Managing riparian zones for river health improvement: an integrated approach

Landscape and Ecological Engineering, Journal Year: 2021, Volume and Issue: 17(2), P. 195 - 223

Published: Jan. 3, 2021

Language: Английский

---

Flow resistance of floodplain vegetation mixtures for modelling river flows

Journal of Hydrology, Journal Year: 2021, Volume and Issue: 601, P. 126593 - 126593

Published: June 29, 2021

River flows are greatly influenced by floodplain vegetation with implications on hydrological and hydraulic conditions from cross-sectional to river reach scales. Flow models need reliably reflect changes in the riverine environment, such as growth associated altered flow regimes, increased sediment loads eutrophication. Leaf area index (LAI) based approaches increasingly used tools predict resistance caused natural vegetation. However, current LAI-based modelling involves uncertainty at low high densities velocities due a lack of research validation outer ranges. The aim this paper is investigate for mixture flexible consisting woody plants understory grasses (LAI = 1–5) over wide range mean (0.05–1.2 m/s) relative submergences 1–2. A novel flume setup was designed using high-accuracy pressure sensors measure force plant drag forces. decreased 35–90% when submergence H/hv 1 2, which highly relevant flows. results provided new evidence that vegetative friction factors can be extended LAI values non-submerged adjustments existing required water stages higher than height. Furthermore, cannot neglected often assumed literature especially cases submergences.

Language: Английский

---

Effects of agricultural land use on river biota: a meta-analysis

Environmental Sciences Europe, Journal Year: 2022, Volume and Issue: 34(1)

Published: Dec. 1, 2022

Abstract Agriculture, the world’s most dominant land use type, burdens freshwater biodiversity with a multitude of stressors such as diffuse pollution and hydromorphological alteration. However, it is difficult to directly link agricultural biota response can also originate from other causes. Also, there evidence for positive negative effects agriculture on organisms, impact differs strongly biological metric study region considered among practice which in turn affects different organism groups varying severity. Against this background, our aimed at assessing, if has consistent effect river biota. We conducted systematic review literature, yielded 43 studies 76 relationships between aquatic groups. The were subjected meta-analysis using Hedge’s g calculate standardized mean difference effects. Overall, we detected medium strong = − 0.74 biota, only marginally influenced by design, type region. Strong differences could be observed depending assessed, ecological quality indices impairment performing best. Sensitive taxa declined impact, while tolerant tended benefit. In addition, differed types practices group, macroinvertebrates showing strongest effect. Our results quantify riverine suggest assessing impact. Further research needed discriminate account intensity.

Language: Английский

---

Much effort, little success: causes for the low ecological efficacy of restoration measures in German surface waters

Environmental Sciences Europe, Journal Year: 2023, Volume and Issue: 35(1)

Published: April 30, 2023

Abstract Background For more than 20 years, restoration measures have been conducted on watercourses in Germany to increase habitat diversity and thus promote biodiversity. However, their ecological efficacy often proved be limited. While some studies report an species diversity, others show little evidence of improvement even many years after the implementation measures. In general, hydromorphological is highest for terrestrial semiaquatic groups organisms such as floodplain vegetation ground beetles. According literature, macrophytes responded most strongly in-stream measures, while fish stocks showed macroinvertebrates or no effect terms richness diversity. These findings raise question reasons low especially macroinvertebrate communities. The following literature review a case study river Horloff will provide possible indications failing success intensive Results One reason inadequate status restored stretches inappropriate scaling Often, small-scale are planned, although respective water bodies exhibit stressors at catchment scale that impair particular, chemical contamination running waters insufficiently addressed planning hampers holistic resource management, should therefore closely coordinated harmonized between federal states neighboring countries. this purpose, establishment so-called basin communities suitable, they already exist today rivers Rhine, Danube, Meuse, Weser, Elbe, Ems, Eider, Schlei/Trave, Warnow/Peene. Conclusion indicated successful recolonization by enhancement status, large-scale stressors, i.e., acting scale, eliminated initially focusing surrounding land use. Structural reach local ideally implemented contemporarily removal like contamination.

