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  • Review Article
  • Published: 12 September 2023

Global river water quality under climate change and hydroclimatic extremes

  • Michelle T. H. van Vliet   ORCID: orcid.org/0000-0002-2597-8422 1 ,
  • Josefin Thorslund   ORCID: orcid.org/0000-0001-6111-4819 1 , 2 ,
  • Maryna Strokal   ORCID: orcid.org/0000-0002-8063-7743 3 ,
  • Nynke Hofstra   ORCID: orcid.org/0000-0002-0409-5145 3 ,
  • Martina Flörke   ORCID: orcid.org/0000-0003-2943-5289 4 ,
  • Heloisa Ehalt Macedo   ORCID: orcid.org/0000-0002-3430-1480 5 ,
  • Albert Nkwasa   ORCID: orcid.org/0000-0002-8685-8854 6 , 7 ,
  • Ting Tang 8 ,
  • Sujay S. Kaushal 9 ,
  • Rohini Kumar   ORCID: orcid.org/0000-0002-4396-2037 10 ,
  • Ann van Griensven 6 ,
  • Lex Bouwman 11 , 12 &
  • Luke M. Mosley 13  

Nature Reviews Earth & Environment volume  4 ,  pages 687–702 ( 2023 ) Cite this article

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  • Environmental chemistry

Climate change and extreme weather events (such as droughts, heatwaves, rainstorms and floods) pose serious challenges for water management, in terms of both water resources availability and water quality. However, the responses and mechanisms of river water quality under more frequent and intense hydroclimatic extremes are not well understood. In this Review, we assess the impacts of hydroclimatic extremes and multidecadal climate change on a wide range of water quality constituents to identify the key responses and driving mechanisms. Comparison of 965 case studies indicates that river water quality generally deteriorates under droughts and heatwaves (68% of compiled cases), rainstorms and floods (51%) and under long-term climate change (56%). Also improvements or mixed responses are reported owing to counteracting mechanisms, for example, increased pollutant mobilization versus dilution during flood events. River water quality responses under multidecadal climate change are driven by hydrological alterations, rises in water and soil temperatures and interactions among hydroclimatic, land use and human drivers. These complex interactions synergistically influence the sources, transport and transformation of all water quality constituents. Future research must target tools, techniques and models that support the design of robust water quality management strategies, in a world that is facing more frequent and severe hydroclimatic extremes.

River water quality is generally deteriorating under droughts and heatwaves (68% of case studies), rainstorms and floods (51%) and multidecadal historical and future climate change (56%), although improvements and mixed responses are also reported.

Droughts and heatwaves result in lower dissolved oxygen and increased river temperature, algae, salinity and concentrations of pollutants (such as pharmaceuticals) from point sources owing to lower dilution. By contrast, low flow during these events leads to reduced pollutant transport from agricultural and urban surface runoff, contributing to lower concentrations.

Rainstorms and floods generally increase the mobilization of plastics, suspended solids, absorbed metals, nutrients and other pollutants from agricultural and urban runoff, although high flow can dilute concentrations for salinity and other dissolved pollutants. The sequence of extreme events (such as droughts followed by floods) also impacts the magnitude and drivers of river water quality responses.

Multidecadal climate change is causing water temperatures and algae to generally increase, partly causing a general decrease in dissolved oxygen concentrations. Nutrient and pharmaceutical concentrations are mostly increasing under climate change, whereas biochemical oxygen demand, salinity, suspended sediment, metals and microorganisms show a mixture of increasing and decreasing trends.

The main driving mechanisms for multidecadal water quality changes in response to climate change include hydrological alterations, rises in water and soil temperatures and interactions of hydroclimatic drivers with land use. These impacts are compounded with other human-induced drivers.

Our findings stress the need to improve understanding of the complex hydroclimatic–geographic–human driver feedbacks; water quality constituent fate, transport, interactions and thresholds; and to develop technologies and water quality frameworks that support the design of robust water quality management strategies under increasing hydroclimatic extremes.

