Scour Technology (McGraw-Hill Civil Engineering) by George W. Annandale

By George W. Annandale

Buildings inbuilt or close to rivers and different channels may be liable to scour round their foundations. If the intensity of the scour turns into major, the soundness of the principles could be endangered, with a consequent threat of wear or failure of the constitution. there were numerous bridge disasters, leading to delivery disruption, financial loss and, occasionally, demise. the criteria influencing scour are complicated and differ based on the kind of constitution. defense for combating scour should be designed to resist the movement forces imposed on them and feature to be useful to construct and set up, whereas minimizing antagonistic environmental results. This booklet covers the total Scour expertise sector and is ready by means of one of many major specialists at the topic.

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The indicator parameters currently used in practice include shear stress, average flow velocity, and stream power. It is shown further on that current methods to quantify these indicator parameters do not provide consistent trends when used to quantify the relative magnitude of the erosive capacity of water. This shortcoming presents engineers with a significant practical problem. An attempt to address this problem is made by examining the essential nature of flow processes that leads to scour.

This has been demonstrated at the spillway outlet of Ricobayo Dam, Spain. In the early 1930s when this dam was built knowledge to assess the erodibility of rock was lacking. The design called for the water from the spillway to be released onto bare rock as shown in the photograph of the physical hydraulic model study (Fig. 10). Once built, it was found that the rock was not strong enough to resist the erosive capacity of the water. 11 shows the scour of rock that occurred within the first 19 days of operation of the spillway at the end of 1933 and the beginning of 1934.

22 Chapter Two Summary The most important elements of the decision-making process, as far as engineering decision-making is concerned, are objective and subjective reasoning, and synthesis. The basis for objective reasoning is the quantitative results originating with analytical and numerical investigations, and from physical model studies, should these be executed. Subjective reasoning is largely based on experience, the use of probability theory and uncertainty analysis, one’s existing knowledge base, research (one’s own or that of others) and, what can simply be described as, reflection.

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