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<br />41 <br /> <br />POOL <br /> <br />POOL <br /> <br />fLOW <br /> <br /> <br />POOL <br /> <br />Ft.cuu 9. )ff!.nder IIOrpholo;y. <br /> <br />the mid-point of the curve on the convex blink" Secondary current!!. occur <br />within the bends and riffle areas (Figure 10). The cemcave (outer) banI< <br />scour and the convex (inner) bank deposition induced by the secondary <br />current cause meander loops to gradually elctend outward. The mor'e <br />pronounced scour on the downstream faces of the bends makes meander loops <br />gradually migrate downstream. <br /> <br />CONCAVE <br />SANK <br /> <br /> <br />~ <br /> <br />CONVEX <br />SANK <br /> <br />SECONDARY <br />CURRENT <br /> <br />r.pOSS SECTION A - A <br />POOL <br /> <br />~~~~~~f);~~ <br />SECONDA RY <br />CURRENT <br /> <br />CROSS SECTION B - B <br />RIFFLE <br /> <br />Figure 1O~ Secondary water currentll In pooh IInd riffles. <br />