Skip to main content
Geosciences LibreTexts

9.8.2: Accretion of new land

  • Page ID
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)

    截屏2021-12-08 下午10.24.34.png
    Figure 9.36: Accretion of new land (crosses: initial situation, open dots: new equilibrium). From Eqs. and it can be seen that a change in the prism has a larger effect on the equilibrium channel volume than on the equilibrium volume of the outer delta, such that \(a - b > 0\)

    Natural accretion along the borders of the basin, due to the deposition of silt is a very slow process. This process causes a gradual reduction of the tidal prism, see Fig. 9.36. Due to this reduction the channel volume is \(a\ m^3\) too large and the sand volume of the ebb-tidal delta is \(b\ m^3\) too big. This results in a sand demand from outside. Also in this case not all the sand can be supplied from the outer delta and this will be at the expense of the downdrift coast.

    This page titled 9.8.2: Accretion of new land is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by Judith Bosboom & Marcel J.F. Stive (TU Delft Open) via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.