A decade of fluvial morphodynamics: relocation and restoration of the Inde River (North-Rhine Westphalia, Germany)

Maaß, A.‐L.; Esser, Verena; Frings, Roy M.; Lehmkuhl, Frank; Schüttrumpf, Holger

doi:10.1186/s12302-018-0170-0

Cited by 20 publications

(9 citation statements)

References 24 publications

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“…As this is the first study to report an increase in toxicity as well as estrogenic and dioxin-like activity in restored river sections, this may explain the lack of success of many other in-stream restoration projects [13,29,[31][32][33]. A possible explanation for the significantly worse results within the restored sections is the transport and deposition of polluted fine sediments within the restoration measures [18,[119][120][121]. Since the restored sections are characterized by a higher flow diversity, it is conceivable that polluted fine particulate matter, e.g., introduced by soil erosion from surrounding fields [122][123][124][125] or by WWTPs [107,125], may settle in the flow-calmed zones [119,[126][127][128].…”

Section: Comparison Of the Rivers Horloff And Niddamentioning

confidence: 90%

Poison in paradise: increase of toxic effects in restored sections of two rivers jeopardizes the success of hydromorphological restoration measures

et al. 2019

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Background: To date, only 8.2% of German surface waters achieve a good ecological status according to the European Water Framework Directive. This is primarily attributed to structural deficits, intensive land use, and chemical contaminations of water bodies. In this context, hydromorphological restoration measures are implemented with the aim to increase habitat and species diversity and thus improve the ecological status of water bodies. Nevertheless, existing studies show that restorations promote the reintroduction of individual species, but only in exceptional cases an improvement in the ecological status is achieved. Therefore, we examined the impact of the prevailing chemical contamination on the restoration success in the catchment of the river Nidda in Hessen (Germany) by comparing restored river sections at the rivers Nidda and Horloff with unrestored sections upstream (space-for-time-substitution) and a transect downstream the restoration measures. For this purpose, we conducted active biomonitoring campaigns with Potamopyrgus antipodarum and Gammarus fossarum and analyzed water and sediment samples with effect-based in vitro bioassays. Results: At the river Horloff, mortality of P. antipodarum and toxicity in water samples measured via the microtox assay were highest within the restoration. At the river Nidda, the reproduction of snails and gammarids significantly increased within the restorations, and reproduction of snails correlated positively and significantly with estrogenic activities. The microtox assay also exhibited the highest toxicities in water and sediment samples from the restorations and dioxin-like as well as estrogenic activities significantly increased compared to the unrestored reference site. On the basis of these results, the prevailing chemical contamination has negatively affected snails and gammarids in the active biomonitoring campaigns and consequently is likely to have also a negative impact on the local invertebrate community and thus endangers the restoration success. Conclusion:Hydromorphological restorations as a stand-alone measure are insufficient to improve the ecological status of a water body as long as the water and sediment quality remain deficient. Therefore, it is necessary to improve water and sediment quality in parallel with hydromorphological restoration measures to achieve the objectives of the EU-WFD. which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Section: Comparison Of the Rivers Horloff And Niddamentioning

confidence: 90%

Poison in paradise: increase of toxic effects in restored sections of two rivers jeopardizes the success of hydromorphological restoration measures

et al. 2019

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“…Recently, several studies focused on the anthropogenic history of the Wurm River and rivers like the Geul River or the Inde River with similar geomorphic settings, SSLs, and catchment sizes. The results of different studies by Buchty‐Lemke and Lehmkuhl (), Hagemann et al (), Maaß and Schüttrumpf (, ), and Maaß et al () show that floodplain sedimentation rates can be in an order of magnitude of 1 cm/year if the floodplains are prone to overbank flooding due to a constant impoundment of water at mill weirs and can be decreased to 0.1 cm/year due to incised riverbeds and riverbank heights of approximately 2 m. Here, the floodplain sedimentation rates of all numerical model scenarios vary between 0.5 and 1 cm/year that overall include natural as well as anthropogenic impacted floodplain accretion conditions of small river systems.…”

Section: Discussionmentioning

confidence: 99%

“…River restoration interventions in old‐industrial areas such as the ones analyzed in this study can have negative effects on the distribution of contaminants or positive effects because of the improvement of chemical and ecological conditions (Maaß et al, ). It is important to evaluate the contamination of a study site using its natural state because the initiation of natural morphodynamics includes the transport of fine sediment as an intrinsic component of river‐floodplain systems.…”

