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In situ measurements of fine sediment infiltration (FSI) in gravel‐bed rivers with a hydropeaking flow regime
Earth surface processes and landforms, 2019-02, Vol.44 (2), p.433-448
Hauer, Christoph
Holzapfel, Patrick
Tonolla, Diego
Habersack, Helmut
Zolezzi, Guido
2019
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Hauer, Christoph
Holzapfel, Patrick
Tonolla, Diego
Habersack, Helmut
Zolezzi, Guido
Titel
In situ measurements of fine sediment infiltration (FSI) in gravel‐bed rivers with a hydropeaking flow regime
Ist Teil von
Earth surface processes and landforms, 2019-02, Vol.44 (2), p.433-448
Ort / Verlag
Bognor Regis: Wiley Subscription Services, Inc
Erscheinungsjahr
2019
Quelle
Wiley Online Library
Beschreibungen/Notizen
The overpresence of fine sediment and fine sediment infiltration (FSI) in the aquatic environment of rivers are of increasing importance due to their limiting effects on habitat quality and use. The habitats of both macroinvertebrates and fish, especially spawning sites, can be negatively affected. More recently, hydropeaking has been mentioned as a driving factor in fine sediment dynamics and FSI in gravel‐bed rivers. The primary aim of the present study was to quantify FSI in the vertical stratigraphy of alpine rivers with hydropeaking flow regimes in order to identify possible differences in FSI between the permanently wetted area (during base and peak flows) and the so‐called dewatering areas, which are only inundated during peak flows. Moreover, we assessed whether the discharge ratio between base and peak flow is able to explain the magnitude of FSI. To address these aims, freeze‐core samples were taken in eight different alpine river catchments. The results showed significant differences in the vertical stratification of FSI between the permanently wetted area during base flow and the dewatering sites. Surface clogging occurred only in the dewatering areas, with decreasing percentages of fine sediments associated with increasing core depths. In contrast, permanently wetted areas contained little or no fine sediment concentrations on the surface of the river bed. Furthermore, no statistical relationship was observed between the magnitude of hydropeaking and the sampled FSI rate. A repeated survey of FSI in the gravel matrix revealed the importance of de‐clogging caused by flooding and the importance of FSI in the aquatic environment, especially in the initial stages of riparian vegetation establishment. © 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd. The over presence of fine sediment and fine sediment infiltration (FSI) in the aquatic environment of rivers are of increasing importance due to their limiting effects on habitat quality and use.
Sprache
Englisch
Identifikatoren
ISSN: 0197-9337
eISSN: 1096-9837
DOI: 10.1002/esp.4505
Titel-ID: cdi_proquest_journals_2176087645
Format
–
Schlagworte
Alpine environments
,
alpine rivers
,
Aquatic environment
,
Base flow
,
Catchment area
,
Catchments
,
Clogging
,
Cores
,
Density stratification
,
Dewatering
,
Dynamics
,
Earth
,
Earth surface
,
fine sediments infiltration
,
Fish
,
Flooding
,
Fluvial sediments
,
Gravel
,
hydropeaking
,
hydropower
,
In situ measurement
,
Infiltration
,
Landforms
,
Macroinvertebrates
,
Riparian environments
,
Riparian vegetation
,
River beds
,
River catchments
,
Riverbeds
,
Rivers
,
Sediment
,
Sediment concentration
,
Sediment dynamics
,
sediment management
,
Sediments
,
Spawning
,
Statistical analysis
,
Statistical methods
,
Stratification
,
Stratigraphy
,
Surveying
,
Vegetation establishment
,
Vertical distribution
,
Zoobenthos
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