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Data availability.

Details on the literature review and reports for each water quality constituent (group) are given in Supplementary Notes 1–12 . The Supplementary Data file includes a spreadsheet with collected meta-data of all literature case studies in the compilation. River water quality monitoring data for Fig.  3 were retrieved from the USGS Water-Quality Data for the Nation database ( https://waterdata.usgs.gov/nwis/qw ) and Rijkswaterstaat Dutch Ministry of Infrastructure and Water database ( https://waterinfo.rws.nl/#!/nav/expert/ ).

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Acknowledgements

The authors kindly acknowledge J. Banken of Wageningen University and K. Schweden of Ruhr University Bochum for their assistance with collecting water quality literature. The authors thank M. Stoete of Utrecht University for her assistance in designing some figures. The authors also acknowledge the World Water Quality Alliance (WWQA), ISI-MIP and EU COST-Action PROCLIAS initiatives. M.T.H.v.V. was financially supported by the European Union (ERC Starting Grant, B-WEX, Project 101039426) and Netherlands Scientific Organisation (NWO) by a VIDI grant (VI.Vidi.193.019). M.S. was supported by the Netherlands Scientific Organisation (NWO) by a VENI grant (016.Veni.198.001). J.T. was financially supported by The Swedish Research Council Formas (Project No. 2018-00812).

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M.T.H.v.V. designed and led the study and manuscript effort. J.T. contributed to the design of the literature review. J.T., M.S., N.H., M.F., H.E.M., A.N., T.T. and M.T.H.v.V. collected literature for the analyses and wrote reports for specific water quality constituents for the supplementary information. L.M.M., S.S.K. and R.K. contributed to the writing of specific sections. All authors contributed to the writing of the manuscript.

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van Vliet, M.T.H., Thorslund, J., Strokal, M. et al. Global river water quality under climate change and hydroclimatic extremes. Nat Rev Earth Environ 4 , 687–702 (2023). https://doi.org/10.1038/s43017-023-00472-3

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a case study of pollution in river arkavathy

Estimating turbidity concentrations in highly dynamic rivers using Sentinel-2 imagery in Google Earth Engine: Case study of the Godavari River, India

  • Research Article
  • Published: 01 May 2024

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a case study of pollution in river arkavathy

  • Meena Kumari Kolli 1 , 2 &
  • Pennan Chinnasamy   ORCID: orcid.org/0000-0002-3184-2134 1 , 2 , 3 , 4 , 5 , 6  

Turbidity is an essential biogeochemical parameter for water quality management because it shapes the physical landscape and regulates ecological systems. It varies spatially and temporally across large water bodies, but monitoring based on point-source field observations remains a difficult task in developing countries due to the need for logistics and costs. In this study, we present a novel semi-analytical approach for estimating turbidity from remote sensing reflectance \(({R}_{{\text{rs}}})\) in moderate to highly turbid waters in the lower part of the Godavari River (i.e., locations near Rajahmundry). The proposed method includes two sub-algorithms—Normalized Difference Turbidity Index (NDTI) and semi-empirical single-band turbidity ( \({T}_{{\text{s}}}\) ) algorithm—to retrieve spectral reflectance information corresponding to the study locations for turbidity modeling. Sentinel-2 Multi-Spectral Imager data have been used to quantify the turbidity in the Google Earth Engine (GEE) platform. The correlation analysis was observed between spectral reflectance values and in situ turbidity data using cubic polynomial regression equations. The results indicated that the \({T}_{{\text{s}}}\) , which uses the only red-edge wavelength, identified turbidity as the most accurate across all locations (highest R 2  = 0.91, lowest RMSE = 0.003), followed by NDTI (highest R 2  = 0.85, lowest RMSE = 0.05), respectively. The remote sensing data application provides a better way to monitor turbidity at large spatio-temporal scales in attaining the water quality standards of the Godavari River.

