Silting and Desilting of Reservoirs

Batuca, Dan G.; Jordaan, Jan M.

doi:10.1201/9781003210993

Cited by 19 publications

(7 citation statements)

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“…During consolidation, the flocs rearrange themselves and pore water is expelled, resulting in a denser bed structure (Torfs et al, 1996). A similar behaviour can be seen in the case of settled turbidity currents, which are driven by differences in density and by gravity (Batuca & Jordaan, 2000;Morris & Fan, 1998;Nogueira et al, 2014). Turbidity currents transport large amounts of sediments into lakes, reservoirs and estuaries and may transform into muddy lakes in front of the dam (reservoirs) or often the deepest point (lakes) (e.g., De Cesare, 2006;Schneider et al, 2012).…”

Section: Consolidation Of Deposited Sedimentsmentioning

confidence: 66%

Advanced methods to investigate hydro‐morphological processes in open‐water environments

Haun

Dietrich

2021

Earth Surf Processes Landf

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Hydro‐morphology describes the interactions between water and sediments in fluvial systems and the corresponding processes across all spatial and temporal scales. The results are natural and anthropogenically influenced bed structures and fluvial landforms. However, many of these hydro‐morphological processes cannot be described analytically yet, as a result of their stochastic behaviour and the multitude of processes involved across spatial and temporal scales. Deeper knowledge of these processes is essential, not only for understanding the system itself, but also for practical applications, which rely on correct and reliable investigations of these processes. During the European Geoscience Union (EGU) General Assembly (GA) 2018 in Vienna, Austria, the conveners of the session on “Measurements, monitoring and numerical modelling of sedimentary and hydro‐morphological processes in open‐water environments” had the idea of initiating a special issue, containing a collection of recent achievements in this research field. The aim of this extended introduction is twofold. First, an overview on research needs in investigating hydro‐morphological processes in open‐water environments is given in this article. Second, recently published studies that aim to improve the understanding of hydro‐morphological processes in rivers, lakes and reservoirs by innovative measurement approaches are discussed. In addition to submitted papers collected from the EGU GA in 2017, 2018 and 2019, related studies published in Earth Surface Processes and Landforms (ESPL) over the last two years are also incorporated into this special issue. The papers selected cover a wide range of studies with differing spatial and temporal resolutions. This broad spectrum of different scales clearly indicates the challenges associated with the development and use of advanced methods for investigating hydro‐morphological processes in open‐water environments.

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Section: Consolidation Of Deposited Sedimentsmentioning

confidence: 66%

Advanced methods to investigate hydro‐morphological processes in open‐water environments

Haun

Dietrich

2021

Earth Surf Processes Landf

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“…Or, as could be seen previously, these organic residues, together with their alluvium quantities, participate in mitigating reservoir functions (water supply, hydro-power production, flash flood attenuation capacity, etc.) [56,57]. However, the vegetation contributes to the retention of a great part of these significant quantities of alluvium transported by flash floods, and alluviums that contribute to the evolution/growth of the deltas.…”

Section: Discussionmentioning

confidence: 99%

“…Also, the huge amounts of seasonal vegetation, which rapidly and consistently grow on the substrate of recent sediments and unconsolidated slime, loaded with nutrients, annually increase the amount of organic mud, which contributes to the deterioration of the water quality, accelerating the silting of the lake sector [56,57].…”

Section: Introductionmentioning

confidence: 99%

Identification of Vegetation Surfaces and Volumes by Height Levels in Reservoir Deltas Using UAS Techniques—Case Study at Gilău Reservoir, Transylvania, Romania

