摘要:

ABSTRACTDuring a period of five years the medium sized Upper Kafubu catchment (1540 km2) was studied for water discharge and suspended sediment transport. Due to the excessive deforestation, the mean annual runoff (265.3 mm) in the catchment is higher than in the undisturbed adjacent basins. The flood peaks are smoothed by the damping effect of a large swamp area. The observed suspended sediment yields are extremely low and decrease in a downstream direction as a consequence of depositional sinks. The established suspended sediment-discharge relationships are not useful to calculate the total load. The causes of this anomaly are examined.

ISSN:0435-3676    

DOI:10.1080/04353676.1986.11880188

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

摘要:

ABSTRACTSeveral caves formed within gigantic boulders have been researched in Sweden. Many facts suggest a neotectonic origin for these bouldercaves, meaning that they were formed by earthquakes during the melting of the Weichsel-glaciation about 10.000 years B.P., when the isostatic uplift of the region could have reached 0.2–0.5 m per year.The author proposes a three-fold classification of such caves, into 1. Caves in split roches moutonnées, 2. Caves in collapsed mountain-slopes, and 3. Caves in sub-horizontally displaced mountain-tops.The most prominent evidence of neotectonic origin regarding these caves is that (a) the boulders forming many of these caves are striated, which proves that they were formed after the advance of the inland ice; (b) huge talus blocks forming caves of type 2 are situated in a manner which that indicates a momentary collapse of the mountain-slope; and (c) scarcely any weathering products are found on the floors of the caves; this indicates a recent date for cave formation.

ISSN:0435-3676    

DOI:10.1080/04353676.1986.11880189

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor

摘要:

ABSTRACTAre granite inselbergs, low domes and platforms, erosional remnants, or are they the exposed margins of stocks or batholiths? Examples of the second type are cited from various parts of the world, but they are comparatively few in number. Evidence and argument are adduced to suggest that most of the forms are the stumps of once higher masses. Inselbergs characteristically occur in multicyclic landscapes. Some inselbergs show evidence of phased exposure and are in that sense multicyclic forms. Remnants of roof-rock are not preserved in most inselberg landscapes, which do not conform morphologically to the shape of the rooves of igneous emplacements.

ISSN:0435-3676    

DOI:10.1080/04353676.1986.11880190

出版商:Taylor&Francis    

年代:1986

数据来源: Taylor