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a case study of pollution in river arkavathy

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Sources of all the data have been described properly. Derived data supporting the findings of this study are available based on the request to the corresponding author.

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Acknowledgements

This work is partially supported by the Institute Post-doctoral Fellowship at IIT Bombay. The authors would like to thank the European Space Agency for free access to the Sentinel-2 data. We are grateful to Google for the GEE platform, which provided an efficient and powerful computing platform.

This research has been supported by the Water Productivity Improvement in Practice (Water-PIP) project, which is funded by the IHE Delft Water and Development Partnership Programme (WDPP) under the programmatic cooperation between the Directorate General for International Cooperation (DGIS) of the Ministry of Foreign Affairs of the Netherlands and IHE Delft (ID: DGIS Activity DME0121369).

Award Number: 111349 (WATERPIP project) | Recipient: Pennan Chinnasamy, Ph.D.

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Rural Data Research and Analysis Lab (RuDRA), IIT Bombay, Mumbai, India

Interdisciplinary Programme in Climate Studies (IDPCS), IIT Bombay, Mumbai, India

Pennan Chinnasamy

Centre for Machine Intelligence and Data Science(C‑MInDS), IIT Bombay, Mumbai, India

Ashank Desai Centre for Policy Studies, IIT Bombay, Mumbai, India

Nebraska Water Center, University of Nebraska, Lincoln, NE, USA

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Ideation, discussion, data sources identification, draft preparation, editing, and finalization—Prof. Pennan Chinnasamy.

Data collection, GIS, analysis, draft preparation, writing, and maps—Meena Kumari Kolli.

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Kolli, M.K., Chinnasamy, P. Estimating turbidity concentrations in highly dynamic rivers using Sentinel-2 imagery in Google Earth Engine: Case study of the Godavari River, India. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33344-4

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DOI : https://doi.org/10.1007/s11356-024-33344-4

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Water management in Arkavathy basin: A situation analysis

Profile image of Sharachchandra (Sharad) Lele

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West Bengal (88,752 km²) is the only Indian state that stretches from the Himalaya to the Bay of Bengal. It can be divided into nine physiographic provinces of which the Himalayas, the western plateaus, the northern and western alluvial fans and the Ganga delta are most important. The development of the river system of the state was largely governed by tectonic evolution of the eastern Himalaya and western edges of the Bengal basin. The characteristics of the rivers as well as a number of aspects of water resources of the state can be linked to its physiographic regions. The principal issues associated with water in West Bengal include river degeneration, channel shifting, flood, urban waterlogging, drought, pollution, groundwater depletion and inland navigation. The management of water is practised by river impoundment projects in various scales and by drainage schemes. It is estimated that the western and eastern parts of the state are most water stressed regions due to climatic and human factors, respectively. The solution to many of the water-related problems of West Bengal, progressive or cyclic, can be addressed by putting emphasis on participatory management besides government intervention.

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Water planning decisions are only as good as our ability to explain historical trends and make reasonable predictions of future water availability. But predicting water availability can be a challenge in rapidly growing regions, where human modifications of land and waterscapes are changing the hydrologic system. Yet, many regions of the world lack the long-term hydrologic monitoring records needed to understand past changes and predict future trends. We investigated this “predictions under change” problem in the data-scarce Thippagondanahalli (TG Halli) catchment of the Arkavathy sub-basin in southern India. Inflows into TG Halli reservoir have declined sharply since the 1970s. The causes of the drying are poorly understood, resulting in misdirected or counter-productive management responses. Five plausible hypotheses that could explain the decline were tested using data from field surveys and secondary sources: (1) changes in rainfall amount, seasonality and intensity; (2) increases in temperature; (3) groundwater extraction; (4) expansion of eucalyptus plantations; and (5) fragmentation of the river channel. Our results suggest that groundwater pumping, expansion of eucalyptus plantations and, to a lesser extent, channel fragmentation are much more likely to have caused the decline in surface flows in the TG Halli catchment than changing climate. The multiple-hypothesis approach presents a systematic way to quantify the relative contributions of proximate anthropogenic and climate drivers to hydrological change. The approach not only makes a meaningful contribution to the policy debate but also helps prioritize and design future research. The approach is a first step to conducting use-inspired socio-hydrologic research in a watershed.

