Read e-book online Defence from Floods and Floodplain Management PDF

By Vujica Yevjevich (auth.), John Gardiner, Ödön Starosolszky, Vujica Yevjevich (eds.)

ISBN-10: 9401041792

ISBN-13: 9789401041799

ISBN-10: 9401104018

ISBN-13: 9789401104012

Defence from Floods and Floodplain Management discusses all elements of floodplain administration relating to defence from floods, together with particular matters comparable to the upkeep of flood defences, and divulges many points of a extra holistic method of the administration of flood threat, increasing the structural/non-structural debate into prevention and remedy within the floodplain and its catchment. contemporary adventure in lots of international locations is stated through specialists from Hungary, Austria, Greece, Italy, the Netherlands, Portugal, the united kingdom and the USA.

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Extra resources for Defence from Floods and Floodplain Management

Sample text

Figure 1. Channel development during the 1983 EI Nino Flood, Piura River in Peru. 3. FEEDBACK BETWEEN OBJECTIVES AND TECHNOLOGY By itself, the size of rivers limits the choice of technology: structures must be simple, inexpensive per unit length and resistant to adverse influences. Changes in the technology and economy of construction have modified river engineering works through the ages. The objectives strongly interact with the technological means. The best example is the development of waterways: navigation requirements grow as the technological means One of the practical experiences concerns flood insurance: in order to avoid possible disputes, the policy should preferably state the return period of the flood event without specifying its cause as the peak discharge or peak water level.

2), a method held to be strongly objectionable not so long ago (Knight, 1990). If the main channel meanders strongly, the direction of flow in the main channel deviates strongly from that over the floodplain (Fig. 3). This situation can best be approached by scale models, as simplifications into ID or even 2D models would essentially depart from the 3D reality. Figure 2. Conveyance calculation by subsections Figure 3. Flow over a meandering river reach during floods 47 Channel Resistance. In hydraulic calculations, the energy losses (originating from boundary friction, eddies caused by channel irregularity, solid particles), are lumped together into a friction term, which depends, among others, on the kind of bed material and modes of sediment transport (Grishanin, 1983).

For instance, by reducing the length of the Greater Morava River in Serbia from 220 to 140 kilometres, the frequency of floods and the costs of flood protection works (embankments and dikes) were considerably reduced, without causing major erosion. 4. Channel Correction to Facilitate Ice Drift The worst winter floods on many rivers were caused by barriers of accumulating ice. Thus, important river training works have been carried out in order to correct channel constrictions and sharp bends, which hinder ice drift.

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Defence from Floods and Floodplain Management by Vujica Yevjevich (auth.), John Gardiner, Ödön Starosolszky, Vujica Yevjevich (eds.)


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