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‖ thalweg Geog.
(ˈtɑːlvɛg, ‖ ˈtaːlvɛç)
Also talweg (after the reformed Ger. spelling).
[Ger. thalweg bottom path of a valley, f. thal valley (see dale) + weg way. Also in Fr. (1815 Traité de Paris, Littré).]
The line in the bottom of a valley in which the slopes of the two sides meet, and which forms a natural watercourse; also the line following the deepest part of the bed or channel of a river or lake.
1831W. Whewell Let. 22 Feb. in I. Todhunter William Whewell (1876) II. 113 For thalweg and riggin' I do not think you can do better than take daleway and ridge⁓way. 1862Wraxall Hugo's Misérables v. xxii, The grand sewer running along the thalweg of the valley. 1881Harper's Mag. LXIV. 275 Thalweg..is a German geographical term, employed in the records of the congress of Berlin, which designates the line of lowest level formed by the two opposite slopes of a valley. 1894(May 12) Agreemt. betw. Gt. Brit. & Congo State in Parl. Papers Eng. XCVI. 26 Thence it [the boundary] shall follow the ‘thalweg’ of the Nile southwards to Lake Albert. 1897Educat. Rev. XIII. 89 This thalweg which forms a nearly continuous waterway from the Volga to the Amur. 1937Geogr. Jrnl. LXXXIX. 260 The development of a terrace..involves two clearly distinguishable phases—firstly, the formation of a continuous flood plain, and secondly, the incision of the talweg below it. 1946L. D. Stamp Britain's Struct. & Scenery v. 49 Soundings show that the floor of a ria, the old river talweg, slopes steadily seawards and there is no ‘lip’. 1966J. S. Hardman tr. R. Boulanger's Middle East 608 Whilst conducting excavations towards the thalweg of the Kidron valley the Franco-British expedition discovered the remains of a rampart belonging to the Canaanaean (or Jebusite) Jerusalem. 1968R. W. Fairbridge Encycl. Geomorphol. 1149/1 The opposite of the talweg itself is a divide, i.e., the lines joining all high points in topography. |