Physiographic Processes, by J.W. Powell

Physiographic Processes, by J.W. Powell

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: of sand-bar harborages owes its origin to the inlets or breaches which are formed where the waters of a lagoon, overfilled by the rivers, break out into the sea. Good instances of this nature abound along the Atlantic coast south of Cape Hatteras. These passages from the open ocean to the sheltered expanses of the lagoons or bays are generally shallow. In almost all cases they are much obstructed by extensive sand bars both on the outside and inside of the opening, --shallows formed by the tidal currents, which obtain considerable energy as they move in and out of the narrow channel. As a class, sand-bar harbors are, because of their shallow nature, of less value than are those which are formed in other ways; but in many regions, as along the southern coast of the United States, they are about the only shelters for ships. SUMMA1tY.--.Ve have now considered the most important phenomena of beaches, and the share which these structures have in preserving the land from the assaults of the sea. It would be possible to extend indefinitely an account of the facts of the physical nature which these structures exhibit. Such details, however, would best be left to the unaided inquiry of the student who undertakes the study of particular parts of the shore. Such a person will do well to extend his inquiries along two lines, --the one leading to an investigation concerning the effect of winds from difierent directions in altering the details of sand beaches; and the other, to the development of the various species of animals and plants along both the rocky and the sandy shores. Inquiries of the kind above advised may, if properly directed, prove of great service not only to the original observer, but to the science which he is pursuing. more

Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • United States
  • English
  • black & white illustrations
  • 1236832485
  • 9781236832481