river water analysis Articles
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Willingness to pay for the urban river ecosystem restoration in Hangzhou and Nanjing, China
Continuing degradation of river ecosystems and environmental disruption are widespread in Chinese metropolitan areas. The study on the residents' preference for river ecosystem restoration is an essential part of assessing the environmental benefit and cost for policies implementation. A contingent valuation method is applied to estimate the public demand for urban river restoration in Hangzhou ...
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Development of a GIS-based decision support tool and assessment of Nile River water quality
The objective of this paper is to develop and present a GIS-based and software tool capable of data management, data visualisation, and data analysis. The developed software is proved to be a good tool in the initial assessment of the quality status of the Nile river water quality. In addition a Graphical User Interface (GUI) was fully designed and implemented to make the GIS tool very easy and ...
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Relationship between land use and water quality in a small watershed in South Korea
Recent research and monitoring undertaken by various institutions have emphasized measurements of river-water quality. Based on the results, government agencies have set guidelines to improve river-water quality management. However, the relationship between water quality and land use/land cover (LULC) has not been examined closely in South Korea to date. This study investigated this relationship ...
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Sensitivity analysis using a diffuse pollution hydrologic model to assess factors affecting pesticide concentrations in river water
We quantitatively evaluated the factors that affect the concentrations of rice-farming pesticides (an herbicide and a fungicide) in river water by a sensitivity analysis using a diffuse pollution hydrologic model. Pesticide degradation and adsorption in paddy soil affected concentrations of the herbicide pretilachlor but did not affect concentrations of the fungicide isoprothiolane. We attributed ...
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Parameter identification of river water quality models using a genetic algorithm
For solving the multi-parameter identification problem of a river water quality model, analytical methods for solving a river water quality model and traditional optimization algorithms are very difficult to implement. A new parameter identification model based on a genetic algorithm (GA) coupled with finite difference method (FDM) was constructed for the determination of hydraulic and water ...
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OVA5000 used to gather river quality data in Greece
Cogent Environmental, in collaboration with its Greek partner, has recently completed a successful installation of one of its online heavy metal analysers, the OVA5000, in a remote location in the Amvrakikos Kolpos region of Greece. Cogent Environmental’s capabilities Cogent Environmental Ltd specialises in the development of online systems for monitoring heavy meals, microbial ...
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Receiving water quality assessment: comparison between simplified and detailed integrated urban modelling approaches
Urban water quality management often requires use of numerical models allowing the evaluation of the cause–effect relationship between the input(s) (i.e. rainfall, pollutant concentrations on catchment surface and in sewer system) and the resulting water quality response. The conventional approach to the system (i.e. sewer system, wastewater treatment plant and receiving water body), considering ...
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Error analysis for river water quality prediction using back propagation modelling
The purpose of this research is to describe the errors of Back Propagation (BP) technique that could be applied in river water quality prediction. ANN was trained by using the upriver data to forecast the downriver quality in two approaches of long-distance forecasting and short-distance forecasting respectively. It showed that the predicted results from short-distance approach were more accurate ...
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Application of classification trees to determine biological and chemical indicators for river assessment: case study in the Chaguana watershed (Ecuador)
Benthic macroinvertebrates were sampled in the Chaguana river basin in SW Ecuador in March (wet season) and September (dry season) of 2005 and 2006. Aquatic insects dominated the macrobenthos, with Trichoptera, Diptera, Ephemeroptera, Hemiptera and Odonata being the orders with the highest diversity and Ephemeroptera and Diptera being most abundant. No systematic differences in richness and ...
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Assessment of the feasibility of floodwater utilization in North-East China
In order to alleviate the water supply–demand problem, a flood resource utilization strategy is proposed, called ‘Flood Utilization’. The strategy focuses on building large-scale water conservancy facilities and improving management measures. This paper presents the probability analysis of floodwater utilization in a confluence area, where a tributary joins a main river. Baicheng is used as ...
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Civil & Environmental Consultants, Inc. - Case Study
Water resource experts and leads at CEC, Matt Gramza and Steve Casey, sat down with CivilGEO’s engineering director, Chris Maeder, to share how CivilGEO’s software products have helped CEC amp up its game and achieve new levels of productivity with river analysis and storm water modeling work. Matt Gramza described some inefficiencies the firm routinely encountered when using ...
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Trend analysis of extreme runoff events in major river basins of Peninsular Malaysia
This study performed trend analysis of extreme runoff events (high flow and seven–day low flow) of four major river basins located in Peninsular Malaysia in Southeast Asia. Trend analysis using Spearman's rank test and standard normal homogeneity test using 25 years (1982–2006) of runoff data found no statistically significant trend in extreme events of Kelantan and Pahang basins. ...
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Influence of a dual monsoon system and two sources of groundwater recharge on Kofu basin alluvial fans, Japan
This study investigates the contribution ratios of different groundwater recharge sources and influence of a dual monsoon system in Kofu basin, central Japan, through the hydrogen and oxygen isotopic analysis of precipitation, river water, and groundwater. The study is focused on the area of the Kamanashigawa and Midaigawa alluvial fans, which are formed by two main rivers. Precipitation ...
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