"Morphodynamic Model for Predicting Beach Changes Based on Bagnold's Concept and Its Applications" by Takaaki Ud

This volume is dedicated to a morphodynamic model (BG model) by applying the concept of the equilibrium slope and the energetics approach, in which depth changes on 2D horizontal grids are calculated.

The authors have developed models for predicting beach changes applicable to various problems on real coasts. One of them is the contour-line-change model to predict long-term beach changes caused by the imbalance in longshore sand transport, which is a kind of N-line model. Because the calculation of the nearshore current is not needed in this model, and the computational load is small, it has an advantage in the prediction of long-term topographic changes on an extensive coast. However, the handling of boundary conditions becomes difficult when offshore coastal structures are constructed in a complicated manner, and in this regard the so-called 3D model has an advantage.


Contents
1.Introductory Chapter: Morphodynamic Model for Predicting Beach Changes Based on Bagnold’s Concept and Its Applications
2.Derivation of the BG Model
3.Eight Types of BG Models and Discretization
4.Prediction of Typical Beach Changes Owing to Human Activities
5.Beach Changes on Coast Subject to Waves and Seaward or Shoreward Strong Currents
6.Formation of Sand Spit and Bay Barrier
7.Interaction of Sandy Islands
8.Formation of Cuspate Foreland
9.Segmentation and Merging of Closed Water Bodies by Wind Waves


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