Assessment of impacts from various hydro-ecological factors on oxygen budgets of a regulated river: a case study of the Petchburi River, western Thailand

2014 ◽  
Vol 69 (7) ◽  
pp. 1565-1572 ◽  
Author(s):  
Pichasit Sangmek ◽  
Charumas Meksumpun
Keyword(s):  
Water Quality ◽  
Aquatic Plant ◽  
Ecological Factors ◽  
River System ◽  
Ammonium Nitrogen ◽  
Regulated River ◽  
River Section ◽  
Nitrogen Levels ◽  
Discharge Regulation

Investigations of dissolved oxygen (DO) levels and related water quality in the Petchburi River, a regulated river system in western Thailand, were conducted at 3-month intervals from May 2010 to February 2012. The results indicated generally good water quality with DO levels >4 mg L−1. Variations in water quality, particularly the DO and ammonium nitrogen levels along the river, occurred due to discharge regulation and the natural characteristics of the river. The processes which contribute to DO levels include natural saturation (ca 57–78% in the upper river section and ca 44–76% in the lower river section) and aquatic plant DO production (ca 20–36% in the upper river section and ca 24–50% in the lower river section) which is also significant, while re-aeration would be less effective. The DO contribution from pondweed (family Potamogetonaceae) was of interest because of its successional capacity. Future control of river quality will require suitable management of aquatic plant species for conservation purposes.

scholarly journals Water-quality modelling of the Upper Mersey river system using an object-oriented framework

2001 ◽  
Vol 3 (3) ◽  
pp. 173-194 ◽  
Author(s):  
Maria Spanou ◽  
Daoyi Chen
Keyword(s):  
Water Quality ◽  
Water Quality Management ◽  
Object Oriented ◽  
River System ◽  
Low Flow ◽  
Quality Model ◽  
Water Quality Simulation ◽  
The United Kingdom ◽  
Frequency Curves

The aim of this paper is to present the recent advances in the development of an object-oriented software system for water-quality management, and discuss the results from its application to the study of the Upper Mersey river system in the United Kingdom. The software has been extended and includes tools for the construction of flow duration and low-flow frequency curves using different methods, the sensitivity analysis and parameter estimation of the water-quality model, and the stochastic simulation of the mass balance at the discharge points of point-source effluents. The application of object-orientation has facilitated the extension of the software, and supported the integration of different models in it. The results of the case study are in general agreement with published values. They also include low flow estimates at the ungauged river sites based on actual data for the artificial sources, and water-quality simulation results, which have not been presented earlier in the literature for the Upper Mersey system.

scholarly journals The effect of ecological restoration based artificial reoxygenation on water quality Improvement of urban river water

2018 ◽  
Vol 246 ◽  
pp. 02037
Author(s):  
Nan Luo ◽  
Changying Hu ◽  
Weiyu Li ◽  
Tao Xie ◽  
HuiLi Gong ◽  
...  
Keyword(s):  
Water Quality ◽  
Ammonium Nitrogen ◽  
Urban River ◽  
In Situ Remediation ◽  
Quality Degradation ◽  
Total Phosphorous ◽  
Filter Bed ◽  
Microbial Agents

Urban river pollution sources such as Combined Sewer Overflows (CSOs) or Illegally Discharging of Industrial Waste (IDIW) are generally hard to control on-site and cause serious water quality degradation problems across the nation. Therefore developing effective in-situ remediation techniques for urban rivers is of great interest. In this research we combined river reoxygenation, artificial floating island and microbial agents technologies (O-AFI-MA) to developed a comprehensive in-situ remediation technique and obtained water quality data from Sunhe River case study to evaluate its effectiveness. Our discovery indicates that the O-AFI-MA technique effectively improves water quality by reducing chemical oxygen demand (CODCr), total phosphorous (TP), ammonium nitrogen (NH4+-N) level by 45.9%, 61.31, 7.66% respectively and our technique enhances the natural degradation rate by raising the dissolved oxygen (DO) level from 2.8mg/L to 10mg/L upstream. The case study suggests that the sediment accumulation from CSOs and the subsequent internal source release causes great water quality degradation for Sunhe River. We also tested combinatory microbial agents, physical adsorption and multimedia bio-filter bed technologies independently on site to improve the ammonium nitrogen and total phosphorous removal rate of our technique, and the multimedia bio-filter bed is found to be most effective.

scholarly journals Aquatic insects, a tool for monitoring the health of riverine ecosystem, a case study of Killiyar, Thiruvananthapuram, Kerala, India

2020 ◽  
Author(s):  
Jyothy Lakshmi ◽  
Kurian Mathew Abraham ◽  
S Nandakumar ◽  
M. G. Samal Kumar
Keyword(s):  
Water Quality ◽  
Health Status ◽  
Environmental Protection Agency ◽  
Aquatic Insects ◽  
River System ◽  
Model Organisms ◽  
Biotic Index ◽  
Protection Agency ◽  
Lotic Ecosystems

Aquatic insects are used as model organisms for assessing the health status of lenthic or lotic ecosystems. Biomonitoring using entomological indicators is one of the widely accepted tools to analyze the impacts of sewages in aquatic environment. The present study was aimed to assess the health status of a semi urban river system, Killiyar using entomological indicators. Season wise sampling of aquatic insects was done at four selected segments according to the rapid bioassessment protocol recommended by Environmental Protection Agency. The present study could identify 29 families of aquatic insects for screening the levels of pollution in Killiyar. Family Biotic Index (FBI) showed that there was a remarkable variation in water quality along the river. Hilsenhoff’s family biotic index obtained for river origin was in the range 4.40 - 5.02 indicating excellent water quality. High value of family biotic index, least occurrence of intolerant groups and dominance of tolerant taxa in the midstream and downstream segments showed that increased contamination of water by various sources. Immediate attention is needed to cease the degradation of this precious ecosystem.      Keywords: Aquatic insects, Biomonitoring, Family Biotic Index, Killiyar, Water pollution

Surface Water Quality Assessment. Case Study: Târnava Mare River, Mediaș Town-Romania

2011 ◽  
Vol 4 (5) ◽  
pp. 70-72
Author(s):  
Cristina Roşu ◽  
◽  
Ioana Piştea ◽  
Carmen Roba ◽  
Mihaela Mihu ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Quality Assessment ◽  
Surface Water Quality ◽  
Water Quality Assessment
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