Energy Loss in Steep Open Channels with Step-Pools

Sediment transport in steep channels with large roughness elements

Most sediment transport equations overestimate the bedload transport rate by several times when applied to mountain rivers. This is due to the fact that the presence of large relatively immobile boulders, which disrupt the flow, is generally not taken into account. Sediment transport in steep channels with boulders was herein investigated using 41 laboratory experiments carried out on a tilting...

Manning Friction in Steep Open-channel Flow

The Manning friction coefficient as a one-dimensional (1D) openchannel flow parameter is determined from a series of two-dimensional (2D) simulations of the flow on steep slopes using a computational hydraulic solver derived from a minimal intervention strategy (MIS2D). Computations are also conducted for the oblique dam-break waves to evaluate the performance of MIS2D. The results are compared...

Open Information Pools

Minimum Specific Energy and Critical Flow Conditions in Open Channels

In open channels, the relationship between the specific energy and the flow depth exhibits a minimum, and the corresponding flow conditions are called critical flow conditions. Herein they are reanalyzed on the basis of the depth-averaged Bernoulli equation. At critical flow, there is only one possible flow depth, and a new analytical expression of that characteristic depth is developed for ide...

Loss of algicidal chemicals in swimming pools.

An interest in the field of algicides for swimming pools has led to a survey of the problems involved in this field. A study of the bactericidal and algicidal properties of some of the chemicals used has been reported (Fitzgerald, 1959) in which it was pointed out that some of the products available show remarkable properties in laboratory tests. The present studies demonstrate how the activity...