scholarly journals Comparing the efficiency of hypoxia mitigation strategies in an urban, turbid tidal river via a coupled hydro-sedimentary–biogeochemical model

2019 ◽  
Vol 19 (11) ◽  
pp. 2551-2564
Author(s):  
Katixa Lajaunie-Salla ◽  
Aldo Sottolichio ◽  
Sabine Schmidt ◽  
Xavier Litrico ◽  
Guillaume Binet ◽  
...  
Keyword(s):  
Water Quality ◽  
River Flow ◽  
Water Discharge ◽  
Climatic Conditions ◽  
Mitigation Strategies ◽  
Tidal River ◽  
Biogeochemical Model ◽  
Management Actions ◽  
The City ◽  
D Model

Abstract. Coastal-water hypoxia is increasing globally due to global warming and urbanization, and the need to define management solutions to improve the water quality of coastal ecosystems has become important. The lower tidal Garonne River (TGR; southwestern France), characterized by the seasonal presence of a turbidity maximum zone (TMZ) and urban water discharge, is subject to episodic hypoxia events during low river flow periods in the summer. Future climatic conditions (higher temperature and summer droughts) and increasing urbanization could enhance hypoxia risks near the city of Bordeaux in the coming decades. A 3-D model of dissolved oxygen (DO) that couples hydrodynamics, sediment transport and biogeochemical processes was used to assess the efficiency of different management solutions for oxygenation of the TGR during summer low-discharge periods. We ran different scenarios of reductions in urban sewage overflows, displacement of urban discharges downstream from Bordeaux and/or temporary river flow support during the summer period. The model shows that each option mitigates hypoxia, but with variable efficiency over time and space. Sewage overflow reduction improves DO levels only locally near the city of Bordeaux. Downstream relocation of wastewater discharges allows for better oxygenation levels in the lower TGR. The support of low river flow limits the upstream TMZ propagation and dilutes the TGR water with well-oxygenated river water. Scenarios combining wastewater network management and low-water replenishment indicate an improvement in water quality over the entire TGR. These modelling outcomes constitute important tools for local water authorities to develop the most appropriate strategies to limit hypoxia in the TGR.Highlights. A 3-D model shows different efficiencies of management actions to limit hypoxia. Downstream relocation of wastewater discharge totally mitigates hypoxia. Sewage overflow reduction improves DO levels but only locally. Water replenishment improves DO in the upper estuary.

scholarly journals Comparing the efficiency of hypoxia mitigation strategies in an urban, turbid tidal river, using a coupled hydro sedimentary–biogeochemical model

2019 ◽  
Author(s):  
Katixa Lajaunie-Salla ◽  
Aldo Sottolichio ◽  
Sabine Schmidt ◽  
Xavier Litrico ◽  
Guillaume Binet ◽  
...  
Keyword(s):  
River Flow ◽  
Climatic Conditions ◽  
Mitigation Strategies ◽  
Tidal River ◽  
Biogeochemical Model ◽  
Urban Sewage ◽  
Oxygenation Level ◽  
Local Water ◽  
Temporary River ◽  
The City

Abstract. In view of future coastal hypoxia widespreading, it is essential to define management solutions to preserve a good quality of coastal ecosystems. The lower Tidal Garonne River (TGR, SW France), characterized by the seasonal presence of a turbidity maximum zone and urban water discharges, is subject to episodic hypoxia events during summer low river flow periods. The future climatic conditions (higher temperature; summer droughts) but also an increasing urbanization could enhance hypoxia risks near the city of Bordeaux in the next decades. A 3D model of dissolved oxygen (DO), which couples hydrodynamics, sediment transport and biogeochemical processes, is used to assess the efficiency of different management solutions on TGR oxygenation during summer low-discharge periods. We have runned different scenarios of reduction of urban sewage overflows, displacement of urban discharges downstream from Bordeaux, and/or temporary river flow support during summer period. The model shows that each option limits hypoxia, but with variable efficiency over time and space. Sewage overflow reduction improves DO levels only locally near the city of Bordeaux. Downstream relocation of wastewater discharges allows to reach better oxygenation level in the lower TGR. The support of low river flow limits the upstream TMZ propagation and dilutes TGR waters with well-oxygenated river waters. Scenarios combining wastewater network management and low water replenishment indicate an improvement in water quality over the entire TGR. These modelling outcomes constitute important tools for local water authorities to develop the most appropriate strategies to limit hypoxia in TGR.

