《The Broads (Collins New Naturalist Library, Book 46)》A. E. Ellis电子书txt下载、在线阅读、内容简介、评论读后感-当当读书

The Broads (Collins New Na…

A. E. Ellis

内容简介

The broads are shallow, reed-fringed lakes associated with rivers that wind slowly through the lowlands of east Norfolk and neighbouring Suffolk to flow into the North Sea through a common harbour at Great Yarmouth. Their waters are often ruffled by sea breezes and salt tides affect them from time to time; indeed, but for coast defences, they and many thousands of acres of adjacent marshes would be at the mercy of regular sea flooding. It used to be thought that they were relict pools of an estuary clogged by centuries of silting and reclaimed by the spread of marsh vegetation; but the recent researches of Dr. J. M. Lambert and her associates have proved (seechapter 3) that although estuarine conditions have prevailed temporarily in the lower parts of the east Norfolk river valleys on more than one occasion in the past, the broads originated comparatively recently as peat-pits, flooded and linked by artificial channels with the rivers, as the general water-level rose in late historic times.

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