Flow resistance parameters for natural emergent vegetation derived from a porous media model

River hydrodynamicsOverbank flows and vegetatio

3D Modelling of the Flow Distribution in the Delta of Lake Oyeren (Norway)

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Bringing the margin to the focus: 10 challenges for riparian vegetation science and management

Riparian zones are the paragon of transitional ecosystems, providing critical habitat and ecosystem services that are especially threatened by global change. Following consultation with experts, 10 key challenges were identified to be addressed for riparian vegetation science and management improvement: (1) Create a distinct scientific community by establishing stronger bridges between disciplines; (2) Make riparian vegetation more visible and appreciated in society and policies; (3) Improve knowledge regarding biodiversity—ecosystem functioning links; (4) Manage spatial scale and context-based issues; (5) Improve knowledge on social dimensions of riparian vegetation; (6) Anticipate responses to emergent issues and future trajectories; (7) Enhance tools to quantify and prioritize ecosystem services; (8) Improve numerical modeling and simulation tools; (9) Calibrate methods and increase data availability for better indicators and monitoring practices and transferability; and (10) Undertake scientific validation of best management practices. These challenges are discussed and critiqued here, to guide future research into riparian vegetation

GIS-based mapping of potential pump storage sites in Norway

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River Classification for Environmental Flow Targets

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Historical Use, Condition, and Revitalization of the bogs of the Erzgebirge

Abstract: According to historical geological maps, the bogs on the German side of the Erzgebirge occupied approx. 6000 hectares at the end of the 19th century. Firstly, for the initial steps of a much needed, up-to-date inventory, a general survey was conducted. After that followed a listing of details within the chosen bogs through a site excursion. At the site of these bogs locations for revitalization projects were suggested. At present, the corresponding measures for these bogs are being planned and carried out.Zusammenfassung: Die Moore auf der sächsischen Seite des Erzgebirges nahmen nach den historischen geologischen Karten zum Ende des 19. Jh. ca. 6000 ha ein. Als erste Stufe für eine bislang fehlende aktuelle Inventarisierung fand eine Übersichtserhebung statt. Es folgte eine Detailerfassung ausgewählter Moore durch Geländebegehungen, aus der Vorschläge für Revitalisierungsstandorte hervorgingen. Derzeit werden in diesen Mooren entsprechende Maßnahmen geplant und umgesetzt.DFG, SUB Göttingen, DGMTresearc

GIS-based mapping of potential pump storage sites in Norway

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Hydromorphological factors, stream power and fish habitat

Foldvik, A., Sundt-Hansen, L., Zinke, P. & Sandlund, O.T. 2016. Hydromorphological factors, stream power and fish habitat. - NINA Kortrapport 2. 20 s. + annexes. Here we report the first steps in an analysis of the potential correlation between specific stream power (SSP) and habitat quality in terms of shelter for juvenile salmonids in Norwegian rivers with anadromous salmonids. The background is that this possibly may be developed into a tool for the classification of ecological status under the EU Water Framework Directive in Norwegian salmon rivers, both rivers in a natural state and those impacted by hydropower regulation. It has previously been shown that the density of juvenile salmon is positively correlated with the amount and quality of shelter in the river substratum. The quality of shelter is influenced by the substra-tum particle size, which is shaped by erosion and sedimentation processes in the river on the background of, e.g., geology and topography in the catchment area. Based on field data from 12 Norwegian rivers with anadromous salmonids, we have analyzed the relationship between SSP and the measured amount of shelter for juvenile fish. In nine of the 12 rivers, there was, as expected, a weak positive correlation. A further development of this model requires more extensive data from a higher number of rivers, and improved quality of the topographic input data.Foldvik, A., Sundt-Hansen, L., Zinke, P. & Sandlund, O.T. 2016. Hydromorfologiske factorer, strømningsenergi og fiskehabitat. - NINA Kortrapport 2. 20 s. + vedlegg I denne rapporten har vi sett på sammenhengen mellom «specific stream power» (SSP, «strømningsenergi», svensk «flödesenergi») og skjul for laksefisk i norske elver. Utgangspunktet for denne tilnærmingen er at dette eventuelt kan utvikles til et verktøy som kan brukes i arbeidet med å gjennomføre vannforskriften for å klassifisere vannforekomster i rennende vann i både regulerte og uregulerte norske lakseelver. Det er dokumentert at tettheten av ungfisk av laks henger sammen med mengde og kvalitet på skjul i elvebunnen. Skjulmulighetene henger igjen sammen med partikkelstørrelsen i substratet, som formes av erosjons- og sedimentasjonsprosesser, gitt bl.a. de geologiske og topografiske forhold i nedbørfeltet. Basert på data for 12 norske lakseelver har vi gjennomført en analyse av SSP i forhold til målt mengde skjul for laksefisk. I ni av disse elvene var det som forventet en svak positiv sammenheng. En videre utvikling av denne modellen vil kreve tilgang på mer omfattende data fra flere elver og forbedret kvalitet på bl.a. topografiske data.© Norsk institutt for naturforskning. Publikasjonen kan siteres fritt med kildeangivelse

Comparing three approaches to estimating optimum white water kayak flows in Western Norway

Background: Modern water management strategies aim to assess the impact of water regulation alternatives on all relevant ecosystem services, including white water (WW) recreation. Therefore it is important to estimate the optimum kayak flow range for river reaches that are potentially relevant for WW kayaking. Methods: We used the grade V run of the Teigdalselva River as an example and compared the results of three different approaches: (i) a hydro-morphological analysis of kayak runs using public data sources; (ii) a citizen science method that is based on photos and videos of kayak-activities on the web; and, (iii) interviews with elite kayakers. Results: For the hydro-morphological analysis, we found that some optimal flow ranges for WW kayak could be estimated based on empirical regional regression as a function of the natural mean flow and the geomorphic run type. The interviewed kayakers suggested a wider range of optimal flows, in particular, higher maxima. The test of the citizen science approach provided flows that ranged in the middle of the estimates made by the two other approaches for prescribing optimum kayak flow ranges. Conclusions: We recommend a combination of different methods for water management studies that are related to flow requirements for white water kayak. Estimations based on the empirical regression functions should be always complemented by at least one other approach