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  1. Case Study of river pollution Free Essay Example

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  2. HESS

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  1. (PDF) Why is the Arkavathy River drying? A multiple ...

    Changes in hydrology and hydrometeorology of the Arkavathy Basin, 1970-2010. (a) Annual inflows into the TG Halli reservoir . The 1938-1975, 1975-2000 and 2000-2010 median and mean annual ...

  2. PDF Why is the Arkavathy River drying?

    The case study shows that direct human interventions play a significant role in alter-ing the hydrology of watersheds. The multiple working hypotheses approach presents 25 a systematic way to quantify the relative contributions of anthropogenic drivers to hy-drologic change. The approach not only yields a meaningful contribution to the policy

  3. Water Quality Issues in The Arkavathy Sub-basin

    affected by nitrate pollution, which is not surprising, given that this tank is situated on the highly polluted Vrishabhavathy River. In another study also, nitrate levels Table 4: Nitrate levels in groundwater in talukas overlapping with the Arkavathy sub-basin Taluka Anekal Bangalore North Bangalore South Doddaballapur Kanakapura Magadi ...

  4. PDF Why is the Arkavathy River drying? A multiple-hypothesis approach in a

    the Arkavathy watershed in southern India. Five possible hy-potheses that link anthropogenic and climatic changes to the water scarcity in the watershed are outlined and investigated. 2 The problem: drying of TG Halli reservoir 2.1 Description of study area The Arkavathy River is located in the state of Karnataka in southern India (Fig.1).

  5. HESS

    The paper asks why the Arkavathy River in southern India is drying. The study results indicate that anthropogenic drivers like groundwater pumping, eucalyptus plantations and channel fragmentation are much more likely to have caused the decline than changing climate.

  6. Why is the Arkavathy River drying? A multiple hypothesis approach in a

    Water planning decisions are only as good as our ability to explain historical trends and make reasonable predictions of future water availability. But predicting water availability can be a challenge in rapidly growing regions, where human

  7. PDF Why is the Arkavathy River drying? A multiple hypothesis approach in a

    30 The case study shows that direct human interventions play a significant role in altering the hydrology of watersheds. The ... Why is the Arkavathy River drying? 3 ad-hoc decisions. There is an ...

  8. Water Quality Analysis And Scientific Remediation Of River Arkavathi

    In this study, the water samples are collected from 8 selected sampling stations of Arkavathi River during the study period of post monsoon month in February 2020 for physio-chemical analysis and ...

  9. Urbanization: an increasing source of multiple pollutants to rivers in

    Most of the global population will live in urban areas in the 21st century. We study impacts of urbanization on future river pollution taking a multi-pollutant approach. We quantify combined point ...

  10. Global river water quality under climate change and ...

    Comparison of 965 case studies indicates that river water quality generally deteriorates under droughts and heatwaves (68% of compiled cases), rainstorms and floods (51%) and under long-term ...

  11. PDF Proximate and underlying drivers of socio-hydrologic change in the

    5 This case study of the data-scarce, upper Arkavathy watershed, near the city of Bengaluru in south- ... and north east (Oct-Dec) monsoons. The main stem of the Arkavathy River has its headwaters in the Nandi Hills north of Bengaluru and is joined by its first major tributary, the Ku-80 mudavathy River at Thippagondanahalli village, where the ...

  12. Water management in Arkavathy basin: A situation analysis

    Enter the email address you signed up with and we'll email you a reset link.

