River and Channel Revetments: A Design Manual by Manuela Escarameia

By Manuela Escarameia

This entire handbook presents large info at the different types of revetment on hand and gives assistance at the selection and layout of those platforms. in regards to common and synthetic watercourses info is integrated on revetments that comprise a few kind of structural security and revetments which mix this defense with plants to extend the environmental caliber of the platforms. huge use of pictures, flowcharts and diagrams let the engineer to settle on the main acceptable kind of revetment and the main budget friendly layout.

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13. 1) Dn50 ˆ 0Á34 Hi 0Á5 I sÀ1 r …2:12† where Dn50 is the stone size Hi is the maximum wave height s is the relative density of the material, defined as s/, where s is the density of the stone and  is the density of water Ir is the Iribarren number, which can be taken in the following simplified form tan Ir ˆ  À ÁÃ0Á5 …2Hi †= 1Á3gT2z …2:13† where is the bank slope and g is acceleration due to gravity. Physically, the Iribarren number represents the ratio of the slope of the bank to the steepness of the incident waves.

Differential loads may also be purely external, as is the case of varying water levels, particularly when the levels drop in short periods of time and the base soil and revetment have to respond accordingly. 1). 4. 1. High turbulence In hydraulics, flows are classified into two categories, laminar and turbulent, but most geophysical flows like those occurring in rivers and channels are turbulent. However, the distinction can be made between the levels of turbulence that occur in fairly straight river sections and the higher levels that result predominantly from disturbances to the normal flow pattern.

Excessively high turbulence levels can persist even at considerable distances downstream of the front of the jump, and therefore they should be taken into account when designing bed and bank protection. Downstream of obstructions to the flow such as bridge piers or groynes, the increase in turbulence is not as easy to detect as in a hydraulic jump; sometimes, however, vortices and other flow irregularities can be seen at the water surface. 16. Example of high turbulence downstream of a small weir 36 STABILIT Y OF CHANNEL BED AND BANKS The level of turbulence present in the flow can be measured quantitatively in more than one way, but it is common to define it in terms of turbulence intensity.

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