scholarly journals EVALUATION OF POSSIBLE CHANGES IN THE RIVER LINE OF THE OKA BASIN FOR THE COMING PERIOD OF THE FIRST HALF OF THE XXI CENTURY

2020 ◽  
Vol 1 (5) ◽  
pp. 71-75
Author(s):  
G. Kh. Ismaiylov ◽  
◽  
N.V. Muraschenkova ◽  
Keyword(s):  
River Basin ◽  
21St Century ◽  
River Runoff ◽  
River Flow ◽  
Climatic Conditions ◽  
Global Changes ◽  
The Future ◽  
Seasonal Runoff ◽  
The City

A retrospective analysis and assessment of long-term changes in the annual and seasonal runoff of the Oka River basin over a long 131-year observation period (1881 / 1882–2011/2012) was performed. The changes in the annual distribution of the Oka river runoff over the seasons of the year (spring flood, summer-autumn and winter low water) from its annual value for the selected time periods (before and after 1976/1977) are considered. It has been noted that over the past decades, river runoff has been formed in new climatic conditions associated with global changes and, as a result, regional climate. The assessment of possible changes in the annual and seasonal runoff of the Oka River basin (to the final alignment – the city of Kaluga, with a basin area of 54,900 km2 ) in the first half of the 21st century is carried out. In assessing changes in the river flow of the Oka basin for the future period, the method of trends (trends) is used, based on the identification of cycles in fluctuations in hydrological characteristics and unidirectional trends (trends) inherent in individual phases (ups and downs) of these cycles, as well as to the establishment of functional (correlation) relationships between environmental factors (climatic, anthropogenic) and the nature of the response (river flow). In this case, the trend model serves as an alternative to the homogeneity hypothesis of long-term fluctuations in river flow. The change in the future values of the river flow of the Oka basin was estimated using averaged data of 30-year periods of time characterized by relative stationarity of climatic and hydrological conditions. The dynamics of the average 30-year values of the annual runoff in the upper reaches of the Oka River (the closure target is the city of Kaluga for the period 1881/1882–2011/2012) is considered. Possible forecasted mean annual values of the annual flow of the Oka River for the first half of the 21st century are obtained

scholarly journals Historical Water Supply System of the City of Brno—Social-Environmental Consequences

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3550
Author(s):  
David Honek ◽  
Milena Forejtníková ◽  
Miloš Rozkošný ◽  
Aleš Vyskočil
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Water Supply ◽  
Industrial Development ◽  
River Flow ◽  
Water Quality Monitoring ◽  
Supply System ◽  
Water Supply System ◽  
River Catchment ◽  
The City

This paper provides a detailed look into the historical development of the water supply system of a big industrial city and its impact on the river environment and needs of the wastewater treatment system. The city of Brno, Czech Republic, was chosen for this study because it has a long history in the field of water supply, and the city has changed rapidly over the last 200 years. The city’s development necessitated an adaptation of drinking water sources, most significantly the use of the Březová nad Svitavou facility, which resulted in a change of condition of the Svitava River. The notable decrease in river flow, aided by industrial development of settlements within the Svitava River catchment between 1850 and 1950, strongly contributed to the spread of river pollution. However, the construction of wastewater treatment plants during recent decades led to a restoration of river quality and, consequently, of the entire environment of the Svitava River catchment. This paper also presents a view on activities connected with the long term surface water quality monitoring and improvement with regard to water quality conditions in spring areas and the river network influenced by the water supply system.