  13. Water Management in Arkavathy basin: a situation analysis

    The Arkavathy sub-basin, which is part of the Cauvery basin, is a highly stressed, rapidly urbanising watershed on the outskirts of the city of Bengaluru. The purpose of this situation analysis document is to summarise the current state of knowledge on water management in the Arkavathy sub-basin and identify critical knowledge gaps to inform future researchers in the basin.

  14. Action plan workshop for the rejuvenation and sustenance of the

    A one-day "Action plan workshop for the rejuvenation and sustenance of Arkavathi river basin", was organised on 25th July 2009, by the Global Academy of Technology and Geological Society of India at Bangalore, to discuss the future of the dying Arkavathi river and Bangalore's precarious water situation, and to develop concurrent implementable action plans to address the problem.

  15. 'Water Management in Arkavathy Basin: A Situation Analysis'

    The Arkavathy River feeds a series of cascading tanks . ... is illustrated by a set of case studies of Tataguni, ... monitored the level of pollution in groundwater of the .

  16. Arkavathi River

    Arkavathi River. / 13.368689; 77.681335. / 12.287986; 77.432141. The Arkavati is an important mountain river in Karnataka, India, originating at Nandi Hills of Chikkaballapura district. [1] It is a tributary of the Kaveri, which it joins at 34 km south of Kanakapura, Ramanagara District called Sangama in Kannada, after flowing through ...

  17. PDF Proximate and underlying drivers of socio-hydrologic change in the

    Figure 1. Map of the upper Arkavathy Watershed, showing regional context within (a) India and (b) KarnatakaBengaluru state, (c) the TG Halli watershed, and (d,e) two intensively-studied milliwatersheds . The Bengaluru (Banga- lore) urban area is shown in red on the eastern boundary of the watershed. 2 Study Area The upper Arkavathy (TG Halli ...

  18. Estimating turbidity concentrations in highly dynamic rivers ...

    The surface water quality monitoring of the Godavari River is managed by the Central Pollution Control Board (CPCB), and the data is maintained by the India Water Resources Information System (WRIS); thus, the in situ turbidity data were obtained from the WRIS in this study. ... Case study of the Godavari River, India. Environ Sci Pollut Res ...

  19. Water management in Arkavathy basin: A situation analysis

    It also shows a cluster of villages Two studies (Ramesh et al. 2012; Shashirekha 2009) located downstream of Byramangala tank being monitored the level of pollution in groundwater of the affected by nitrate pollution, which is not surprising, Peenya industrial area in the northern Arkavathy basin. given that this tank is situated on the highly ...

  20. Water management in Arkavathy basin: A situation analysis

    So, we focus here on the quality of surface water used for irrigation. Faecal coliforms : Monitoring studies conducted in the Arkavathy sub-basin indicates the presence of FCs in water samples both from Byramangala tank and Arkavathy River downstream of Kanakapura town (CPCB 2012; Prakash and Somashekar 2006; Singh et al. 2009).

  21. PDF River Water Pollution:A Case Study on Tunga River At Shimoga-Karnataka

    In this study, seasonal variations of physico-chemical and bacteriological characteristics of water quality in Tunga river was assessed in Shimoga town in Karnataka. A. Study Area. Shimoga is town, situated between the North and South branches of river Tunga. It is located on the Bangalore - Honnavar highway.Though it is a town of medium ...

  22. HESS

    The causes of the drying are poorly understood, resulting in misdirected or counter-productive management responses. Five plausible hypotheses that could explain the decline were tested using data from field surveys and secondary sources: (1) changes in rainfall amount, seasonality and intensity; (2) increases in temperature; (3) groundwater ...

  23. PDF River Pollution: A Case Study of Panchaganga River

    "Correlation Study for Assessment of Water Quality and Its Parameters of Par River Valsad, Gujarat, India", International Journal of Innovative and Emerging Research in Engineering, 150-156. [5] Leslie Danquah, (2010) "The Causes and Health Effects Of River Pollution- A Case Study of Aboabo River Kumasi".