River restoration challenges with a specific view on hydromorphology

Li, Jianhua; Hoerbinger, Stephan; Weissteiner, C.; Peng, Lingmin; Rauch, Hans Peter

doi:10.1007/s11709-020-0665-9

Cited by 5 publications

(5 citation statements)

References 21 publications

(31 reference statements)

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“…This confirmed the results of the work of researchers, such as Kujanová and Matoušková [57] and Biron et al [51], who observed similar phenomena in small rivers where renaturalisation processes were initiated by means of small channel structures. Similar local phenomena have already been observed on the Flinta, where plant baskets were introduced into the channel current as part of a pilot project [31,58]. In these papers, various advantages of plant basket hydraulic structures operating as sediment traps in river channels were presented.…”

Section: Influence Of Deflectors On the Hydromorphological Changessupporting

confidence: 60%

“…The analyses concerned hydromorphological processes initiated by the introduction of wicker deflectors. The Flinta River was selected as part of the national programme for the renaturalisation of surface waters in Poland [15], and a team of researchers from the Pozna ń University of Life Sciences had already conducted renaturalisation-related research projects on this section of the Flinta [31]. This research indicated that the watercourse possesses high ecological potential, prompting the team to explore opportunities to improve its ecological status by restoring meanders of the Flinta.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Restoration and Changes of Sediment and Hydrodynamic Parameters in a Section of a Renaturalised Lowland Watercourse

Zaborowski,

Kałuża,

Jusik

et al. 2024

Sustainability

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In Europe, the routes of most watercourses were straightened and shortened, leading to the destruction and degradation of many natural environments. Currently, in places where it is possible, as part of the implementation of the Water Framework Directive, efforts are made to improve environmental sustainability, including improving the ecological condition of rivers. This paper presents the impact of three in-stream deflectors on changes in the section of a small lowland river—the Flinta (Poland)—where (from 2018 to 2023) detailed, systematic geodetic, and hydrometric research and an assessment of the ecological conditions were carried out. The presented results show the influence of deflectors on the initiation of fluvial processes in the transverse and longitudinal layouts of the channel. The river channel was narrowed from 6 to 5 m, and the current line shifted by almost 3 m. Changes were observed in the distribution of velocities and shear stresses, varying along the surveyed section of the river. In the first year after their application, an increase in velocity at the deflectors can be observed (from 0.2 m∙s−1 to 0.6 m∙s−1 in the deflector cross-section). In the following years, on the other hand, a clear decrease in velocity was observed in the sections between the deflectors (to 0.3 m∙s−1). The introduction of deflectors resulted in a significant increase in the values of shear stresses (from an average value of 0.0241 N∙m−2 in 2018 to 0.2761 N∙m−2 in 2023) and local roughness coefficients (from 0.045 s∙m−1/3 before the introduction of the deflectors to 0.070 s∙m−1/3 in 2023). Based on analyses of sediment samples, erosion and accumulation of bottom material were initially observed, followed by a subsequent stabilisation of particle size. Differences in grain size were observed, especially in the cross-section of the deflectors (increase in granularity d50% downstream of the deflector from 0.31 mm to 3.9 mm already 2 years after the introduction of deflectors). This study confirmed the positive impact of using deflectors on hydromorphological processes as deflectors facilitate the achievement of a good ecological status, as required by the WFD. The innovation of this paper lies in demonstrating the possibility of using small, simple structures to initiate and intensify fluvial processes, which may contribute to improving the ecological conditions of watercourses.

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Section: Influence Of Deflectors On the Hydromorphological Changessupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Environmental Restoration and Changes of Sediment and Hydrodynamic Parameters in a Section of a Renaturalised Lowland Watercourse

Zaborowski,

Kałuża,

Jusik

et al. 2024

Sustainability

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“…Harnessing the streams through channelisation often results in a decreased water table in adjacent segments but induces an increased water table downstream. The heavily modified water bodies disturb hydraulic repercussions, hydrological regimes and fluvial processes across spatial/ temporal scales [22]. The sediment transport impacts the morphology (erosion/ deposition pattern) and biodiversity in the water streams, being the source of nutrients [23].…”

Section: Mississippi River Usa -Partial Efficacy Of Eia As a Tool For...mentioning

confidence: 99%

The Critical Review of the Efficacy of the Environmental Impact Assessment (EIA) Process as A Tool Intended to Protect the Environment from Construction/ Development's Hazards