scholarly journals Evaluasi lanskap koridor Sungai Sekadau di Desa Mungguk, Sekadau, Kalimantan Barat

2021 ◽  
pp. 144
Author(s):  
Crismania Apriati Selly ◽  
Rizki Alfian ◽  
Debora Budiyono
Keyword(s):  
Water Quality ◽  
Spatial Analysis ◽  
Urban Growth ◽  
Natural Water ◽  
Swot Analysis ◽  
River Flow ◽  
Community Based ◽  
The Government ◽  
The City ◽  
River Corridor

A river is a natural water flow that flows from upstream to downstream. Sekadau River is located in the middle of Sekadau city to be precise in Mungguk Village, the center of urban growth. The existence of a river flow that crossed the city made many changes occurring in the Sekadau River corridor, this was due to the large number of settlements in the riverbank area which resulted in a decrease in river water quality. The purposes of this study were to analyze landscape conditions, prepare recommendations based on SWOT analysis and spatial analysis. The method used in this research was descriptive qualitative with analysis methods, namely SWOT analysis and spatial analysis. The result of this study, based on a SWOT analysis, showed that there was community-based management in coordination with the government, the community and the private sector. Spatial analysis showed that the land cover of the Sekadau River was still dominated by vegetation along the riverbanks, but the problem was in the estuary which had become a settlement. At the bottom of the river, there was a stepping stone corridor, in the middle there was a linear corridor and at the top of the river there was a linear corridor.

scholarly journals Modeling the Responses of Dissolved Oxygen and Nitrate Concentrations due to Land Use and Land Cover Change Scenarios in a Large Subtropical Reservoir

2021 ◽  
Author(s):  
Carolina Barbosa ◽  
Maria do Carmo Calijuri ◽  
Phelipe Anjinho ◽  
André dos Santos
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Land Cover ◽  
Dissolved Oxygen ◽  
Biogeochemical Model ◽  
Modeling Framework ◽  
Large Reservoir ◽  
Management Actions ◽  
Nitrate Concentrations ◽  
The Impact

Itupararanga reservoir is a large reservoir built in the Southeast of Brazil to support multiple uses, mainly hydropower generation and drinking water supply for almost 1 million people. We applied a process-based biogeochemical model and a distributed basin load model to assess the responses of dissolved oxygen and nitrate concentrations in the Itupararanga reservoir based on three land use and land cover (LULC) scenarios. The proposed LULC management actions resulted in a set of diverse ecosystem responses of the Itupararanga reservoir and the biogeochemical model highlighted the impact of allochthonous nutrient loads on reservoir water quality conditions, as well as the overall low biogeochemical turnover in the Itupararanga reservoir. The proposed modeling framework is a coupling of open science tools, which can be used to estimate future changes in the water quality of standing freshwater bodies due to likely changes in the land use and land cover in watersheds.

scholarly journals Variability of the Warta River water discharge in the city of Poznań as influenced by the Jeziorsko reservoir / Zmienność przepływów rzeki Warty w Poznaniu w aspekcie eksploatacji zbiornika Jeziorsko

2015 ◽  
Vol 41 (3) ◽  
pp. 53-59 ◽  
Author(s):  
Antoni T. Miler
Keyword(s):  
Water Quality ◽  
Catchment Area ◽  
Water Discharge ◽  
Flood Wave ◽  
Short Term ◽  
Data Set ◽  
Gradual Improvement ◽  
Storage Volume ◽  
The World ◽  
The City

