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Probabilistische Bemessung der Deckschichten von Strombauwerken an SeeSchStr (ProbBem). FuE-Abschlussbericht B3955.01.04.70234
No full textZum Einfluss von Grundwasserhaltungsmaßnahmen auf Mitnahmeeffekte von baulichen Anlagen anhand von Praxisbeispielen in Frankfurt
No full textInnovative quay wall surveys – leveraging unmanned surface vehicles
No full textRegular surveys of quay walls ensure they remain structurally sound and operational, but traditional inspection methods can be labour-intensive and limited by ac+T39cess constraints. However, new approaches that leverage autonomous technologies are advancing the field in terms of operational efficiency on the water, data quality and the extent to which 3D models can be created and applied for engineering and maintenance purposes. Subsea Europe Services GmbH has been working on a solution based on the integration of a tilted multibeam echo sounder (MBES) mounted on an unmanned surface vehicle (USV). It was put to the test this summer in the »Alter Hafen Süd« port in Rostock, Germany, during a successful quay wall survey that demonstrated how the combination of cutting-edge acoustic and autonomous systems can significantly enhance surveying and analysis in complex harbour environments
From seasonal field study to surrogate modeling: Investigating the biomechanical dynamics of Elymus sp. in salt marshes
No full textSalt marshes have been studied in the context of ecosystem services they can provide for coastal protection. In this study, monthly field campaigns focusing on Elymus spp. and its biomechanical properties were conducted from December 2021 to December 2022 on the German Barrier Island Spiekeroog. A total of 1390 specimens were investigated to determine their growth length, out of which 418 specimens were investigated mechanically with three-point bending tests to determine their biomechanical properties. To evaluate the interaction of hydraulic loads and vegetation, the challenge of modeling biomechanical plant properties to scale is addressed by using resin 3D printing with flexible material, while focusing on the materials mechanical properties. Based on the field data acquired and additional literature (adding up to 1959 measurements), a cylindrical plant model with an outer diameter of (scale 1 : 1) was developed. It was manufactured mixing two resin components with varying volume ratios resulting in surrogates with different flexural stiffnesses. The surrogates were characterized using three-point bending tests and image analysis of their bending behavior when subjected to currents between 0.4 and 1.2 m/s. With the average Young's modulus ranging from 8.45 to 1708.42 MPa, the bending angle varies from 0° to 77.4° displaying the influence of material stiffness and flow velocity. Applying the Cauchy scaling law, this study shows that resin 3D printing can be used to model Elymus sp. with respect to its biomechanical properties allowing for seasonally independent physical laboratory experiments with plant models
Nicht zu schnell und nicht zu langsam: Ethohydraulische Untersuchungen zur Analyse und Ableitung von Bemessungsempfehlungen für Fischaufstiegsanlagen
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Bouchures gonflables, comment les concevoir, comment les exploiter
No full textAusatztitel englisch: Rubber gates, how to design and to operate them;
Infos zur Konferenz: https://www.barrages-cfbr.eu/2024-Colloque-Vantelleri
Tide-Laufzeitverschiebung zur Optimierung von Befliegungen
No full textDokument erstellt im Zusammenhang mit Projekt TrilaWatt
Zusammenfassung: Die Vermessung von Topographie mittels Laserscanbefliegung (ALS) ist eine etablierte und effiziente Methode zur großflächigen Erfassung von Höhendaten mit hoher Genauigkeit. Im deutschen Wattenmeer wird ALS häufig zur Vermessung der topographischen Höhen im Wattenmeer eingesetzt, z. B. bei jährlichen Messkampagnen im Bereich der Außenelbe. Die Vermessung unterhalb der Wasseroberfläche ist für Laserscanmessinstrumente jedoch herausfordernd aufgrund von Trübung im Wasser. Daher erbringen beflogene Höhenvermessungen insbesondere auf vorübergehend trockenen Gebieten wie beispielsweise Watt oder Salzmarschen die besten Ergebnisse. Um die räumliche Abdeckung einer Befliegung zu maximieren, wurden in diesem Use-Case die räumlich variablen Eintrittszeiten des Tideniedrigwassers aus numerischen Modelldaten abgeleitet, um so die Planung einer Befliegungsroute auf minimale Wasserstände zu optimieren