Morphological Deformities inChironomusspp. (Diptera: Chironomidae) Larvae as a Tool for Impact Assessment of Anthropogenic and Environmental Stresses on Three Rivers in the Juru River System, Penang, Malaysia

2010 ◽  
Vol 39 (1) ◽  
pp. 210-222 ◽  
Author(s):  
Salman Al-Shami ◽  
Che Salmah M. Rawi ◽  
Siti Azizah M. Nor ◽  
Abu Hassan Ahmad ◽  
Arshad Ali
Keyword(s):  
Impact Assessment ◽  
River System ◽  
Environmental Stresses ◽  
Chironomidae Larvae ◽  
Three Rivers ◽  
Morphological Deformities

Random number generator or sewer water quality model?

2006 ◽  
Vol 54 (6-7) ◽  
pp. 387-394 ◽  
Author(s):  
P. Willems
Keyword(s):  
Water Quality ◽  
Environmental Impact ◽  
Impact Assessment ◽  
Environmental Impact Assessment ◽  
Random Number Generator ◽  
River System ◽  
Assessment Model ◽  
Integrated Modelling ◽  
Water Quality Modelling ◽  
Quality Model

Integrated urban drainage modelling and environmental impact assessment require sewer emission models to be linked with submodels for treatment infrastructure and receiving rivers. The uncertainty in current water quality modelling is, however, huge, and environmental impact assessment looses more and more credibility. Based on an integrated modelling case for a combined sewer – WWTP – river system, it is shown in the paper that the integrated model does not produce more accurate results in comparison with the random simulation of emission concentrations from a frequency distribution. This should, however, not pose a serious problem as in most applications of impact assessment, model results are not needed in real time but in statistical terms. Further investigation makes clear that detail/sophistication in water quality modelling is not so important, but that more focus has to be given to long-term simulations, the use of parsimonious models and model validation based on concentration frequencies.

scholarly journals Forecasting the discharge into Hoa Binh reservoir by applying the connecting model marine - imech1D

2008 ◽  
Vol 30 (3) ◽  
Author(s):  
Nguyen Tien Cuong ◽  
Trinh Thu Phuong
Keyword(s):  
Hydrological Model ◽  
River System ◽  
The Other ◽  
Hydrological Models ◽  
Flood Season ◽  
The Difference ◽  
Three Rivers ◽  
Hoa Binh

Da river is the biggest one of three rivers: Da, Thao and Lo which flow into Hong river, so calculating and forecasting correctly the discharge to Hoa Binh reservoir take an important role in managing the task of flood preventing in the Hong - Thai Binh river system. In this paper, a connected hydraulic-hydrological model is developed. The model was applied to forecast the discharge into Hoa Binh reservoir in the flood season 2006. The difference of this connected hydraulic-hydrological model in comparison with the other hydrological models is using the complete Saint-Venant 1D to simulate flow in rivers. Results of verification of the model show that it is good enough for practice.

scholarly journals Protist communities along freshwater–marine transition zones in Hudson Bay (Canada)

Elem Sci Anth ◽  
2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Loïc Jacquemot ◽  
Dimitri Kalenitchenko ◽  
Lisa C. Matthes ◽  
Adrien Vigneron ◽  
Christopher J. Mundy ◽  
...  
Keyword(s):  
River System ◽  
Amplicon Sequencing ◽  
Estuarine Circulation ◽  
Nutrient Concentrations ◽  
Hudson Bay ◽  
Transition Zones ◽  
Microbial Eukaryote ◽  
Microbial Eukaryotes ◽  
Species Overlap ◽  
Three Rivers

One of the most striking ecological divides on Earth is between marine and nearby freshwater environments, as relatively few taxa can move between the two. Microbial eukaryotes contribute to biogeochemical and energy cycling in both fresh and marine waters, with little species overlap between the two ecosystems. Arctic and sub-Arctic marine systems are relatively fresh compared to tropical and temperate systems, but details of microbial eukaryote communities along river-to-sea transitions are poorly known. To bridge this knowledge gap, we investigated three river-to-sea transitions (Nelson, Churchill, and Great Whale Rivers) in sub-Arctic Hudson Bay through 18S rRNA amplicon sequencing to identify microbial eukaryotes along the salinity and biogeochemical gradients. Salinity acted as the principal dispersal barrier preventing freshwater microorganisms from colonizing marine coastal waters, with microbial eukaryote communities of the three rivers clustering together. Just offshore, communities clustered by coastal regions associated with nutrient concentrations. Analysis of indicator species revealed that communities in the nitrate-depleted coastal water off the Churchill and Great Whale Rivers were dominated by heterotrophic taxa and small photosynthetic protists. In contrast, the Nelson offshore community was characterized by a high proportion of the diatom Rhizosolenia. A distinct community of heterotrophic protists was identified in the three estuarine transition zones, suggesting specialized estuarine communities. Such specialization was most marked in the Nelson River system that was sampled more intensely and showed estuarine circulation. The autochthonous community was composed of the bacterial grazers Katablepharis, Mataza, and Cryothecomonas, as well as brackish species of the diatoms Skeletonema and Thalassiosira. These findings suggest that flow regulation on the Nelson River that modifies estuarine circulation would affect estuarine community composition and distribution in the transition zone.

