Session D1: Classification of Flow Patterns in a Nature-Oriented Fishway Based on 3D Hydraulic Simulation Results

Abstract: In order to fulfill the requirements of the EU Water Framework Directive concerning the restoration of fish passage in rivers, various types of (near-natural and technical) fishways have been built in recent years. For optimization of planned structures as well as for monitoring of the performance of existing fishways, their hydraulics has to be studied. 3D hydrodynamic numerical modelling is a useful tool to predict hydraulic quantities and analyse flow pattern. Many studies using hydraulic simulations deal with technical fishways. In contrast, nature-oriented fishways have rarely been numerically modelled so far. In the framework of R&D activities at Karlsruhe Institute of Technology, a high resolution 3D-hydraulic model of a section of a nature-oriented bypass channel (rock cascade pass) has been developed. The basis of a hydraulic model is a 3D-model of the fishway’s topography. Since fishways of a nature-oriented design type are characterized by highly irregular structures, the build-up of such a model is very challenging. In this study, the method of terrestrial laser scanning was used for detailed geodata acquisition. The hydraulic model was validated using, inter alia, acoustic Doppler velocity measurements. Simulations using the computational fluid dynamics software FLOW-3D were performed for two hydraulic scenarios. The simulated hydraulic quantities (velocities, water levels) and their distribution along the vertical and horizontal axes have been investigated and compared to critical values concerning fish passability specified in technical standards. A method of categorization of flow patterns is proposed, which enables a schematic visualization of complex flow conditions. In this way, potentially critical zones can be located and specific flow patterns can be identified. This method of analysis has a high potential in terms of addressing environmental issues concerning nature-oriented fishways and river restoration projects

Radiation induced nucleation in water and organic liquids.

Massachusetts Institute of Technology. Dept. of Nuclear Engineering. Thesis. 1972. M.S.Includes bibliographical references.M.S

Development of Underground Water Extraction System for Karst Regions with Adapted Technologies and Operating System – Pilot Plant in Java, Indonesia

AbstractIn many developing countries, despite of much national and international effort to improve the water supply situation, the technical and ecological as well as economical solutions are still insufficient. The situation in karst regions is even more severe due to the extreme climatic and hydrogeological conditions. In karst areas, a large percentage of the precipitation rapidly infiltrates from the surface into the karst rock. The water resources are therefore mainly stored in the karst aquifers as well as in underground river systems. Because of lacking storage possibilities on the surface, bad accessibility of the underground resources and often long running dry seasons, serious water shortages occur. Against this backdrop, an interdisciplinary research group of the Karlsruhe Institute of Technology (KIT), together with industry partners, concentrates intensively on the development and implementation of concepts and technologies for an adapted water resources management in karst regions of Southeast Asia. This paper focuses on the Indonesian-German joint project for the development of an underground hydropower pilot plant in a karst region on Java, Indonesia, which is, from German side, supported by the German Federal Ministry of Education and Research (BMBF). After years of research and construction works facing several setbacks due to earthquakes and flood events, since mid of 2011 the plant is operated continuously under the responsibility of an Indonesian operational team

Run-time Support for Real-Time Multimedia in the Cloud

REACTION 2013. 2nd International Workshop on Real-time and distributed computing in emerging applications. December 3rd, 2013, Vancouver, Canada.This paper summarizes key research findings in the area of real-time performance and predictabil- ity of multimedia applications in cloud infrastruc- tures, namely: outcomes of the IRMOS European Project, addressing predictability of standard vir- tualized infrastructures; Osprey, an Operating Sys- tem with a novel design suitable for a multitude of heterogeneous workloads including real-time soft- ware; MediaCloud, a novel run-time architecture for offering on-demand multimedia processing facil- ities with unprecedented dynamism and flexibility in resource management. The paper highlights key research challenges ad- dressed by these projects and shortly presents ad- ditional questions lying ahead in this area

Session D4: Hybrid Model Approach for Designing Fish Ways - Example Fish Lift System at Baldeney/Ruhr and Fish Way at Geesthacht /Elbe

Abstract: Within the context of designing a fish passage, engineers and planers are provided with numerous standardized constructions methods including the respective assessment criteria to ensure that fish are able to migrate at transverse structures. Due to individual spatial conditions and boundaries, there is a need for special constructions at various locations. Because of lack of design specifications or lack of monitoring experience in the planning stage, the functionality of new systems and construction methods is not proven. Comprehensive functionality tests are therefore to be implemented. At the Baldeney weir an innovative fish lift is currently planned. The required system optimization and the verification of functionality were carried out on behalf of the Ruhrverband in a hybrid model approach, where physical and numerical models as well as ethohydraulic tests were linked. On the basis of a high resolution 3D flow model and a physical model in a 1:3 scale, the flow behaviour within the fish lift and its components was analysed and optimized for different geometrical scenarios taking fish biological limits into account. The optimized geometry of the fish lift system was then placed into a situational similar model with a functional module of the fish lift and studied furthermore by using ethohydraulic tests. With the ethohydraulic tests, all phases of the fish passage (entry, lift passage and exit) could be examined with different fish species at different ages The applied methodology and the effectiveness of the hybrid model approach within the context of planning a fish passage is illustrated by results of the conducted studies for the fish lift system at Baldeney and the fish passage in Geesthach