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David M. Admiraal - One of the best experts on this subject based on the ideXlab platform.

  • B. Reservoir Sedimentation INFLUENCE OF PIPE ANGLE ON BEDLOAD TRANSPORT IN AN INCLINED PIPE
    2015
    Co-Authors: David M. Admiraal
    Abstract:

    A number of Reservoirs in Nebraska have been retrofitted with sediment bypass systems to extend their lifespan. The bypass systems are best suited for rerouting sediment that travels as bedload since bedload is relatively easy to capture at Reservoir Inlets. Because of their size, the captured sediment particles sometimes travel as bedload in the bypass system as well. Studies have been done to quantify head losses in horizontal pipes with different water and sediment flow rates, and the results have been used to assess the practicality of bypass systems for specific prototypes. However, much less has been done to evaluate the performance of inclined pipes for bypassing sediment. Furthermore, little has been done to understand how bedforms influence head losses in the pipes. In order to better understand the behavior of sediment transport within pipes, an experimental apparatus was constructed to simulate a range of sediment loading rates, water flow rates, and pipe inclination angles. Three pressure taps with a spacing of 1.5 m were installed in the pipe at a location sufficiently downstream from the inlet. One section of the pipe was replaced with an acrylic pipe of equivalent internal diameter so that bedform shapes and sizes could be measured for different flow conditions. For each flow condition, the pressure drop in the pipe and the sediment transport rate are recorded over time. For coarse sediment, the inclination angle of the pipe and the sediment transport rate both have a strong influence on flow properties, and, thus, head losses in the pipe

SvaČina Petr - One of the best experts on this subject based on the ideXlab platform.

  • The Composition of Natural Diet of fish in the Lipno Reservoir Inlets
    2011
    Co-Authors: SvaČina Petr
    Abstract:

    This bachelor work is dealing with the composition of natural food of fish in the chosen streams. Many samples were taken from five streams during the spring and autumn seasons at the same area called the Šumava Mountains according to PERLA method. The first two streams are called Hamerský and Pestřice. They are the Inlets of Lipno Reservoir. The next three - Horský, Mlýnský and Bukový belong to the River Danube. Despite of the fact that these streams are situated at the same area and have very similar flows, fish abundancy and the way of farming in their basins differ. These aspects influenced the benthos composition in every single stream and that is why this work should provide survey about the composition and biomass of benthos in particular watercourse. The richest is Mlýnský stream in term of the abundance of benthic organism. By the streams which are parts of basins of Danube river, was the most dominant kind Gammarus Fossarum and Limnius perrisi. By the Lipno Reservoir inflows, there were the most numerous may flies (Ephemeroptera), represented mostly by the tribe Baetis (Hamerský stream) and the Trichoptera kind with the dominant Anomallopterygella chauviniana from the Trichoptera group (Pestřice stream). There are some differences of the composition and abundance of benthic groups between streams belonging to basins of Danube river and the streams influent to Lipno Reservoir. According to the particularity of index number, Lipno?s streams are similar with the streams influent to Danube river from 23% (Pestřice stream) and from 45% (Hamerský stream)