tractive force method of channel design, open-channel hydraulics, Victor Miguel Ponce, San Diego State University <style> a {text-decoration:none} a:hover {color: #cc0000; background: #00ee00; text-decoration: none} </style> </head> <body bgcolor="227711" link="880000" vlink="990000" alink="aa0000"> <P><br><P><br> <center><table width="60%" border="2" bgcolor="ffffee" bordercolor="000066" cellpadding="30"><tr><td> <CENTER><font face="helvetica" color="aa0000" size="+1"><B>♦ ONLINE TRACTIVE FORCE ♦</B></font></CENTER> <br> <hr size="2" color="000066"><center> <P><table cellpadding="0" align="center" width="100%"><tr><td valign="bottom"> <table cellpadding="0" border="0" bgcolor="990000" align="center" width="100%"><tr><td> <img src="onlinetractiveforce01-200.jpg" alt=""> </td></tr></table> </center></td><td> <td valign="top"> <table align="center" cellpadding="0" width="100%" ><tr><td> <font face="helvetica" color="000066" size="+0"> <p align="justify"> The program <b>ONLINE_TRACTIVE_FORCE </b> takes the tediousness out of the calculation of the design of an open channel over noncohesive materials. The program requires hydraulic data (discharge, side slope, Manning's n, and bottom slope) and material characteristics of the channel sides and bottom, and calculates the normal depth and bottom width of a prismatic trapezoidal channel. </td></tr></table> </td></tr></table> <table><tr><td> <font face="helvetica" color="000066" size="+0"> <p align="justify"> The <a href="onlinetractiveforcereference.html">tractive force method</a> of channel design assumes equilibrium between acting and permissible unit tractive forces, on level ground [channel bottom] and on the channel sides. The acting unit tractive forces coefficients are determined from the appropriate <a href="onlinetractiveforcephilosophyfig01.html">chart</a> (Chow, 1959). The permissible unit tractive forces for canals in noncohesive materials are determined from the appropriate <a href="onlinetractiveforcephilosophyfig02.html ">chart</a>. The angle of repose of the material on the sides is determined from the appropriate <a href="onlinetractiveforcephilosophyfig03.html ">chart</a> also. <p align="justify"> Given design discharge Q, side slope z, Manning's n, and bottom slope S<font size="-1"><sub>o</sub></font>, the program can be used to determine the material properties (particle size and shape) that will produce an optimum design, with a user-chosen aspect ratio [the bottom width to normal depth (b/y<font size="-1"><sub>n</sub></font>) ratio]. Alternatively, given certain material properties and a chosen aspect ratio, including the degree of sinuosity, the program can calculate the design discharge under specified tractive force equilibrium. </td></tr></table> <p> <hr size="2" color="000066"> </p> </font> </td></tr></table></center> </body> </html>