Les relations entre réseau de drainage et dépressions sèches dans le karst tropical sont étudiées sur cinq exemples jamaïcains, où l'écoulement superficiel concentré est peu important et n'apparaît que dans les formations superficielles. Les puits
Scarpfoot depressions in South-Central Sahara - State of knowledge and critical reviews
In this paper reflections on the development of scarpfoot depressions are presented from a geomorphologic-geological, and sedimentological point of view. They are intended to clarify whether post-sedimentary relief development in Central Sahara
started pre-Upper Cretaceous or only in Tertiary, and further whether the geomorphological forms in the area of examination are to be classified as belonging mainly to either a (semi)humid-tropical type of relief or a semi-arid type in terms
of geomorphogenetic aspects. The studies concentrate on the Bilma basin where actually elongated endorheic depressions in the western forelands are ubiquitous.
Tropical cyclogenesis: a comparative study of two depressions in the northwest of Australia
(1980) ; Australie ; Circulation atmosphérique ; Cisaillement vertical ; Cyclone tropical ; Dynamique de l'atmosphère ; Eté ; Géographie physique ; Image satellite ; Ligne de flux ; Mousson ; Mousson australienne ; Niveau isobarique 200 mb ; Niveau
Deux perturbations, de structure apparemment identique, ont été observées en février 1980 sur la même région du Nord-Ouest australien. Mais la première a plus ou moins avorté, alors que la seconde constituait l'embryon du cyclone tropical Enid
Meso-topography and soil cover in tropical karst terrain, West Malaysia
Results are presented of detailed slope and soil depth surveys from 13 plots on tropical karst outcrops in the Malay peninsula. The meso-topography and degree of surface cover vary widely, with differences in terrain type (rocky hilltop, hilltop
depression, steep hillslope, moderate hillslope and moderate footslope), topographic setting and limestone purity accounting for much of the inter-plot variability.
weather systems as revealed by satellite imagery. Systems identified include cloud bands connecting the tropical and temperate circulations, tropical and subtropical cyclones, coastal depressions, cyclones on the west coast and frontal troughs. (AJC).
C 14 dating ; Hawaii ; Lateglacial ; Palaeoclimate ; Palynology ; Pollen diagram ; Quaternary ; Tropical zone
abundance of pollen in surface samples. The pollen-derived temperature index yields an estimate of 3°-5°C temperature depression during the last glacial maximum.
Andes ; Cold areas ; Grain size distribution;Granulometry ; Ground frost;Ground freezing ; Human impact ; Lichen ; Mountain ; Periglacial features ; Soil ; Soil degradation ; Soil property ; Tropical zone ; Vegetation ; Venezuela ; Wind
This study discusses an apparently unreported geomorphic effect caused by off-road vehicles (ORV's) in a tropical periglacial area, the Páramo de Piedras Blancas (Venezuelan Andes). The role of needle ice in transporting pebbles to hollow
depressions is discussed and illustrated with other examples of recent patterned ground from this paramo.
Costa Rica ; Deglaciation ; Glacial features ; Glacial lake ; Moraine ; Mountain ; Palaeo-environment ; Palaeoclimate ; Pleistocene ; Quaternary ; Tropical zone
altitudes (ELAs), calculated separately for each advance by fitting published vertical mass balance profiles of tropical glaciers to their reconstructed glacier surfaces. Their method also yields net accumulation estimates, providing a means for inferring
relative precipitation as well as ELA-derived temperature depressions during the 3 advances.
Canal blocking strategies for hydrological restoration of degraded tropical peatlands in Central Kalimantan, Indonesia
Dam ; Drainage ; Hydraulic works ; Hydrological restoration ; Indonesia ; Kalimantan ; Peat bog ; Tropical zone
. The resulting higher water tables did not completely compensate for the negative effects of increased subsidence near the canals. The canals, which are eating themselves into the peatland, create depressions in the peatland surface leading to interception
Tropical/subtropical geomorphology. Research studies from coastal areas to high mountains
The alluvial gravels in the Sabarmati river basin were deposited in a huge graben bounded by faults related to Cambay basin tectonics. The gravels were accumulated in the depression by an ancient Sabarmati in the form of debris and stream flows
Agricultural productivity ; Coastal environment ; Coastal plain ; Drainage ; Malaysia ; Podsolisation ; Soil ; Soil properties ; Spatial distribution ; Taxonomy ; Tropical zone
This study was conducted along the Kelantan–Terengganu Coastal Plains to explain the occurrence of sandy beach ridges and to determine the physico-chemical properties of the soils formed on them. In between these ridges occurs a slight depression
Delineation of boundary between tropical/subtropical in the middle section for eco-geographic system of South China
China ; Climatic index ; Concept ; Ecosystem ; Geosystem ; Soil ; Southern China ; Subtropical zone ; Tropical zone ; Vegetation index ; Zonal geography
. New concepts of tropical, annual tropical, true tropical and tropical fluctuating zone are formed to understand tropical area. Based on the indexes of climate, vegetation and soil, boundaries of tropical, annual tropical, true tropical and tropical
fluctuating zone of the study area are established. The tropical fluctuating zone explains different locating of different researchers. This paper also puts forward a new method to display boundary for eco-geographic regions.
The A. briefly reviews major themes in published tropical forest research between 1991 and 1992 inclusive in an attempt to identify what questions are believed to be important.
Biogeography ; Ecology ; Ecosystem ; Forest ; Habitat ; Photosynthesis ; Tree species ; Tropical rain forest
The A. reviews the mainstream ecological literature from 1994 to 1995 to gauge the importance of ecophysiological studies in understanding the ecology of tropical rain forests.
The A. reports on the progress in describing and explaining variation of biodiversity in tropical rain forests. He bases this review on a search of the 1997 editions of Ecology Abstracts, Ecological Abstracts and Forestry Abstracts.
Regimenes pluviométricos bimodales en un ambiente tropical : el caso de las Antillas (Régimes pluviométriques bimodaux en milieu tropical : le cas des Antilles)