scholarly journals First detection of human sapoviruses in river water in South Africa

2013 ◽  
Vol 67 (12) ◽  
pp. 2776-2783 ◽  
Author(s):  
T. Y. Murray ◽  
J. Mans ◽  
M. B. Taylor
Keyword(s):  
South Africa ◽  
Water Samples ◽  
River System ◽  
Chain Reaction ◽  
Specific Primers ◽  
Potential Health ◽  
Taqman Probes ◽  
Polymerase Chain ◽  
Elution Method ◽  
Three Rivers

Over a 2-year period, from January 2009 to December 2010, water samples were collected from three rivers (Klip, Rietspruit and Suikerbosrand) in the Vaal River System, South Africa. Enteric viruses were recovered by a glass wool adsorption–elution method and concentrated using polyethylene glycol/sodium chloride precipitation. Sapoviruses (SaVs) were detected using published sapovirus (SaV)-specific primers and Taqman probes in a two-step real-time reverse transcription-polymerase chain reaction assay. Based on sequence analysis of the 5′-end of the capsid gene, SaVs were genotyped. In 2009, SaVs were detected in 39% (15/38) of samples from the Klip river, 83% (5/6) from the Rietspruit and 14% (1/7) of samples from the Suikerbosrand river. In 2010, SaVs were detected in 54% (14/26) of Klip river samples, 92% (11/12) from the Rietspruit and 20% (2/10) of samples from the Suikerbosrand river. SaV strains identified in the water samples were characterised into several GI and GII genotypes. The presence of SaVs in these rivers indicates human faecal contamination which may pose a potential health risk to persons exposed to these water sources during domestic or recreational activities.

scholarly journals Overview of the various factors impacting the distribution of river water of Punjab, India

2021 ◽  
Vol 889 (1) ◽  
pp. 012079
Author(s):  
Harinderpal Singh Bedi ◽  
Sandeep Singh
Keyword(s):  
River Water ◽  
River System ◽  
Comprehensive Analysis ◽  
Indus River ◽  
Policy Makers ◽  
Current Scenario ◽  
Surface Water Bodies ◽  
Major Factors ◽  
Three Rivers ◽  
Made In

Abstract Surface water bodies are one of the major sources of fresh water and also a matter of dispute among the territories sharing their water. Similar situation has been faced by Punjab, India, through which three rivers of Indus river system i.e., Ravi, Beas and Satluj passes. This article presents the various factors that need to be considered before distributing the water of the rivers of Punjab among neighboring states and countries. This article highlighted that the major factors that should be considered are, precipitation, snow fall, glacier retreat, demography, irrigation pattern, groundwater level, hydro-electricity and flooding. Further, the data from previous years for each factor has also been discussed so that any timely change in these factors could be highlighted. In this way, it was illustrated that distribution of river water should be based on the current scenario of the previously mentioned factors. The discussion made in this article may assist the policy makers in making a comprehensive analysis of the situation before distributing the river water of Punjab, India.

scholarly journals Environmental Impact Assessment Plan Due to Sediment Sluicing at Dams Along Mimikawa River System

2018 ◽  
Vol 13 (4) ◽  
pp. 709-719 ◽  
Author(s):  
Takeshi Yoshimura ◽  
Hiroki Shinya ◽  
◽  
Keyword(s):  
Environmental Impact ◽  
Impact Assessment ◽  
Environmental Impact Assessment ◽  
Physical Environment ◽  
River System ◽  
River Channel ◽  
Bridge Piers ◽  
Dam Reservoirs ◽  
System 2 ◽  
Flooding Risk

The 2005 typhoon disasters taught us that the Mimikawa River system in Miyazaki Prefecture had various problems with sediments in the river basin (the riverbed in dam reservoirs rise so much that flooding risk increases, sediments captured at dams granulate the downstream river channel and destabilize the bridge piers in the downstream river channel). In one of the approaches to solve these problems simultaneously, since 2017, sediment sluicing at a series of dams has been operated cooperatively. Using this approach, we can expect that the river will recover its continuity of sediment movement, returning its physical environment and animal habitats to their original states. Based on environmental surveys and numerical analyses of the current conditions, we have predicted the environmental impacts due to sediment sluicing at dams and defined the method to assess them. This paper presents: 1) an overview of sediment sluicing at dams in the Mimikawa River system, 2) the analysis of the river environment prior to operating sediment sluicing at dams, 3) the prediction of the impacts of sediment sluicing at dams in the river environment, 4) the environmental impact assessment after operating sediment sluicing at dams.

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