Rus,

Șerban,

Brețcan

et al. 2024

Sustainability

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The hydrophilic vegetation from reservoir deltas sustains rapid expansions in surface and important increases in vegetal mass against a background of a significant influx of alluvium and nutrients from watercourses. It contributes to reservoir water quality degradation and reservoir silting due to organic residues. In this paper, we propose an evaluation method of two-dimensional and three-dimensional parameters (surfaces and volumes of vegetation), using the combined photogrammetric techniques from the UAS category. Raster and vector data—high-resolution orthophotoplan (2D), point cloud (pseudo-LIDAR) (3D), points that defined the topographic surface (DTM—Digital Terrain Model (3D) and DSM—Digital Surface Model (3D))—were the basis for the realization of grid products (a DTM and DSM, respectively). After the successive completion of the operations within the adopted workflow (data acquisition, processing, post-processing, and their integration into GIS), after the grid analysis, the two proposed variables (topics) of this research, respectively, the surface of vegetation and its volume, resulted. The data acquisition area (deriving grids with a centimeter resolution) under the conditions of some areas being inaccessible using classical topometric or bathymetric means (low depth, the presence of organic mud and aquatic vegetation, etc.) has an important role in the reservoirs’ depth dynamics and reservoir usage. After performing the calculations in the abovementioned direction, we arrived at results of practical and scientific interest: Cut Volume = 196,000.3 m3, Cut 2D Surface Area = 63,549 m2, Fill Volume = 16.59998 m3, Fill 2D Surface Area = 879.43 m2, Total Volume Between Surfaces = 196,016.9 m3. We specify that this approach does not aim to study the vegetation’s diversity but to determine its dimensional components (surface and volume), whose organic residues participate in mitigating the reservoir functions (water supply, hydropower production, flash flood attenuation capacity, etc.).

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“…Furthermore, existing reservoirs must be adapted to sustainable management practices inasmuch as it is possible [65]. This is why in the 1990s several guidelines relating to sediment management in reservoirs have been released (e.g., [41,41,[66][67][68]). These documents provide specific standards to evaluate the feasibility of different sediment management strategies [69][70][71].…”

Section: Sedimentsmentioning

confidence: 99%

Interdisciplinary Reservoir Management—A Tool for Sustainable Water Resources Management

et al. 2021

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Reservoirs are a common way to store and retain water serving for a multitude of purposes like storage of drinking and irrigation water, recreation, flood protection, navigation, and hydropower production, and have been built since centuries. Today, few reservoirs serve only one purpose, which requires management of present demands and interests. Since each reservoir project will cause negative impacts alongside desired advantages both on a local, regional and global scale, it is even more urgent to develop a common management framework in an attempt to mitigate negative impacts, incorporate different demands and make them visible within the discourse in order to avoid conflicts from early on. The scientific publications on reservoirs are manifold, yet a comprehensive and integrative holistic tool about management of this infrastructure is not available. Therefore, a comprehensive and integrated conceptual tool was developed and proposed by the authors of this paper that can contribute to the sustainable management of existing reservoirs. The tool presented herein is based on the results from the interdisciplinary CHARM (CHAllenges of Reservoir Management) project as well as the condensed outcome of relevant literature to aid and enhance knowledge of reservoir management. The incorporated results are based on field, laboratory and empirical social research. The project CHARM focused on five different aspects related to existing reservoirs in southern Germany (Schwarzenbachtalsperre, Franconian Lake District), namely: sedimentation of reservoirs, biostabilisation of fine sediments, toxic cyanobacteria(l) (blooms), greenhouse gas emissions from reservoirs and social contestation, respectively consent. These five research foci contributed to the topics and setup of a conceptual tool, put together by the research consortium via delphi questioning, which can be found alongside this publication to provide insights for experts and laymen. Conceptualising and analysing the management in combination with quantitative and qualitative data in one descriptive tool presents a novelty for the case studies and area of research. The distribution within the scientific community and interested public will possibly make a positive contribution to the goal of sustainable water resources management in the future.

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Silting and Desilting of Reservoirs

Cited by 19 publications

References 0 publications

Advanced methods to investigate hydro‐morphological processes in open‐water environments

Advanced methods to investigate hydro‐morphological processes in open‐water environments

Identification of Vegetation Surfaces and Volumes by Height Levels in Reservoir Deltas Using UAS Techniques—Case Study at Gilău Reservoir, Transylvania, Romania

Interdisciplinary Reservoir Management—A Tool for Sustainable Water Resources Management

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