The coupled socio-ecohydrological evolution of river systems: Towards an integrative perspective of river systems in the 21st century

Hein, Thomas; Hauer, Christoph; Schmid, Martin; Stöglehner, Gernot; Stumpp, Christine; Ertl, Thomas; Graf, Wolfram; Habersack, Helmut; Haidvogl, Gertrud; Hood-Novotny, Rebecca; Laaha, Gregor; Langergraber, Günter; Muhar, Susanne; Schmid, Erwin; Schmidt‐Kloiber, Astrid; Schmutz, Stefan; Schulz, Karsten; Weigelhofer, Gabriele; Winiwarter, Verena; Baldan, Damiano; Canet-Martí, Alba; Eder, Markus; Flödl, Peter; Kearney, Katharina; Ondiek, Risper Ajwang’; Pucher, Bernhard; Pucher, Matthias; Simperler, Lena; Tschikof, Martin

doi:10.1016/j.scitotenv.2021.149619

Cited by 28 publications

(11 citation statements)

References 66 publications

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“…Comparisons between different geopolitical and societal systems can support solution finding in socio-ecological restoration in different ways. First, despite large local differences, there are also generalities in the evolution of human-river-relationships (Wantzen et al, 2016(Wantzen et al, , 2022Hein et al, 2021) that may help to identify the current socio-environmental status of the studied system and the nearest and future targets for restoration projects. Moreover, seeing one's study object through the perspective of another cultural background may reveal overlooked (or forgotten) thematics and inspire innovative 10.3389/fevo.2022.838794 approaches.…”

Section: Discussionmentioning

confidence: 99%

Back to the surface – Daylighting urban streams in a Global North–South comparison

et al. 2022

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Many urban streams have vanished from the surface as a collateral effect of urban growth. Often, these buried streams have been forgotten, and only street names remind us of their existence. Reasons for stream burial include the gain of space for road or house construction or the use of stream water to transport wastewater. Today, restoration efforts to bring back fully canalized streams to the surface and to restore their stream bed (so-called daylighting) are being increasingly integrated into urban blue-green space planning, recognizing the high ecological and social value of urban streams, especially to support resilience against climate change impacts in cities. In this paper, we briefly revise the impacts of stream burial, present a series of case studies of daylighting from Europe (France, Switzerland, and Germany), and compare them with case studies from Asia (China, India, Taiwan). We found that high real estate prices, limited buffer riparian zone and resistance by the inhabitants were the greatest obstacles to stream daylighting projects. In contrast, economic gains from separating wastewater from rainwater and revival of cultural linkages with water were the strongest drivers to restore these streams. We then present methods on how to identify buried streams as candidates for daylighting and deliver criteria to select the most promising candidates. Acknowledging that each restoration project requires to be adapted to the local biophysical and local setting, we deliver a preliminary decision support system and a guideline for identifying the best candidate streams for daylighting projects, including the arguments in favor of restoration, the caveats, the social processes of decision-making, and perspectives for the integration of stream daylighting into urban climate change mitigation and adaptation concepts, in a Global North-South comparison.

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Section: Discussionmentioning

confidence: 99%

Back to the surface – Daylighting urban streams in a Global North–South comparison

et al. 2022

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“…Apart from the well‐known impacts of dams that reduce sediment and water flow (Grill et al, 2019; Kondolf et al, 2014), both rhythm and the variability of flow was changed into unprecedented and often arrhythmic patterns. The original hydrology of rivers – in the literature called the natural flow regime (Poff et al, 1997), environmental flows (Arthington et al, 2018; Bunn & Arthington, 2002), or the flood pulse (Junk et al, 1989; Junk & Wantzen, 2004) – have become transformed into monotonous, ‘domesticated’ flows (Hein et al, 2021; Tockner et al, 2011).…”

Section: Human Adaptations To and Modifications Of Environmental Flowsmentioning

confidence: 99%

River culture: How socio‐ecological linkages to the rhythm of the waters develop, how they are lost, and how they can be regained

Wantzen

2022

Geographical Journal

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This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. The information, practices and views in this article are those of the author(s) and do not necessarily reflect the opinion of the Royal Geographical Society (with IBG).

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“…Rivers are vital natural resources that provide important ecosystem services to humans, including fish, drinking water, flood control, and various economic activities [ 1 , 2 , 3 ]. However, because of human activities, such as the construction of China’s Three Gorges Dam and the “South-to-North Water Diversion” project (SNP), river ecosystems have been continuously degraded.…”

Section: Introductionmentioning

confidence: 99%

Reducing the Risk of Benthic Algae Outbreaks by Regulating the Flow Velocity in a Simulated South–North Water Diversion Open Channel

Sun

Liu

et al. 2023

IJERPH

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The reduction in open-channel flow velocity due to China’s South-to-North Water Diversion Project (SNP) increases the risk of benthic algal community blooms resulting in drinking water safety issues. Consequently, it has attracted attention from all walks of life. However, regulatory measures to mitigate the risk of algal blooms and the main risk-causing factors are unclear. This study simulated the river ecosystem of the SNP channel through water diversion. Simulated gradient-increasing river flow velocity affects environmental factors and benthic algal alterations, and can be used to explore the feasibility of regulating the flow velocity to reduce the risk of algal blooms. We found that the algal biomasses in the velocity environments of 0.211 and 0.418 m/s decreased by 30.19% and 39.88%, respectively. Community structure alterations from diatoms to filamentous green algae were 75.56% and 87.53%, respectively. We observed significant differences in biodiversity, especially in terms of richness and evenness. The α diversity index of a species is influenced by physical and chemical environmental factors (especially flow velocity). Our study revealed that flow velocity is the main factor affecting the growth and outbreak of benthic algae. The risk of algal blooms in open channels can be effectively mitigated by regulating the flow velocity. This provides a theoretical basis for ensuring the water safety of large-scale water conservancy projects.

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The coupled socio-ecohydrological evolution of river systems: Towards an integrative perspective of river systems in the 21st century

Cited by 28 publications

References 66 publications

Back to the surface – Daylighting urban streams in a Global North–South comparison

Back to the surface – Daylighting urban streams in a Global North–South comparison

River culture: How socio‐ecological linkages to the rhythm of the waters develop, how they are lost, and how they can be regained

Reducing the Risk of Benthic Algae Outbreaks by Regulating the Flow Velocity in a Simulated South–North Water Diversion Open Channel

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