scholarly journals Influences of Large-Scale Flood on Water Quality of Tokyo Bay

2009 ◽  
Vol 65 (1) ◽  
pp. 1016-1020
Author(s):  
Yasuo NIHEI ◽  
Kentaro TAKIOKA ◽  
Ayako SAKAI ◽  
Kyosuke SHIGETA
Keyword(s):  
Water Quality ◽  
Large Scale ◽  
Tokyo Bay

scholarly journals Influence of EU policy on agricultural nutrient losses and the state of receiving surface waters in Finland

2008 ◽  
Vol 16 (4) ◽  
pp. 282 ◽  
Author(s):  
P. EKHOLM ◽  
K. GRANLUND ◽  
P. KAUPPILA
Keyword(s):  
Water Quality ◽  
Large Scale ◽  
Nutrient Loading ◽  
Nutrient Losses ◽  
Agricultural Catchments ◽  
Receiving Waters ◽  
Environmental Measures ◽  
Current Loading ◽  
Regional Specialisation

In Finland, the first large-scale efforts to control nutrient loading from agriculture got under way with the introduction of the EU Agri-Environmental Program in 1995. We examined whether these efforts have decreased agricultural nutrient losses and improved the quality of receiving waters. To do so we used monitoring data on fluxes of nutrients and total suspended solids in agricultural catchments in 1990–2004 and on the water quality of agriculturally loaded rivers, lakes and estuaries in 1990–2005. No clear reduction in loading or improvement in water quality was detected. Hydrological fluctuations do not seem to have eclipsed the effects of the measures taken, since there was no systematic pattern in runoff in the period studied. The apparent inefficiency of the measures taken may be due to the large nutrient reserves of the soil, which slowed down nutrient reductions within the period studied. Simultaneous changes in agricultural production (e.g. regional specialisation) and in climate may also have counteracted the effects of agri-environmental measures. The actions to reduce agricultural loading might have been more successful had they focused specifically on the areas and actions that contribute most to the current loading.;

Assessment on the Water Quality Influenced by Large-Scale Controlled Planting of Water Hyacinth in the Dianchi Lake

2013 ◽  
Vol 726-731 ◽  
pp. 1782-1785 ◽  
Author(s):  
Xia Zhang ◽  
Zong Shou Cai ◽  
Li Hong Chen ◽  
Jian Wen Ruan
Keyword(s):  
Water Quality ◽  
Ecological Restoration ◽  
Water Hyacinth ◽  
Large Scale ◽  
Present Situation ◽  
Dianchi Lake ◽  
The Future ◽  
Before And After ◽  
Ecological Treatment

Large-scale controlled planting of water hyacinth has become one of the most important measures of Dianchi Lake’s treatment in the “12th Five-Year Plan”. This paper firstly introduced the present situation of large-scale controlled planting of water hyacinth in Dianchi Lake. The water quality of Caohai and Waihai of Dianchi Lake were compared before and after the project of planting water hyacinth. This paper concluded that the effects of large-scale controlled planting of water hyacinth on the ecological restoration of Caohai lake were outstanding. The area of controlled planting could be spread among other water areas of Dianchi lake where is suitable for the growth of water hyacinth in the future, and water hyacinth will pay a greater role in the ecological treatment of Dianchi Lake.

scholarly journals An Assessment of Drinking Water Quality in Cauvery Delta Region and Palar Region, Tamil Nadu

2017 ◽  
Vol 3 (12) ◽  
pp. 238
Author(s):  
R. Sophia Porchelvi ◽  
P. Selvavathi
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
River Basin ◽  
Tamil Nadu ◽  
Large Scale ◽  
Anthropogenic Activities ◽  
Small Scale ◽  
Drinking Purposes ◽  
Cauvery Delta

Delta regions of the Cauvery River basin are one of the significant areas of rice production in India. In spite of large-scale utilization of the river basin for irrigation and drinking purposes, the lack of appropriate water management has seemingly deteriorated the water quality due to increasing anthropogenic activities. Vellore is the second most populous district of Tamil Nadu in India where the Palar River flowing towards east for about 295 Km. Vellore is surrounded by many leather tanneries and small scale dying industries and their effluents are discharged into the Palar river causing impact on the quality of the underground water. To assess the extent of deterioration, physicochemical characteristics of surface water were analyzed select regions of Cauvery Delta River basin and Palar region, Tamil Nadu, during March 2016 to May 2016. This study aimed to examine quality of drinking groundwater. The results represented whether the water was suitable or unsuitable for drinking purposes in this area. It was also observed that some areas like Tiruvarur, Needamangalam, Kamalapuram, Arcot, Soraiyur, Ranipet had low quality drinking water. It is suggested to take some necessary measures for supplying desirable water to the people living in these areas.