Nadir¹,

Ahmed²

2023

J Civ Eng Res Technol

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The developed countries have been doing extraordinary marvels in science, technology and construction with a desire to tame nature coherently. This domination desire has negatively/ irreversibly impacted the environment. However, after generating enormous challenges to nature through uncontrolled developments, the developed countries started endeavouring to save the environment from the devastating impacts of construction projects at the end of the 20th century by incorporating the environmental impact assessment (EIA). EIA is the process of identifying, evaluating, and mitigating development projects' damaging environmental and social effects. In the last 25 years, EIA has developed into a mature system and is an effective tool for assessing, minimising and mitigating severe impacts of development projects on the environment. EIA is only an assessment tool to ascertain the damaging effects of projects on the environment and alternative proposals for their mitigation; however, the final decision rests with political authorities who may consider the EIA report or turn it down in the name of better interests of society/country. Unfortunately, EIA has not proved to be a fully effective process as the developed countries are still undertaking unobstructed/ unopposed mega development projects best conforming to their better interests, and developing countries are still far behind in the apprehension of the necessity of EIA. However, with the UN, USA and EU efforts, more than 120 countries have pledged to exercise EIA to assess development projects before their commencement. In this study, an endeavour has been made to review the necessity/ objectives of EIA, its historical evolutionary process, internationally recognised legal obligations, the stages of the EIA process based on the nature of projects, constraints/ pros and cons of the implementation of EIA process and efficacy of EIA as an intended tool to save the environment from the hazards of mega projects duly supported by three case studies of international projects in USA, Sweden and Pakistan.

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“…On the one hand, human activities concerning fluvial engineering aim to provide services and functions, but on the other hand, they have severe negative impacts on many services provided by the fluvial ecosystems [4]. According to Grill et al (2015) [5], nearly 50% of In China, the rapid urbanization in recent decades and the accompanying impacts on water bodies, such as water pollution or flood control regulations, have led to a high rate of habitat destruction within fluvial ecosystems [6]. Due to the appearance of clear signs of ecosystem degradation (e.g., extinction of red list species, massive riverbed incisions), the awareness of ecosystem functions and therefore ecosystem restoration is rising and stated within several frameworks and legislation.…”

Section: Introductionmentioning

confidence: 99%

“…Many human impacts are strongly connected to hydromorphology [6]. Physical conditions build the basis for the establishment and organization of fluvial ecosystems [7] and therefore have a major influence on the ecological status.…”

Section: Introductionmentioning

confidence: 99%

Hydromorphological Assessment as the Basis for Ecosystem Restoration in the Nanxi River Basin (China)

Müller

Hoerbinger

Franta

et al. 2022

Land

Self Cite

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Hydromorphology is a major component of riverine ecosystems. Therefore, proper assessments of the status quo, as well as the detection of pressures in river basins, are of high relevance. Process-based morphological methods have been developed, relying on a broad data basis and resulting in suitable instruments, such as the Morphological Quality Index (MQI). In this study, the hydromorphological status of the Nanxi river system in Eastern China was assessed by an adapted application of the MQI. Adaptations and amendments in the methodical approach were developed in cycles and carried out to transfer the well-approved method for European river systems to another geographical setting. The strengths of the tested approach are the few data requirements, the applicability for modified river basins, and the decoupling of historical information. The assessment of 161 river kilometers resulted in a hydromorphological status quo with the focus being a relative comparison of different sections ranging from “moderate” to “bad”, with an average classification of a “poor” state. On the one hand, the results build the basis for future restoration and river management planning, specifically, and on the other hand, they create a foundation for the development of an assessment method fitted for modified river systems conditions.

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River restoration challenges with a specific view on hydromorphology

Cited by 5 publications

References 21 publications

Environmental Restoration and Changes of Sediment and Hydrodynamic Parameters in a Section of a Renaturalised Lowland Watercourse

Environmental Restoration and Changes of Sediment and Hydrodynamic Parameters in a Section of a Renaturalised Lowland Watercourse

The Critical Review of the Efficacy of the Environmental Impact Assessment (EIA) Process as A Tool Intended to Protect the Environment from Construction/ Development's Hazards

Hydromorphological Assessment as the Basis for Ecosystem Restoration in the Nanxi River Basin (China)

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