Spatial and temporal patterns of sedimentation in an infilling reservoir

Palinkas, C. M.; Russ, Emily

doi:10.1016/j.catena.2019.04.024

Cited by 19 publications

(3 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sediment deposition in reservoirs has been studied more intensively than sediment erosion or reworking. The spatial pattern of sediment deposition is difficult to predict, with huge impacts of hydrological events [4,9] and different depositional patterns at shorter and longer timescales [9]. Prograding deltas contain most the sediments transported by tributary streams [1,4,10].…”

Section: Introductionmentioning

confidence: 99%

“…Prograding deltas contain most the sediments transported by tributary streams [1,4,10]. Under low flow conditions, the most common process is deposition in stepwise prograding deltas along with the incision of submerged channels, which results in a long-term increase in near-dam deposition [4,9,11]. Erosion, including slumps in the inflow delta front, channel, and gully erosion in delta tops, and subaerial and subaquatic bank instabilities, is typically more spatially heterogeneous than deposition [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic

Pacina

Lenďáková

Štojdl

et al. 2020

IJGI

View full text Add to dashboard Cite

A wide variety of geographic information system tools and methods was used for pre-dam topography reconstruction and reservoir bottom surveying in two dam reservoirs in the Ohře River, Czech Republic. The pre-dam topography was reconstructed based on archival aerial imagery and old maps. The benefits and drawbacks of these methods were tested and explained with emphasis on the fact that not all processed archival data are suitable for pre-dam topography modeling. Bathymetric surveying of a reservoir bottom is presently routine, but in this study, we used a wide combination of bathymetric mapping methods (sonar, ground penetration radar, and sub-bottom profiler) and topographic survey tools (LiDAR and photogrammetry), bringing great benefits for bottom dynamic analysis and data cross-validation. The data that we gathered made it possible to evaluate the formation of the inflow deltas in the reservoirs studied and assess the sediment reworking during recent seasonal drawdowns. A typical inflow delta was formed in the deeper of the two studied reservoirs, while the summer 2019 drawdown caused the formation and incision of a temporary drawdown channel and erosive downstream transport of approximately 1/10 of the delta body thickness in approximately 1/10 of the delta transverse size. No inflow delta was formed in the shallower of the studied reservoirs, but unexpectedly extensive sediment reworking was observed in the inflow part of the reservoir. Both the studied reservoirs and the pre-dam river floodplain have accumulated historical contamination by risk elements such as As, Hg, Pb; thus, the enhanced erosion of existing sediment bodies expected in the future, owing to more frequent droughts and global climate change, will endanger the ecological quality of the water and solids outflowing from the reservoirs.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic

Pacina

Lenďáková

Štojdl

et al. 2020

IJGI

View full text Add to dashboard Cite

show abstract

“…Estimating the volume of lake sediment infill and its temporal changes is a common, albeit often difficult (cf. Anselmetti et al, 2007; Palinkas and Russ, 2019; Wang et al, 2019), task in palaeogeographical and limnological studies. Until now, estimations have relied on the combination of hypsometric measurements with drilling or probing of sediments on the lake bottom.…”

Section: Introductionmentioning

confidence: 99%

Landslide‐dammed lake sediment volume calculation using waterborne ERT and SONAR profiling

Hartvich

Tábořík

Šobr

et al. 2020

Earth Surf Processes Landf

View full text Add to dashboard Cite

Lake sediment volume calculation is a challenging task, namely in cases when detailed drilling is complicated, expensive, or impossible, information on the pre-sedimentation surface unavailable, and record of siltation rate non-existent or too short. This study shows how waterborne, non-invasive geophysical survey, such as electrical resistivity tomography (ERT) can be very effective in acquiring the missing data, namely when combined with sound navigation ranging (SONAR) water depth measurements and supported by information from auxiliary sources. However, ERT surveying in water environment requires specific approaches, as we illustrate on the case of the Mladotice lake study. The lake was created after a landslide in May 1872, and since its formation, the depth has gradually decreased due to sedimentation. We have reconstructed the original surface, calculated the sediment volume, and compiled information on sedimentation to estimate its remaining life span. To achieve this, we measured nine waterborne ERT profiles across the lake. To reach the necessary depth, all ERT profiles were extended on land and crossed the lake using custom-built flotation pads. ERT profiling was combined with SONAR depth measurements, historical bathymetric surveys, borehole core analysis, sediment flux measurements, volumetric calculations, and water conductivity probing. The study has achieved three main results. First, practical applicability and advantages of stationary waterborne ERT profiling in combination with bathymetric sounding were demonstrated. Second, the original lake volume and accumulated sediment was calculated. We estimate that the volume of lake sediment is 187000 m 3 , two-thirds of the original lake volume (over 275000 m 3). Finally, based on three volumetric data sets from 1972, 2003, and 2017, and recent monitoring of the sediment inflow, we propose scenarios of lake filling and its future development. Most interestingly, the sedimentation rate has decreased significantly in the last 20years, suggesting that the lake may survive much longer than hitherto expected.

show abstract

Mesocosm approaches to the examination of benthic–pelagic coupling, with emphasis on turbulence

Porter,

Cornwell

2023

Limnology & Oceanography

View full text Add to dashboard Cite

Benthic and pelagic processes are closely coupled in shallow‐water estuarine and marine environments and in lakes yet benthic–pelagic coupling is difficult to simulate in mesocosms. Realistic water column (WC) and bottom turbulence often are not simultaneously mimicked in mesocosm experiments, leading to artifacts and omitting direct and indirect linkages and feedbacks between the sediment and the WC. The information on benthic–pelagic coupling mesocosm studies assembled illustrates the importance of realistic physics in mesocosms. Mesocosm approaches including both WC turbulence and bottom turbulence that are appropriately designed to resemble natural conditions can provide a deeper mechanistic understanding of feedback processes associated with biogeochemical, food web, and the habitat shifts necessary for models, and will help identify cause‐and‐effect relationships. Benthic–pelagic mesocosm experiments with realistic WC and bottom turbulence may fill the large gaps in our understanding of the responses of inorganic nutrient and organic matter fluxes between benthic habitats and the WC. Future applications of such benthic–pelagic coupling mesocosm studies are outlined.

show abstract

Spatial and temporal patterns of sedimentation in an infilling reservoir

Cited by 19 publications

References 79 publications

Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic

Dynamics of Sediments in Reservoir Inflows: A Case Study of the Skalka and Nechranice Reservoirs, Czech Republic

Landslide‐dammed lake sediment volume calculation using waterborne ERT and SONAR profiling

Mesocosm approaches to the examination of benthic–pelagic coupling, with emphasis on turbulence

Contact Info

Product

Resources

About