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sand.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<!-- Mirrored from homepages.cae.wisc.edu/~chinwu/Coastal_Java/sand.html by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 14 Oct 2020 15:22:15 GMT -->
<HEAD>
<TITLE> CACR Sand Transport Calculator</TITLE>
</HEAD>
<BODY bgcolor="#C0C0C0">
<img src="cacr.mini.gif" ALIGN="LEFT">
<CENTER><P><FONT COLOR="#0000FF"><FONT SIZE=+4>
Sediment Transport Calculator</FONT></FONT></P></CENTER>
<CENTER><P>
<HR WIDTH="100%"></P></CENTER>
<CENTER><P><APPLET code= Sand-2.html archive="sand.jar" width=500 height=350> This application requires a Java-enhanced browser to use. Sorry.</APPLET></P></CENTER>
The sediment transport on a shoreline depends on the incident wave waves (height and direction). The shoreline diffusivity is a parameter of use in one-line models of shoreline behavior. (See the Java applets for <a href="oneline.html"> beach fill behavior</a> and the <a href="groin.html">single groin evolution</a>.)
<p>
Here you need to input the breaking wave height and wave angle to determine Q, the longshore sediment transport. There is also an empirical constant K that needs to be supplied. Experiments have shown that K is about 0.7. To also determine G, the shoreline diffusivity, you need to input some geometry of the beach profile--the berm height and the depth of closure (the depth beyond which the profile does not change with time).
<p>
Assumed values: sand porosity = 0.3, specific gravity of sand= 2.65, breaking index = 0.78. To change the output values of Q and G for a different value of porosity (p), multiply the output values by (1-0.3)/(1-p). For a different specific gravity (s), multiply the output by (2.65 - 1)/(s-1).
<p>
The formula used to calculate Q is:
<p>
Q = K E_b *C_b*sin(t)*cos(t)/(rho*g*(s-1)*(1-p)
<br>
where<br>
K is an empirical coefficient, taken as 0.77<br>
E_b wave energy at breaking<br>
C_b group velocity at breaking<br>
t wave angle at breaking<br>
rho density of water<br>
g acceleration of gravity<br>
s specific gravity of sand<br>
p porosity of sand
<P><FONT COLOR="#FF0000">Comments:</FONT><a href="mailto:[email protected]"> Robert A. Dalrymple</a>
</font>
<br>Center for Applied Coastal Research<br>
University of Delaware, Newark DE 19716<br>USA
</BODY>
<!-- Mirrored from homepages.cae.wisc.edu/~chinwu/Coastal_Java/sand.html by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 14 Oct 2020 15:22:16 GMT -->
</HTML>