摘要:

ABSTRACTA series of composite mudflows have affected adversely the road communications along segments of the coast of north-east County Antrim, Northern Ireland. Field mapping and air photograph interpretation have established the distribution of these phenomena. Detailed investigations of the movement and of the morphology of the mudflows have been made at a number of sites, principally at Minnis North.The movement of the mudflows is initiated by the seasonal accumulation of rainfall leading to saturation of the inherently unstable Liassic shales which underlie several hundreds of feet of chalk and basalt strata forming the Antrim Plateau. Large scale, late-Pleistocene slumping on the relatively steep coastal slope along the eastern edge of the plateau has exposed the Liassic shales with high angles of dip. This permits comparatively rapid absorption of water and consequent deterioration of the cohesion of the shales. This has led to extensive development of bowl-slides, flow tracks defined by marked shear planes and depositional toe-zones, all of which are active at present.

ISSN:0435-3676    

DOI:10.1080/04353676.1968.11879773

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

ABSTRACTSome results from a series of measuring trips by car are discussed. The measuring trips were undertaken at three-hourly intervals. For more comprehensive mean value calculations, fixed stations with recording instruments have been used. The monthly mean temperature differences for every other hour of the 24-hour period between the various stations have been studied. The thawing after a snowfall has been measured on the ground and evaluated from aerial photographs.

ISSN:0435-3676    

DOI:10.1080/04353676.1968.11879774

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

摘要:

ABSTRACTKarst depression morphology was analysed with respect to elements of lithology, structure, and relative location in the erosion system in a part of South Central Kentucky. Depression morphology was assessed by mean depression relief, mean depression area, and mean depression flank slope inclination indices.Mean depression area, relief, and flank slope inclination had large values where the following conditions prevailed: 1. where limestones were characterized by low mean insoluble residue contents; 2. where high hydraulic gradients characterized the karst erosion system (this was measured by the karst relief ratio); 3. where a large percentage of the surface runoff in any area was diverted to the karst underground cavern drainage systems; 4. where a high percentage of the karst depressions were adjusted to lines of structural weakness; 5. where dense limestones were encountered; and 6. in areas which were characterized by a location near the mouth of the karst drainage system. Mean depression relief, area, and flank slope inclination decreased where any combination of these conditions did not prevail.Regression studies revealed that 92% of the variations of depression relief, 70% of the variations of depression areas, and 73% of the variations of depression flank slopes are accounted for by variations in lithology, structure, karst drainage system geometry, and relative location in the erosion systems.

ISSN:0435-3676    

DOI:10.1080/04353676.1968.11879775

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

ISSN:0435-3676    

DOI:10.1080/04353676.1968.11879776

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor

ISSN:0435-3676    

DOI:10.1080/04353676.1968.11879777

出版商:Taylor&Francis    

年代:1968

数据来源: Taylor