The significance of scarp retreat for cenozoic landform evolution on the Colorado Plateau, U.S.A.
In examining whether the denudational efficiency of scarp retreat was sufficient to account for the wide erosional gaps in the sedimentary cover, rates of scarp retreat were determined by using the information of dated volcanic material
and by applying a new method, which calculates the amount of retreat from the width of beheaded valleys of known age. Rates of retreat range from 0.5 to 6.7 km/my. The results show that the rates of retreat are controlled by the thickness and resistance
Holocene rockwall retreat in Svalbard : a triple-rate evolution
Volumetric calculations of slope deposits, direct measurements of rockwall retreat and chronological control based on lichenometry provide a wide range of rockwall retreat rates in Svalbard that appears consistent with previous evaluations from
other Arctic areas. A triple-rate rockwall retreat is suggested for the last 2 millennia : very slow biogenic flaking, moderate retreat due to frost shattering and rapid retreat associated with post-glacial stress relaxation. Bedrock conditions appear
Processes and rate of retreat of the clay and sandstone sea cliffs of the northern Boulonnais (France)
Retreat of the clay and sandstone cliffs of the northern Boulonnais has been quantified using stereo photogrammetry. The low retreat rate of this coastal strip is far less than that encountered on chalk and clay-chalk cliffs of either side
of the Channel. The retreat rate is closely related to shore platform morphology and dynamics. This study will help to determine the long term evolution of the Boulonnais coast.
Headcut retreat in a semiarid watershed in the southwestern United States since 1935
Within the Walnut Gulch Experimental Watershed (WGEW) survey data was available to quantify the retreat of the 3 most prominent headcuts in sub-watershed 63.011 from 1935 to 2006. The headcuts serve as major sediment sources and were investigated
to identify and understand factors controlling retreat rate in this watershed. The data was incorporated and analyzed in a geographical information system (GIS). The headcuts have retreated persistently since 1935. A power relationship was fitted by regression
correlating the retreat rate with the product of contributing drainage area and areal precipitation for precipitation exceeding a threshold intensity. This site specific relationship may not apply universally in other regions. Headcut retreat was not induced
by external forcing. The data did not allow timing or identification of initial causes for headcut retreat. Data suggests that all 3 headcuts will continue to retreat in the future.
Short-term bank gully retreat rates in Mediterranean environments
In this study, short-term headcut retreat was monitored from 46 active bank gullies, selected in the Guadalentin and the Guadix basin in Southeast Spain, over two years. The AA. investigate the relationship between annual gully head retreat rate
Djebel Aziza-die Ruinen einer Berber-Rückzugssiedlung in Südtunesien. (Djebel Aziza-the ruins of a retreat-settlement of the Berber in southern Tunisia)
This study identifies factors that affect the speed of rockwall retreat of flysch cliffs between Kane Point and Strunjan on the Slovenian coast. Individual factors were combined in a geographical information system with mapped recent erosion
features. The results indicate the influence of individual factors on the formation of erosion rills, gullies, surfwave breaks, slumps, and rockfalls; that is, flysch coast retreat processes. The article also presents the threat due to rockfalls and slumps
Geological constraints on Antarctic palaeo-ice-stream retreat
Submarine landforms preserved in bathymetric troughs on the Antarctic continental shelf show that the style of ice stream retreat across the shelf following the last glacial maximum varied between different troughs. Three styles of retreat
are inferred from the geological evidence : rapid, episodic and slow. They indicate that Antarctic palaeo-ice-streams did not respond uniformly to external forcing at the end of the last glacial cycle. Rather, their diachronous retreat reflects the dominance
Geomorphic and sedimentary evidence for patterns of late Midlandian ice retreat in the Tempo Valley, north-central Ireland
Patterns of late Midlandian ice retreat in the Tempo Valley are reconstructed from field morphological and sedimentary evidence. Ice retreat stages reflect the splitting up of the regional Omagh Basin ice mass into separate Omagh Basin and Clogher
Valley components, and the formation and later drainage of glacial lakes which are controlled by the mutual interactions of these ice masses. The Tempo Valley area illustrates some generic problems in reconstructing ice retreat stages in Ireland
The contemporary retreat of Tasman Glacier, Southern Alps, New Zealand, and the evolution of Tasman proglacial lake since AD 2000
Glacier ; Glacier retreat ; Mountain ; New Zealand ; Proglacial lake ; South Island ; The 2000's
In the Aoraki/Mt Cook National Park, the retreat of Tasman Glacier between 2000 and 2008 has occurred in 2 distinct periods : an initial period of relatively slow retreat prior to 2006, followed by a secondary period of rapid retreat between 2006
and 2008. During the period 2000–2006, the controlling process of ice loss at the terminus was iceberg calving resulting from thermal undercutting. In contrast, the retreat between 2006 and 2008 was probably controlled by buoyancy-driven iceberg calving
Estimates of slope retreat around the Ivory Glacier catchment, South Island, New Zealand
This paper presents estimates for short (1 yr) and medium-term (10-100 yr) slope retreat rates around a small glaciated catchment on the Main Divide of the Southern Alps (Ivory Glacier, New Zealand).
Retreating cliffs in the humid tropics: an example from Paraiba, northeastern Brazil in Geomorphology of changing coastlines.
coast, northeast Brazil, under a humid tropical climate, 21 % of the coastline consist of retreating marine cliffs, cut into Plio-Pleistocene sandy clays, a very favourable factor.
Coastal cliff retreat rates at Beit-Yannay, Israel, in the 20th century
Research indicates that the aeolianite (Kurkar) cliffs along the Israeli Mediterranean coastline have continuously retreated eastward during the last few decades. The AA. compare the historic location of the cliff crest edge at Beit-Yannay