java_waves/groin.html at main · meouda/java_waves · GitHub

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<!-- Mirrored from homepages.cae.wisc.edu/~chinwu/Coastal_Java/groin.html by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 14 Oct 2020 15:22:16 GMT -->
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   <TITLE> CACR Evolution at a Groin</TITLE>
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<img src="cacr.mini.gif" ALIGN="LEFT">
 <P><FONT COLOR="#0000FF"><center><FONT SIZE=+4>
 Shoreline Evolution at a Groin </center></FONT></P>

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<CENTER><P><APPLET code= Groin-2.html archive="groin.jar" width=700 height=220> This application requires a Java-enhanced browser to use.  Sorry.</APPLET></P></CENTER>
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The deposition of sand on the updrift side of  a groin and the subsequent (and antisymmetric) erosion of sand on the downdrift side of a groin can be determined analytically from a one-line contour model.
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The magenta region is the shoreline viewed from above. The vertical black line denotes the groin and the horizontal black line in the center is the original shoreline position.  <p>
The variable <I> width</I>  denotes the width of the figure, and <I>time</I> indicates the elapsed time in days.  The <I>Q</I> shows the area accreted (or eroded) with time.  To determine the impounded sand volume, multiply this amount by (B+h*), where B is the berm height of the beach and h* is the depth of closure. Finally, <I>xm</I> is the distance from the groin to a location where the shoreline displacement (at bypassing) is one hundredth the length of the groin.  This is a measure of the alongshore influence of the groin.
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The animation stops when the groin begins to bypass sand.


 <P><FONT COLOR="#FF0000">Comments: <a href="mailto: [email protected]"> Robert Dalrymple</a></FONT>
 <br>Center for Applied Coastal Research<br>
 University of Delaware, Newark DE 19716<br>USA


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