Abstract The data set of the Warta discharges in Poznań (Poland) is one of the largest in the world as the daily observations of river stages have been conducted without interruptions since January, 1st, 1822. The Poznań measurement profile is situated in the 243.6 km and closes the catchment area of approximately 25 thousand square kilometers. The data used as the input in the paper were daily values of the Warta discharges in Poznań in the years 1822-2012. The climate in Poznań, a city situated in the centre of the Wielkopolska (Greater Poland) region, is relatively stable (Miler et al. 2005). Also the Warta River runoff shows considerable stability, especially in terms of mean annual values. Short-term trends are random in character. It was found that the Jeziorsko reservoir (total storage volume of 203 000 000 m3, officially put to use on September, 9th, 1987) significantly reduced daily variability of the flows and reduced peak discharge of the flood wave in the summer of 1997 on the Warta River at Poznań. The calculated periodogram for mean annual discharges of the Warta River in Poznań shows that there are main periodicities of ca. 10 year lengths. The research of the Provincial Inspectorate for Environmental Protection (WIOŚ) in Poznań shows a gradual improvement of water quality in the Warta River in Poznań.

scholarly journals KUALITAS AIR SUNGAI SAGO KECAMATAN SENAPELAN KOTA PEKANBARU TAHUN 2016

2020 ◽  
Vol 8 (2) ◽  
pp. 138-147
Author(s):  
Jufenti Ade Fitri
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Design Research ◽  
River Flow ◽  
Flow Area ◽  
Common Purpose ◽  
Residential Market ◽  
The City

River sago that is a tributary siak which has received pressures environment a result of of land use and activities people of residential , market , office , the hospital and industry .Pressure that environment indicated has caused a decline in the quality of the waters of the sago. A common purpose research is to know the quality of the waters of the sago kecamatan senapelan the city of pekanbaru 2016 and factors that affects the quality of the waters of the sago kecamatan senapelan the city of pekanbaru. This research is descriptive quantitative with the design research non standard, to know the quality of the waters of the based on an indicator water quality. Samples to be taken from 3 points, station I in the upstream location jl. Cut Nyak Dien gg. Jambu Air, station II in central location jl. Juanda, station III downstream jl. Pelita Pantai The result of this research that is explained that the quality of the waters of the sago in station I in the upstream is category and he medium, with the Water Quality Index in the morning that is 66.09 and afternoon 65.33.Station II in the middle is category and he medium with the Water Quality Index in the morning that is 61.05 and afternoon 56.34. Station III downstream is of medium category medium with the water quality index in the morning that is 65.45 and afternoon 57.88. Conclusion in this research is activity the community a watershed Sago will affect the quality of the waters of the Sago. Advice in this research was significance social expected the formulation of local regulations the city of Pekanbaru about absorption wells. Significance scientific research a kind of to be done sampling repeated based on different time.   Keywords : Water Quality Index (WQI), River, River Flow Area (DAS)

Seasonal and longitudinal patterns of plastic pollution in a subtropical urban river

2020 ◽  
Author(s):  
Charlotte Haberstroh ◽  
Mauricio Arias
Keyword(s):  
Land Use ◽  
Management Practices ◽  
River Flow ◽  
River Mouth ◽  
Climatic Conditions ◽  
Dry Season ◽  
Plastic Pollution ◽  
Sampling Campaign ◽  
River Hydrology ◽  
The City