The Influence of Large Scale Phosphate Mining on the Water Quality of the Huangbaihe River Basin in China: Dominant Pollutants and Spatial Distributions

2019 ◽  
Vol 38 (2) ◽  
pp. 366-377 ◽  
Author(s):  
Gebrehiwet Legese Reta ◽  
Xiaohua Dong ◽  
Bob Su ◽  
Xiaonong Hu ◽  
Huijuan Bo ◽  
...  
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Large Scale ◽  
Spatial Distributions ◽  
Phosphate Mining

Widespread underestimation of the danger of groundwater contamination by shortcuts into aquifers

2020 ◽  
Author(s):  
Andreas Hartmann ◽  
The karst vulnerablity research consortium
Keyword(s):  
Water Quality ◽  
Groundwater Contamination ◽  
Large Scale ◽  
Scale Model ◽  
World Population ◽  
Continental Scale ◽  
Scale Modelling ◽  
Agricultural Pollutants ◽  
First Time

<p>Groundwater pollution threatens human and ecosystem health in many areas around the globe. Shortcuts to the groundwater through enlarged cracks and fissures, often referred to as concentrated recharge, are known to transmit short-lived pollutants into carbonate aquifers endangering water quality of around a quarter of the world population. However, the large-scale impact of concentrated recharge on water quality remains poorly understood. Here we apply a continental-scale model to quantify for the first time the danger of groundwater contamination by degradable pollutants through concentrated recharge in carbonate rock regions. We show that concentrated recharge is the primary reason for the rapid transport of contaminants to the groundwater, increasing the percentage of non-degraded pollutants from <1% in areas without concentrated recharge to around 20-50% in areas where concentrated recharge is present. Our findings are most pronounced in the Mediterranean region where agricultural pollutants in groundwater recharge like Glyphosate can exceed allowed concentrations by up to 19 times. Our results imply that in regions where shortcuts to the groundwater exist, continuing industrial agricultural productivity to optimize food production may result in a widespread reduction of available drinking water and harm ecosystem services more intense than presently available large-scale modelling concepts suggest.</p>

Biosorption of Heavy Metals

2018 ◽  
pp. 270-281
Author(s):  
Neelesh Babu ◽  
Vinay Mohan Pathak ◽  
Akash ◽  
Navneet
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Cell Wall ◽  
Industrial Waste ◽  
Large Scale ◽  
Water Bodies ◽  
Raw Material ◽  
Scale Production ◽  
Large Scale Production

Large-scale production of commodities for mankind by industries did huge damage to the environment. Industrial waste contains lots of toxic materials including heavy metals were drained to water bodies like river, lakes, ponds, etc. These effluents drastically ruin water quality as well as the soil fertility. Type of industry and its raw material decides quantity and quality of the emerged wastes including both biodegradable as well as non-biodegradable. Among non-biodegradable wastes, copper, chromium, nickel, cadmium, etc. are widespread contaminants of soil, water, and these are most common heavy metals. Several heavy metals such as cadmium, mercury, and lead are highly poisonous and fatal to human as well as animals. Several plants as well as microbes respond to heavy metals by diverse biological processes like biosorption to their cell wall and entrapment in their capsule, oxidation and reduction, precipitation, complexation, etc. These responses may help significantly in the remediation of heavy metals from the contaminated sites.

Accounting for discharge simulation performances and observation quality for modelling sediment at global scale

2020 ◽  
Author(s):  
Alban de Lavenne ◽  
Alena Bartosova ◽  
Johan Strömqvist ◽  
Berit Arheimer
Keyword(s):  
Water Quality ◽  
Time Series ◽  
Large Scale ◽  
Global Scale ◽  
Limiting Factor ◽  
Simulation Performance ◽  
Sediment Loads ◽  
Discharge Simulation ◽  
Monitoring Stations

<p>Water quality modelling is very often constrained beforehand by the performance of discharge modelling. When the model is set up at global scale, this discharge performance usually greatly varies in space and can therefore be a limiting factor in many regions around the globe. Besides discharge performances, the quality of the observations themselves can also be highly heterogeneous in space and among datasets. Modeller then has to find a compromise between being restrictive on the quality of his dataset or having a good spatio-temporal representativeness of the various hydrological conditions at global scale. This often relies on subjective thresholds.</p> <p>This work proposed a more objective calibration strategy that aims to consider both aspects explicitly: observation quality and model performance on discharge. It leads to the construction of two scores that are assigned to each water quality station quantifying their reliability for model calibration and evaluation. The average of those two scores is then used as a weight in the objective function to emphasise the training on the most reliable stations.</p> <p>The strategy is implemented for sediment modelling using the WW-HYPE model (Arheimer et al., 2019) at global scale. The score on discharge simulation performance is based on the regionalisation of the Nash-Sutcliffe Efficiency that is spatially interpolated at every sediment monitoring stations using inverse Ghosh distance weighting (de Lavenne et al., 2016). The score on the observation quality is based on the location of the station with respect to the catchment outlet and on the amount of data. A multi-objective calibration is performed to optimise parameters on two global databases, one on long terms sediment loads (730 stations) and one on sediment concentrations time series (1440 stations). The sensitivity of the model to this calibration strategy is analysed according to model performances and model outputs, such as sediment loads at global scale, in order to discuss the importance of considering this heterogeneity of the reliability of monitoring stations.</p> <p>References</p> <p>Arheimer, B., Pimentel, R., Isberg, K., Crochemore, L., Andersson, J. C. M., Hasan, A., and Pineda, L. (2019), Global catchment modelling using World-Wide HYPE (WWH), open data and stepwise parameter estimation, Hydrol. Earth Syst. Sci. Discuss., doi:10.5194/hess-2019-111.</p> <p>de Lavenne, A., J. O. Skøien, C. Cudennec, F. Curie, and F. Moatar (2016), Transferring measured discharge time series: Large-scale comparison of Top-kriging to geomorphology-based inverse modeling, Water Resour. Res., 52, 5555–5576, doi:10.1002/2016WR018716.</p>

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