online_scour_froehlich1988:  Calculation of pier scour using the Froehlich (1988) formula   

Formula:

Fr1 = v1 / (g y1)1/2

ys = 0.32 b φ Fr10.2 (be / b)0.62 (y1 / b)0.46 (b / D50)0.08 + b

[ SI units (metric):  ys, y1, and b in m; v1 in m/s; D50 in mm ]
[ U.S. Customary units:  ys, y1, and b in ft; v1 in ft/s; D50 in mm ]
[ Fr = Froude number; g = gravitational acceleration ]

Reference

INPUT DATA:      [Description]     [Sample Input]

Select:      

Flow depth y1 :      

 
Warning: Undefined variable $flowdepthunits in /var/www/html/ponce/onlinescourfroehlich1988.php on line 250

Flow velocity v1 :      

 
Warning: Undefined variable $flowvelocityunits in /var/www/html/ponce/onlinescourfroehlich1988.php on line 256

Pier width b :      

 
Warning: Undefined variable $pierwidthunits in /var/www/html/ponce/onlinescourfroehlich1988.php on line 262

Angle of attack θ of the flow (degrees):      

 
Warning: Undefined variable $angleofattackunits in /var/www/html/ponce/onlinescourfroehlich1988.php on line 270

Median diameter of bed material D50 :      

 
Warning: Undefined variable $dfiftyunits in /var/www/html/ponce/onlinescourfroehlich1988.php on line 276

Pier nose shape:      

OUTPUT:


Warning: Undefined variable $unitsystems in /var/www/html/ponce/onlinescourfroehlich1988.php on line 309
System of units:  SI units (metric)


Warning: Undefined variable $piernoseshape in /var/www/html/ponce/onlinescourfroehlich1988.php on line 326
Pier nose shape:  Square nose

♦  Scour depth ys :   
Warning: Undefined variable $scourdepth in /var/www/html/ponce/onlinescourfroehlich1988.php on line 352

Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/ponce/onlinescourfroehlich1988.php on line 352
 
Warning: Undefined variable $flowdepthunits in /var/www/html/ponce/onlinescourfroehlich1988.php on line 352

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