<p>Plastic contamination in rivers quickly changes over time and space, driven by factors such as land use, urbanization and population density, climatic conditions and river hydrology. Understanding the patterns and mechanisms behind these fluctuations is of major importance to estimate and evaluate plastic loads and to forward management strategies and policies. During a 18-month sampling campaign (May 2018 to October 2019) in the Hillsborough River Tampa (USA), we studied how seasonality and urban pollution affected plastic loads transported through the river. We sampled monthly at three sampling sites, strategically located to assess the release of plastic through urban runoff from Tampa, covering two wet seasons and one dry season. At each site, we conducted stationary sampling with a 500-µm mesh neuston net at five different positions through the width and depth of the river. Using an Acoustic Doppler Current Profiler, we also collected comprehensive data on flow characteristics and accurately estimated river discharge during sampling events. All samples were processed in the laboratory with state-of-the-art methods to separate plastic particles from water samples. Plastic particles were classified by size categories and a subset was identified using Raman spectroscopy. Results of this study shows a strong correlation between plastic loads and rainfall seasonality. For instance, mean concentrations close to the mouth of the river varied from less than 1 count/m<sup>3</sup> during the dry season (March-May) to up to 9 counts/m<sup>3</sup> during wet months (September). Furthermore, there was a substantial increase in loads as the river passed through the city, mostly peaking at the farthest downstream site close to the river mouth; while median concentrations at the site upstream from the city were 0.21 counts/m<sup>3 </sup>(range of 0-1.68), median concentrations at the station close to the river mouth (in Downtown Tampa) were 1.16 counts/m<sup>3 </sup>(range of 0.14-21.61 counts/m<sup>3</sup>). During some months, however, loads were higher at the second site, located in the middle of a residential and commercial district. Differences in plastic loads along the river were explained by river flow accumulation and land use/land cover intensity, though small differences in concentrations between the middle site and the furthest downstream can be explained by differences in stormwater management practices between these two contrasting socioeconomic areas. This study generated a unique and comprehensive dataset on plastic loads and river hydrology on a watershed scale to evaluate drivers of plastic pollution and rivers as their pathway, providing a base for the development of management plans in urban rivers and solution strategies for plastic pollution in similar subtropical watersheds.</p>

scholarly journals Contaminant Removal and Precious Metal Recovery by Lateral Channel Filtration in Mining-Impacted Alluvial Floodplains

2020 ◽  
Vol 2 ◽  
Author(s):  
William P. Johnson ◽  
Eddy Pazmiño ◽  
Logan Frederick ◽  
Cesar Ron ◽  
Andrea Chica ◽  
...  
Keyword(s):  
Water Quality ◽  
River Flow ◽  
Developing Economies ◽  
Economic Incentive ◽  
Mitigation Strategies ◽  
Small Scale ◽  
Mining Operations ◽  
Lateral Channel ◽  
Particulate Contaminants ◽  
Alluvial Floodplains

Water quality impacts from artisanal and small-scale alluvial (placer) gold mining operations occur in developing economies across several continents including Asia, Africa, and South America. They often occur in remote and/or resource-poor settings in which mitigation strategies must contend with extreme seasonal variation in river flow as well as the economic incentive to periodically churn (mine) alluvial floodplains without riparian restoration. A novel strategy addressing these constraints is herein explored which employs the alluvial floodplain for filtration-driven removal of particulate contaminants and gold from streams. This process of lateral channel filtration is explored in the Rio Nambija of southern Ecuador, in terms of success in achieving the hydraulic objective of passively driven lateral flow, and the corresponding removal of particulate contaminants (e.g., total mercury, lead, iron, and manganese) by filtration. Accumulation of gold was examined to evaluate whether incorporation of this proposed practice in alluvial (placer) mining can reduce particle-bound contaminants in streams and simultaneously increase economic benefit. Excavation of channels lateral to mining-impacted streams was shown to achieve the hydraulic, water quality, and economic (gold accumulation) objectives. The modest flow capture for any given lateral segment, along with the months-long timescale associated with economic gold accumulation and clogging by suspended solids, dictate a “cultivation” process whereby multiple lateral segments are worked annually.

scholarly journals Alteration of Runoff on the Territory of Moscow as a Result of Landscape Transformations

2014 ◽  
pp. 57-68
Author(s):  
Keyword(s):  
Waste Water ◽  
Surface Runoff ◽  
River Flow ◽  
Water Discharge ◽  
Climatic Conditions ◽  
Landscape Dynamics ◽  
Runoff Water ◽  
The Past ◽  
Landscape Transformations ◽  
Water Work

This paper attempts to assess the runoff alterations on the territory of contemporary Moscow over the past 150 years under the influence of landscape transformations (without taking into account water work facilities transformations, diversions of runoff, water intake and waste water discharge) in the case of average many-year climatic conditions. The landscape dynamics has been tracked. The surface runoff alterations have been reflected. Runoff alterations of infiltration origin and total river flow alterations have been assessed. Particular attention has been paid to the urbanized areas’hydrological role.

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