Chemical Water Quality and Fish Component Analyses in the Periods of Before- and After-the Weir Constructions in Yeongsan River

Recent ecological stream restoration projects have focused on expanding the water-friendly space of streams, promoting the health of aquatic ecosystems, and restoring various habitats, which raise the need for relevant research. Applying integrated environmental analysis, this study quantifies the change in hydraulic characteristics before and after the restoration projects through physical habitat simulation and links the results of physical impacts to estimate benefits of increase in water quality and aquatic ecosystem health due to the implementation of the project. For this, the study area is a 3.3 km long reach of the Anyang-cheon Stream, Korea. Field monitoring revealed that five fish species are dominant and sub-dominant, and account for 76% of the total fish community. To assess the change of before and after ecological stream restoration project, the River2D and Coastal Modelling System (CMS)-Flow 2D models were used for hydraulic and water quality simulations, respectively. For the habitat simulation, the HSI (Habitat Suitability Index) model was used. In addition, the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI) was used to calculate changes in water quality index and to examine changes in habitat areas with an integrated quantitative index, the methodology of Zingraff-Hamed et al. was adopted. It was found that the ecological stream restoration project significantly increased for the eco-friendly area. In addition, the changes in water quality and habitat suitability grades before the ecological river restoration project were improved to two stages and one stage, respectively. This study applied the integrated analytical framework as a policy/project assessment tool and the results of this study will be useful for the integrated water management policy.

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Declining bacteria, lead, and sulphate, and rising pH and oxygen in the lower Mississippi River

AMBIO ◽

10.1007/s13280-020-01499-2 ◽

2021 ◽

Author(s):

R. Eugene Turner

Keyword(s):

Water Quality ◽

Mississippi River ◽

Pollution Abatement ◽

National Policy ◽

Quality Improvements ◽

Sulfur Dioxide Emissions ◽

Dramatic Decline ◽

Before And After ◽

Lower Mississippi River ◽

The 1960S

AbstractVarious air and water pollution issues in the US were confronted in the last 60 years using national policy legislation, notably the Clean Water Act and the Clean Air Act. I examine changes in the concentrations of bacteria, oxygen, lead, and sulphate at the terminus of the Mississippi River before and after these pollution abatement efforts. Microbial concentrations increased or were stable from 1909 to 1980 but decreased about 3 orders of magnitude after the 1970s, while the average oxygen content increased. A large decline in lead concentration occurred after the 1960s, along with a less dramatic decline in sulphate concentrations. The pH of the river dropped to a low of 5.8 in 1965 as sulfur dioxide emissions peaked and averaged 8.2 in 2019 after emissions declined. Decades of efforts at a national scale created water quality improvements and are an example for addressing new and existing water quality challenges.

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Laju Pertumbuhan Rumput Laut Gracilaria sp Melalui Budidaya IMTA (Integrated Multi Trophic Aquaculture) di Pantai Geger, Nusa Dua, Kabupaten Badung, Bali

Journal of Marine and Aquatic Sciences ◽

10.24843/jmas.2018.v4.i02.191-203 ◽

2017 ◽

Vol 4 (2) ◽

pp. 191

Author(s):

Kadek Yudiastuti ◽

I Gusti Bagus Sila Dharma ◽

Ni Luh Putu Ria Puspitha

Keyword(s):

Water Quality ◽

Design Method ◽

Salt Water ◽

Mesh Size ◽

General Characteristic ◽

Quality Parameters ◽

Seaweed Cultivation ◽

Randomized Design ◽

Physical And Chemical ◽

Chemical Water

Gracilaria sp is red alga which belong to class rhodophyceae. It can grow in shallow salt water with a general characteristic is having a cylindrical and branched thallus form. Seaweed cultivation can be performed through IMTA (Integrated Multi Trophic Aquaculture) method. The basic principle of cultivation through the IMTA method is utilizing service of the low thropic level species in marine ecosystems, such as shells and seaweed. This method is believed to be able to overcome the environmental problems caused by cultivation activities, such as feces and uneaten feed. This research was perfomed 45 days, from February 25 to April 11, 2017. It was held at Geger Beach, Nusa Dua, Badung Regency, Bali, using a complete randomized design method that consist of three treatments and three repetition for each treatment. Treatment control (T1) consisted of 10 bunches of seaweed 100 grams without the abalone, treatement 2 (T2) consisted of 10 bunches of seaweed 100 grams and 20 abalones and treatement 3 (T3) consisted of 10 bunches of seaweed 100 grams and 40 abalones. The result showed that specific growth rate in Gracilaria sp. was highest in treatment T1, compared to treatment T2 and T3. This was caused by the cage construction of abalone amd the present of small mesh size net to cover the seaweed planting, which made the growth was not optimal. However, the use of a nets system in seaweed cultivation could minimize the loss of thallus. It was proved by the survival rate of seaweed in first, second and third, that is averagely high, ranging from 90% to 100%. Physical and chemical water quality parameters are also measured, and It showed that the water quality was suitable for the cultivation of both, seaweed and abalone.

