan mempertimbangkan keterwakilan musim. Pengambilan sampel air dilakukan secara insitu untuk parameter kecerahan, pH, total dissolved solid (TDS), daya hantar listrik, suhu dan dissolved oxygen (DO), ammonia, sedangkan untuk pengukuran skala laboratorium dilakukan untuk parameter biologycal oxygen demand (BOD) dan chemical oxygen demand(COD). Hasil pengukuran akan ditampilkan dalam bentuk grafik dan dibahas seacara deskriptif dengan merujuk pada baku mutu yang ditetapkan. Berdasarkan hasil pengukuran beberapa parameter kualitas air di Sungai Bah Biak maka dapat disimpulkan bahwa mayoritas parameter yang diteliti masih memenuhi baku mutu namun terdapat parameter yang telah melewati ambang baku mutu yaitu parameter BOD dan ammonia. Kata Kunci: kualitas air, aktivitas masyarakat, pencemaran, baku mutu, Sungai Bah Biak

scholarly journals Impact of Armored Shorelines on Shore-Zone Fish Density in a Mid-Atlantic, USA, Estuary: Modulation by Hypoxia and Temperature

2017 ◽  
Vol 41 (S1) ◽  
pp. 144-158 ◽  
Author(s):  
Richard G. Balouskus ◽  
Timothy E. Targett
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Fish Species ◽  
Fundulus Heteroclitus ◽  
Fish Density ◽  
Estuarine Fish ◽  
Menidia Menidia ◽  
Shore Zone ◽  
Water Conditions

Abstract Anthropogenic modifications of estuarine environments, including shoreline hardening and corresponding alteration of water quality, are accelerating worldwide as human population increases in coastal regions. Estuarine fish species inhabiting temperate ecosystems are adapted to extreme variations in environmental conditions including water temperature, salinity, and dissolved oxygen across seasonal, daily, and hourly time scales. The present research utilized quantitative sampling to examine the spatiotemporal distribution of shore-zone estuarine fish species in association with four unique shoreline types across a range of water temperature and dissolved oxygen conditions. Fish were collected from the intertidal and shallow subtidal region of four shoreline types, Spartina alterniflora marsh, Phragmites australis marsh, riprap, and bulkhead, in the summer and fall of 2009 and 2010. Analyses were performed to (1) compare mean fish density among shoreline types across all water conditions and (2) explore relationships of the complete fish assemblage, three functional species groupings, and two fish species (Fundulus heteroclitus and Menidia menidia) to unique shoreline/water conditions. Significantly greater mean fish densities were found along S. alterniflora shorelines than armored shorelines. Several metrics including fish density, species richness, and occurrence rates suggest S. alterniflora shorelines may serve as a form of refuge habitat during periods of low dissolved oxygen and high temperatures for various species, particularly littoral-demersal species including F. heteroclitus. Potential mechanisms that could contribute to a habitat providing refuge during adverse water quality conditions include tempering of the adverse condition (decreased temperatures, increased dissolved oxygen), predation protection, and increased foraging opportunities.

scholarly journals KANDUNGAN BAHAN ORGANIK SEDIMEN DAN KADAR H2S AIR DI DALAM DAN DI LUAR TEGAKAN MANGROVE DESA BEDONO, KABUPATEN DEMAK

2018 ◽  
Vol 7 (1) ◽  
pp. 78-85
Author(s):  
Halimatus Sa’diyah ◽  
Norma Afiati ◽  
Pujiono Wahyu Purnomo
Keyword(s):  
Organic Matter ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Organic Material ◽  
Organic Materials ◽  
Current Speed ◽  
Survey Method ◽  
Water Sampling ◽  
Mangrove Area ◽  
Surrounding Environment