Section: Discussionmentioning

confidence: 99%

Reactivation of Floodplains in River Restorations: Long‐Term Implications on the Mobility of Floodplain Sediment Deposits

Maaß

Schüttrumpf

2019

Water Resources Research

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Nowadays, national and international requirements and laws emphasize the “natural” development of river‐floodplain systems. One goal is to increase the connectivity between the river and its floodplains and thus reactivate floodplains as flooding areas, which potentially increases the mobility of fine sediments. The objective of this study is to analyze the long‐term effects of reactivated floodplains on the mobility of floodplain deposits of small rivers based on two river restoration scenarios: elevating the riverbed or lowering the floodplains. Past channel fixation and degradation as well as the subsequent increase in the floodplain elevation led to the decoupling of the channel and floodplain morphodynamics associated with the reduction of the habitat connectivity. Here, the floodplain sedimentation rates were determined using a numerical model based on the Delft3D software. The novelty of these numerical investigations is the morphological long‐term analysis over timescales of decades, which is not comparable to other short‐term hydrodynamic and morphodynamic studies for small meandering lowland rivers. The results of 11 river restoration scenarios show that lowering the floodplain and raising the riverbed elevation both lead to an increase in the fine sediment deposition on the floodplain. However, lowering the floodplain elevation is generally more effective. Based on the numerical model results and the assumption of a fixed river channel, only anthropogenic activity might have increased the amount of fine sediments deposited on floodplains and has accelerated the decoupling of the floodplains from the riverbed in the past centuries.

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“…Soma-se a isso ainda os custos de tal atividade que oneram o estado e os empreendimentos (HACKNEY et al, 2017). A diminuição do calado operacional máximo é algo que impacta de modo direto as dimensões das embarcações que podem acessar o rio, podendo se tornar um grande problema em determinados casos (VOLP et al, 2016;MAAB et al, 2018).…”

Section: Introductionunclassified

Mapa Batimétrico De Assoreamento Como Apoio À Navegação Na Amazônia: Caso No Rio Tapajós/Pa

Mácola¹,

Mácola²,

Moraes³

et al. 2023

Terra Do Mar Doce: Contribuições Da Academia Para a Navegação Na Amazônia

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RESUMOO artigo teve como objetivo descrever a morfologia do leito do rio Tapajós, compreender o padrão de assoreamento que ocorreu no canal de navegação, no trecho entre a cidade de Aveiro e a localidade de Fordlândia, com base em dados dos levantamentos batimétricos no ano de 2021. De igual modo, este estudo pretende avaliar a vazão sólida dos sedimentos em suspensão e a vazão liquida associada, medida com ADCP em agosto e outubro em Aveiro e Fordlândia. Para o efeito, elaborou-se o mapa batimétrico temático, com a identificação específica e sazonal dos pontos de assoreamento ao longo do ano. Aponta-se que se obteve mapas cartográficos por meio de levantamento batimétrico com equipamento monofeixe, em trecho compreendido entre o município de Aveiro e o distrito de Fordlândia, no Estado do Pará, sendo selecionados dois trechos, utilizando como referência as cartas náuticas da região e imagens de satélite, associados ao levantamento expedito nesses trechos. Foram produzidos novos mapas com a identificação dos subtrechos críticos, por períodos do ano, além de comparação com diversos casos de acidentes com embarcações e relatórios de escoamento da produção. Concluiu-se que, o trecho em estudo tende a ser estável no que se refere à profundidade e ao traçado do canal, ao se considerar a região de média e de cheia vazão, notou-se que há aumento da vazão líquida de aproximadamente 3000m³/s em Aveiro, já em Fordlândia esse valor cai para 1000 m³/s.

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A decade of fluvial morphodynamics: relocation and restoration of the Inde River (North-Rhine Westphalia, Germany)

Cited by 20 publications

References 24 publications

Poison in paradise: increase of toxic effects in restored sections of two rivers jeopardizes the success of hydromorphological restoration measures

Poison in paradise: increase of toxic effects in restored sections of two rivers jeopardizes the success of hydromorphological restoration measures

Reactivation of Floodplains in River Restorations: Long‐Term Implications on the Mobility of Floodplain Sediment Deposits

Mapa Batimétrico De Assoreamento Como Apoio À Navegação Na Amazônia: Caso No Rio Tapajós/Pa

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