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Integrating Chemical, Water Quality, Habitat, and Fish Assemblage Data from the San Joaquin River Drainage, California

Integrated Assessment of Ecosystem Health ◽

10.1201/9781439822661.ch3 ◽

1999 ◽

Author(s):

Neil Dubrovsky ◽

Charles Kratzer ◽

Larry Brown

Keyword(s):

Water Quality ◽

Fish Assemblage ◽

River Drainage ◽

San Joaquin River ◽

Chemical Water

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Plankton and water quality variability in an estuary before and after the shrimp farming effluents: possible impacts and regeneration

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592017143406503 ◽

2017 ◽

Vol 65 (3) ◽

pp. 495-508

Author(s):

William Bauer ◽

Paulo Cesar Abreu ◽

Luis Henrique Poersch

Keyword(s):

Water Quality ◽

Quality Parameters ◽

Pacific White Shrimp ◽

Shrimp Farming ◽

Water Quality Parameters ◽

White Shrimp ◽

Zooplankton Abundance ◽

Patos Lagoon ◽

Short Period ◽

Before And After

Abstract Water quality, chlorophyll a, phytoplankton, proto and mezo-zooplankton abundance were spatiotemporally evaluated in an estuary receiving effluents from a Pacific white shrimp Litopenaeus vannamei farm in Patos Lagoon estuary, Southern Brazil. Samples were taken before (BD) and; 1 day (1 PD) 5 days (5 PD), 10 days (10 PD), 20 days (20 PD) and 30 days (30 PD) after the effluents discharge. Some water quality parameters were affected by the effluents discharge; however, these changes were restricted to a distance of 20 m from the effluent discharge channel for a period of 5 days. The microbial community was dominated by chlorophyceae, followed by diatoms, cyanobacteria and ciliates. There was an increase in the abundance of different groups on the 1 PD sampling compared to BD. The zooplankton abundance was low in practically all sites, except for 30 PD sampling. The meso-zooplanktonic organisms were represented by copepods, mostly Acartia tonsa. Despite some effects on water quality and phytoplankton and protozooplankton abundance until 5 PD sampling, these alterations dissipated in a short period of time. We conclude that the environment quickly assimilated the effluents discharge, and the water quality parameters remained within the limits stipulated by standard guidelines.

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Review of Wildfire Effects on Chemical Water Quality

10.2172/781455 ◽

2001 ◽

Cited By ~ 3

Author(s):

Kelly Bitner ◽

Bruce Gallaher ◽

Ken Mullen

Keyword(s):

Water Quality ◽

Wildfire Effects ◽

Chemical Water

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Analisa Kualitas Air Fisika dan Kimia di Danau Pampait (Physical and Chemical Water Quality Analysis in Lake Pampait)

Daun Jurnal Ilmiah Pertanian dan Kehutanan ◽

10.33084/daun.v7i1.1608 ◽

2020 ◽

Vol 7 (1) ◽

pp. 75-87

Author(s):

Ummi Suraya ◽

Lilia Lilia

Keyword(s):

Water Quality ◽

Dissolved Oxygen ◽

Aquatic Organisms ◽

Quality Analysis ◽

Middle Section ◽

Water Quality Analysis ◽

Average Temperature ◽

Physical And Chemical ◽

Chemical Water ◽

Quality Measurements

This study aims to determine the water condition of Lake Pampait, KamelohBaru Village, Sebangau District, Palangka Raya City, measured from physical and chemical water quality as a measure of the condition of the water quality in Lake Pampait. The study was conducted for approximately 2 (two) months, namely from June to July 2018. Sampling was carried out in 3 (three) stations, namely inlet (station I), middle section (station II) and outlets (station III). The physical and chemical water quality measurements are carried out directly, namely temperature, brightness, depth, pH (Degrees of Acidity) and DO (Dissolved Oxygen) while indirectly or analyzed in the laboratory are PO4 (Phosphate), NO3 (Nitrate) and NH3 (Nitrate) Ammonia). The results of research on physical and chemical water quality is an average temperature of 23.7 oC. Brightness 28.75 cm, Depth 4.25 m, Degree of Acidity (pH) with an average of 6.03, and Dissolved Oxygen (DO) 2.93 mg/L, Phosphate (PO4), Nitrate (NO3), and Ammonia (NH3) ) 0.932 mg/L, it can be concluded that Lake Pampait can be said to be still not polluted and is still considered good for the life of fish and other aquatic organisms.

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