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<br />. <br /> <br />. <br /> <br />CHANNEL WILL WIDEN IF 't > 2'tc <br />(Parker, 1979; Andrews, 1984) <br /> <br /> <br /> <br />--------------------- <br /> <br />,0 <br /> <br />.., <br /> <br /> <br />, <br />, <br />I <br />I <br />I <br />I <br />I <br />