Kawasan mangrove dapat memproduksi bahan organik dari proses dekomposisi serasah yang jatuh yang menjadi penyuplai nuterien ke lingkungannya. Proses tersebut menggunakan oksigen terlarut yang apabila oksigen terlarut habis maka proses tersebut beralih ke proses dekomposisi secara anaerob yang menyebabkan terbentuknya senyawa H2S. Penelitian ini bertujuan untuk mengetahui perbedaan kandungan bahan organik sedimen dan kadar H2S air di dalam dan di luar kawasan mangrove serta untuk mengetahui hubungan kandungan kadar H2S air dengan bahan organik sedimen dan oksigen terlarut di kawasan mangrove desa Bedono. Metode penelitian adalah metode survey. Penelitian ini dilakasanakn pada bulan Mei- Juni 2017 di lokasi yang mewakili kawasan mangrove dan lingkungan sekitarnya. Data yang diukur adalah suhu air, kecerahan, kedalaman, kecepatan arus, oksigen terlarut, pH, bahan organik sedimen dan H2S air yang dilaksanakan empat kali dengan selang pengukuran dua minggu. Hasil yang didapat yaitu suhu air 28-31oC, kecerahan 14,5-68 cm, kedalaman 33-165 cm, kecepatan arus 0-0,1 m/s, oksigen terlarut , pH 5-6, bahan organik sedimen 7,73-20,27%, H2S air 0,003-0,037 mg/l. Kandungan bahan organik sedimen dan kadar H2S air tertinggi di dalam kawasan mangrove dengan rata-rata 16,36% dan 0,031 mg/l, dan terendah di luar kawasan mangrove dengan rata-rata 9,78% dan 0,01 mg/l. Kadar H2S tinggi di dalam kawasan mangrove dan lebih rendah di luar kawasan mangrove. Kadar H2S air dengan bahan organik sedimen dan oksigen terlarut berhubungan linier dengan persamaan H2S= 0,027 + 0,001BOS- 0,006 DO (r= 0,7246, BOS= Bahan Organik Sedimen, DO= Dissolved Oxygen). Mangroves produce organic matter from the decomposition of falling leaves, twigs etc, which supply nutrient to the environment. The process uses dissolved oxygen; when dissolved oxygen exhausted, it switches into anaerobic decomposition which causes the formation of H2S compounds. This study aims to knowing differences in sediment organic materials and H2S within and adjacent of mangrove areas and to determine the relation of H2S with sediment organic materials and dissolved oxygen in the mangrove areas of Bedono. Survey method is refered, and the study was conducted in May - June 2017 on locations representing mangrove areas and the surrounding environment. The data measured are water temperature, brightness, depth, current speed, dissolved oxygen, pH, sediment organic materials and H2S in the water. Sampling was conducted four times every fortnight. The result of the water temperature is  28-31 ° C, brightness 14.5 to 68 cm, 33-165 cm depth, current speed 0-0.1 m/s, dissolved oxygen 2-5,2 mg/l, pH 5-6, sediment organic material 7,73 to 20.27%, H2S 0.003 to 0.037 mg/l. Sediment organic materials and H2S were highest within the mangrove area, with an average 16.36% and 0.031 mg/l, and the lowest outside of mangrove area with an average 9.78% and 0.01 mg/l. H2S higher in the inside of  the mangrove areas compared to the outside of it. The relation of H2S with sediment organic materials and dissolved oxygen is linearly related according to the equation H2S= 0.027+ 0.001SOM- 0.006DO (r= 0.7246, SOM= Sediment Organic Materials, DO= Dissolved Oxygen).

scholarly journals Monthly Variations of Physico-Chemical Factors of Keenjhar Lake, Sindh, Pakistan

2019 ◽  
Vol 10 (1) ◽  
pp. 29-35
Author(s):  
Shahina Rao ◽  
Muhammad Arshad Azmi ◽  
Solaha Rahman
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Air Temperature ◽  
Lake Water ◽  
Fish Culture ◽  
Physico Chemical ◽  
Permissible Range ◽  
Chemical Factors ◽  
Monthly Variations

The present study was carried out with the aim to assess water quality using physico-chemical factors ofKeenjhar lake. For this purpose, lake water was analyzed with regular intervals. The air temperature ranged between 21°C to 38 °C, water temperature between 19 °C to 36 °C , pH 5.5 to 8, dissolved oxygen 2.26 mg/L to 6.81 mg/L,salinity 0.16 mg/L to 1.13 mg/L, alkalinity from 30 mg/L to 165 mg/L, acidity 8 to 110 mg/L, sulphate 2.6 mg/L to 310mg/L, phosphate from 1 mg/L to 31 mg/L and nitrates 16 mg/L to 180 mg/L during 2006, 2007 and 2008. It wasconcluded that various parameters lie within the permissible range except in a few months and suitable for drinking,irrigation and fish culture purposes.

Sediment Resuspension and Dissolved Oxygen Levels Associated with Ship Traffic: Implications for Habitat Remediation

1997 ◽  
Vol 32 (2) ◽  
pp. 421-438 ◽  
Author(s):  
K.N. Irvine ◽  
I.G. Droppo ◽  
T.P. Murphy ◽  
A. Lawson
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Column ◽  
Suspended Sediment ◽  
Life Stage ◽  
Sediment Resuspension ◽  
Bed Sediment ◽  
Sediment Samples ◽  
Slip Area

Abstract Many of the Great Lakes Areas of Concern include harbours and navigable channels that experience disturbance of bed sediment due to the passage of large ships. Sediment resuspension due to ship passage may impact efforts to restore habitat and remediate contaminated bed sediment through in situ treatment. To examine the impacts of ship passage, water column profiles of temperature, pH, turbidity and dissolved oxygen, as well as suspended sediment samples, were taken at varying distances behind ships entering an industrial slip area of the Hamilton Harbour Area of Concern during the summer of 1995. Weekly water column profiles and suspended sediment samples also were collected at three sites in the slip area and a harbour control site to characterize ambient water quality. Ship passage significantly increased turbidity above ambient levels due to sediment resuspension, although the increase was less in the deeper areas of the slip. Levels of turbidity and suspended sediment concentration associated with ship passage exceeded that recommended for a moderate level of fish habitat protection. In association with the increased turbidity, levels of dissolved oxygen declined and often were less than 5 and 6.5 mg L-1, the Canadian Water Quality Guideline for later life stage warm and cold water fisheries, respectively. Based on the sample data and in situ flume experiments, the estimated depth of bed erosion due to a ship passage ranged from 1 to 8 mm. The impacts of sediment disturbance due to a ship passage should be considered when selecting and designing appropriate sites and technologies for remediation.

Sign in / Sign up

Export Citation Format

Share Document