Debris flow : mechanics, prediction, and countermeasures by Tamotsu Takahashi PDF

By Tamotsu Takahashi

ISBN-10: 0203576748

ISBN-13: 9780203576748

ISBN-10: 1138000078

ISBN-13: 9781138000070

ISBN-10: 1306502519

ISBN-13: 9781306502511

This is the second variation of 1 of the main finished money owed of particles stream, describing either theoretical and utilized points. within the first half, the elemental mechanical features are mentioned, together with stream features, sort category, mechanics, prevalence and improvement, absolutely constructed stream, and deposition strategies. the second one half sheds mild at the software of the theories offered in computer-simulated reproductions of actual mess ups. distinctive awareness is paid to mess movement controlling constructions, layout effectiveness and function, smooth countermeasure difficulties, equivalent to the id of particles circulate services ravines and the prediction of prevalence via precipitation threshold. This re-creation has been entirely revised and up-to-date, and now incorporates a new bankruptcy on sediment runoff types that come with particles move tactics and new sections pertaining to landslides.

The qualitative and basic personality of this article makes it a good textbook for graduate-level classes and it's endorsed analyzing for execs in engineering, geosciences and water assets who're engaged on the mechanics and countermeasures of particles move. the unique, jap model of this booklet was once offered the ‘Publishing tradition Prize’ by means of the japanese Society of Civil Engineers (2004).

Tamotsu Takahashi is Professor Emeritus on the collage of Kyoto. as well as his educational positions, he's the Director of the organization for catastrophe Prevention learn in Kyoto. Professor Takahashi begun his profession in flood dynamics learn, and more and more serious about particles circulation and flood dangers. He has been honoured with numerous awards from the Japan Society of Civil Engineers and the Japan Society of abrasion keep an eye on Engineering. An past ebook entitled ‘Debris Flow’, by way of Tamotsu Takahashi, within the booklet sequence of the foreign organization of Hydraulic Engineering and examine, was once released by means of Balkema Publishers, now part of the Taylor & Francis Group.

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Sample text

The flood flow erodes the smoothened bed. Therefore, after one event, the channel bed returns to be as rugged as before. But, the elevation of the bed, the width of the channel and the longitudinal shapes of the side banks are not necessarily the same as those before the event. The existing statistics show that the duration of one event is from a few tens of minutes to several tens of hours and the most frequent one is about two hours. About 70% of the duration is the continuation of intermittent surges (Kan 1994).

However, the existing discrete element models that are suitable for discussing individual particle motion cannot treat solid-fluid interaction well, and more importantly, they cannot predict the macro behaviors practically required. At present, the continuum mixture theory that divides the constituent into the continuum solid phase and the continuum fluid phase taking the interaction between the phases strongly into account is the most influential. This chapter first outlines the physical methods to discuss the motion of a solid and fluid mixture.

Then, the numbers of surges repeatedly pass. 3 t/m3 . Occasionally, intermittency suddenly ceases in this stage and a continuous turbulent flow appears for a while, but it is followed again by the intermittent flows. This phenomenon may be caused by the supply condition of the debris flow material in the source area, but it cannot be said definitely. In general, after the repetition of intermittent surges, in a reverse of the developing process, it appears a continuous turbulent debris flow followed by the hyper-concentrated flood flow.

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Debris flow : mechanics, prediction, and countermeasures by Tamotsu Takahashi

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