Language: Английский

---

Riparian Zone Assessment and Management: an Integrated Review Using Geospatial Technology

Water Air & Soil Pollution, Journal Year: 2023, Volume and Issue: 234(5)

Published: May 1, 2023

Language: Английский

---

Integrated management of the Ganga River: An ecohydrological approach

Ecohydrology & Hydrobiology, Journal Year: 2019, Volume and Issue: 20(2), P. 153 - 174

Published: Nov. 4, 2019

Language: Английский

---

Evaluating multiannual sedimentary nutrient retention in agricultural two-stage channels

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 3, 2025

Abstract The two-stage channel (TSC) design with a vegetated man-made floodplain has been recommended as an alternative to conventional re-dredging for managing suspended sediment (SS) and nutrient loads in agricultural streams. However, there are currently uncertainties surrounding the efficiency of TSCs, since mass balances covering whole annual hydrograph including different periods life cycle lacking. This paper aims improve understanding medium-term morphological development sedimentary retention when dredged, trapezoidal-shaped is converted into TSC, using balance estimate carbon from immediately after excavation until establishment approximate biogeochemical equilibrium retention. We developed framework allowing estimation net phosphorus (P), nitrogen (N) (C) considering differences initial mature conditions topsoil between parts. Further, we conducted repeated elevation surveys analyses vertical elemental chemistry over 9-year period apply at pilot site Southern Finland. TSC significantly retained SS nutrients while low-flow did not suffer siltation, supporting hypothesized enhanced self-cleansing capacity TSCs compared trapezoidal cross-sections. Because flushing earlier bed deposits, was release SS, P, N first 9 years entire system. Depending on element part considered, physical deposition constituted 13‒79% newly exposed, excavated surfaces, remainder could be attributed retention, enriching carbon. highly suitable assess systems. As novelty, improves reliability evaluation typically used snapshot water quality sampling allows prioritizing required coring further sites. results allow heterogeneities process rates quantified potential inefficiencies due morphology identified.

Language: Английский

---

Impacts of Habitat Management on Larvae of the Damselfly Coenagrion mercuriale (Coenagrionidae, Odonata)—A Laboratory Study

River Research and Applications, Journal Year: 2025, Volume and Issue: unknown

Published: May 7, 2025

ABSTRACT Habitat management of small lotic waterbodies is essential to maintain flow and the quality habitats. For this purpose, aquatic plants are typically removed by authorities. This done in a more or less disruptive manner, depending on risk interference with bed. Since biodiversity‐rich habitats, effects habitat macroinvertebrates need be analyzed. In particular, we analyzed plant preferences, tolerance sediment burial, thanatosis derive recommendations for current management. A choice experiment larvae threatened damselfly Coenagrion mercuriale was conducted identify preferences between four different plants, namely Callitriche spp., Elodea canadensis , Phragmites australis Veronica beccabunga which all typical C. larval We aimed investigate if specific should avoided when removing vegetation during addition, two further scenarios : fine burial (reflex immobilization), can both induced machines. The showed no significant except direct comparison V. spp. found that majority were tolerant 1 cm; thicker layers rare. On absorbent paper, duration differed in‐water out‐of‐water. Larvae out‐of‐water stayed longer, increasing predation being present study shows activities have impacts larvae. These considered choosing performing appropriate waterbodies.

Language: Английский

---

The effects of recreational and commercial navigation on fish assemblages in large rivers

The Science of The Total Environment, Journal Year: 2018, Volume and Issue: 646, P. 1304 - 1314

Published: July 30, 2018

Language: Английский

---

Assessment of cultivation intensity can improve the correlative strength between agriculture and the ecological status in rivers across Germany

Agriculture Ecosystems & Environment, Journal Year: 2023, Volume and Issue: 361, P. 108818 - 108818

Published: Nov. 22, 2023

Agriculture has been identified as a main cause for more than 90% of Germany´s rivers still not meeting good ecological status in 2021. While many large-scale studies observed negative effect catchment agricultural land use on river biota, they rarely considered differences cultivation intensities, although small-scale highlight clear between the effects crops. Here we used Germany-wide and spatially explicit information crop types to calculate intensity indices nutrients pesticides, weighting different based average pesticide treatment nutrient application rates. These were then explanatory variables n = 7677 biological sampling sites. Pesticides important pollution macroinvertebrates macrophytes, while diatoms sensitive nutrients. Considering most relevant index (pesticide or nutrient) slightly increased correlative strength with status, compared correlation cropland cover by up R² 0.14 diatoms. Correlative was substantially larger small mountain (pre)-alpine streams lowland streams, an 0.43 macroinvertebrates. results only confirm previous demonstrating detrimental present-day agriculture but also shed light pathways involved, particularly highlighting adverse impacts agrochemicals. Consequently, protect shift sustainable practices, like reducing application, is urgently required.

Language: Английский

---