ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879930

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractThe characteristics of three high intensity rainstorms, and the landslides they induced, in the greywacke ranges of the South Auckland district, New Zealand, are described. The return period of storms of such magnitude that they cause landsliding in grass-land areas is about 30 years, and similar erosion in forested catchments is caused by storms with a return period of about 100 years. The landslides are in deeply weathered sandstones and siltstones: most landslides are of the debris avalanche type. Landslides occur preferentially on upper slope segments and as a result slope evolution produces an upper slope convexity. Denudation in areas of greatest storm damage produces an average of 40 to 80 mm of ground lowering, but 10 mm is more common: this gives an average denudation rate of about 0.25 to 1 mm/year from landsliding alone. In areas in which landsliding is the dominant hillslope process valley floors suffer considerable aggradation and the deposits produced by one storm may remain in the valley until the next one. Under such conditions the contention of Wolman and Miller (1960) that the dominant geomorphic events are those with a return period of 1 to 5 years are not applicable, and more catastrophic events of 30 years return period for grassland and 100 years for forest appear to be geomorphically dominant.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879931

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractA group of complex landslides in the Razorback area, Australia is described. They are located on hillslopes underlain by Triassic shales and sandstones, on grazing land derived from earlier woodland. The slide types range from debris slides and slumps to earthflows and mudflows. Continued landsliding has been reported since the 1880's until the present. The influence of land use and of annual and daily rainfall on triggering of the landslides is discussed.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879932

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractAn examination is made of some problems posed by mass movements on slopes in Hong Kong. The geographical background to such physical hazards is outlined, and the circumstances leading to inadvertent acceleration of slope processes through human interference are considered. The impact of such disastrous mass movements on an area of acute population pressure prompts attention to an adapted form of land evaluation for planned use and judicious management of the problem slopes.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879933

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractThe Kanto Earthquake of 1923 triggered widespread debris-avalanching in the Tanzawa Mountains, located about 50 kms southwest of Tokyo, where since then small debris avalanches have frequently taken place at times of heavy rainfalls.The author observed erosion processes and measured rates of erosion from March, 1970, to September, 1973, on a south eastward facing steep slope. The rate of erosion was estimated to be on the order of 103m3/km2per year.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879934

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractStationary investigations of the mudflows recorded in the Buzău Subcarparthians (southeast of the Carpathian chain) have revealed some peculiarities of both their involvement in slope modeling and their dynamics. The first mudflow investigated carried, in the course of eight years, 21,500 m3of debris. These deposits gradually reached the mudflow track due to the successive release of some slides and falls in the source area. The second example (48,000 m3displaced) refers to a mudflow triggered by extreme rainfalls (177.8 mm rain in 24 hours).

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879935

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractThis report is a review of actual Polish research on slope processes and shows the concentration of intrest to the Carpatian Mountains. Many studies are undertaken in Poland on contemporary slope processes and several projects of process monitoring are reported.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879936

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractRain gauge records show that on September 1, 1951, more than 10 cm of rain fell in one hour over the Mt. Le Conte area, Great Smoky Mountains National Park. Numerous debris slides resulted from the cloudburst, and slide scars are still prominant features on the landscape. Three sections are identified within each slide track: the scar head, middle zone, and depositional zone. Slide dimensions vary considerably. Slide SB-10, largest in the Alum Cave Creek watershed, has a slope area of 10,500 sq m with an estimated regolith removal of 3,400 cu m. Slide ACC-3, smallest in the watershed, has a slope area of 154 sq m with regolith removal estimated at 62 cu m. Scar head slopes have a mean of 40°, with a range of 35°to 44°. Intense rainfall, slope form, and compositional layering of the Anakeesta Formation were significant factors for debris slide formation and location in the Mt. Le Conte area. Pedological, vegetational, and cultural factors may have also affected slide distribution, but after-the-fact analyses for these parameters make their exact function in slide activity unclear. The question of recurrence interval for slide producing storms essentially remains unanswered, although available data indicate that the return period may possibly be 100 years or longer.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879937

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

AbstractHeavy rainstorms in summer and autumn trigger landslides and debris flow in arctic mountains. However, the recurrence intervals are long. Some cases from Scandinavia are described. They were caused either by cyclonic rainstorms over large areas (Andöya/Abisko slides of October 1959, Spitsbergen slides of July 1972) or by convectional rainfalls in small areas (Ulvådal slides of June 1960, Tarfala debris flows of July 1972). Cf. Table 5.The frequency of landslide-triggering rainstorms in arctic mountains is low, but their effect on the slopes can be long-lasting due to very slow re-growth of vegetation in cold areas. Recurrence intervals between mass movements can be studied by analysis of recovery of soils and vegetation on surfaces of erosion and deposition, compared with other evidence, such as stratigraphy of deposits, rainfall records and historical tradition.

ISSN:0435-3676    

DOI:10.1080/04353676.1976.11879938

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor