We consider shallow water flows through a channel with a contraction by experimental and theoretical means. The horizontal channel consists of a sluice gate and an upstream channel of constant width b0 ending in a linear contraction of minimum width bc. Experimentally, we observe upstream steady and moving bores/shocks, and oblique waves in the contraction, as single and multiple steady states,...

We introduce a Cooper pair "sluice" for the implementation of a frequency-locked current source. The device consists of two mesoscopic SQUIDs and of a single superconducting island with a gate. We demonstrate theoretically that it is possible to obtain a current as high as 0.1 nA at better than ppm accuracy via periodically modulating both the gate charge and the effective Josephson coupling. W...

Abstract The Yellow River diversion project consists of three gates, two pumping stations, and one plain reservoir, with a total river length 17.46 km in the Panzhuang irrigation area, which provides primary water source for Dezhou central city, Shandong Province, China. is subject to constraints sluice diverting time, reservoir combinations stations self-flowing gates. opening closing forms ga...

in order to evaluate the ecological potential for assessing the ecotourism application a region was confined to dez river. mcharg method and networks method were applied. according to makhdoum’s method, to determine environmental units, the ecological resources of the region were surveyed. then evaluation of the ecological potential was carried out on the basis of ecotourism and qualified regio...

A system using totally disposable self-supporting bedpans requiring no carrier was examined in use in two hospitals. The bedpans and their contents were disposed of by destruction and flushing to waste carried out in a modified Haigh Sluicemaster disposal unit. This incorporates a positively closing and locking lid with refinements to avoid the lid slamming and has effective safety devices. The...

A five year project was undertaken to address the salinity problem in upstream of Baleswar river. The information generated during this period have been presented paper. Previously Madhumati-Baleswar river system completely non saline throughout year. Recently fresh water flow from Madhumati through passing between Chitalmari and Nazirpur Upazila is about cease due prolonged siltation on bed. D...

China is in the stage of rapid urbanization, resulting more and serious urban waterlogging problems. Based on TELEMAC-2D hydrodynamic model, this paper conducted mathematical modeling Swan Lake flood storage detention area Dongying City, simulated inflow inundation process under three rainfall scenarios typhoon “Rumbia”, “Lekima” 50-year return period. The simulation results show that when wate...

Hydraulic jumps have immense practical utility in hydraulic engineering and allied fields, such as energy dissipater to dissipate the excess energy of flowing water downstream of hydraulic structures (spillways and sluice gates), efficient operation of flow measurement flumes, chlorinating of wastewater, aeration of streams which are polluted by biodegradable wastes and many other cases. The le...