The Training of Rivers, And, Estuaries, Vol. 4 (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from The Training of Rivers, And, Estuaries, Vol. 4

Contrast between the Outlets of Tideless and Tidal Rivers - Sedi ment-bearing rivers flowing into a tideless sea, are Obstructed at their outlet by the deposit Of the alluvium they discharge into the sea, which gradually accumulates, reducing the fall of the river near its mouth and forming a delta. The bars, accordingly, at the mouths of these rivers are wholly of fluvial origin, differing in this respect from the bars of tidal rivers, which result from the drift of sand and shingle along the coast tending to form a continuous strand across the river mouths, an action that is only partially prevented by the ebb and flow Of the tide, aided by the fresh-water discharge. The bars also of delta-forming rivers project consider ably in advance of the general coast-line, together with the mound of deposit composing the delta; so that waves sweeping across the outlet, and littoral currents arrest more or less the advance of the delta. And the formation and seaward progression of the bar. The bars of tidal rivers, on the contrary, being formed by detritus from the coast and clifl's, are only 81 ightly pushed out in advance of the general line of the foreshore by the current of the river, and are raised by storms driving a large quantity of detritus along the shore.

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