Rainfall changes and rainfall erosivity increase in the Algarve (Portugal)
statistically confirmed by parametric and nonparamertric procedures. Rainfall erosivity and land degradation are related to rainfallregime. The Algarve's rainfall erosivity increase (+17%) was more pronounced than annual and seasonal rainfall changes.
There is evidence that, between hydrological years 1931/2 and 1990/1, rainfall changed in the Algarve. There was an annual rainfall increase (+9%) and a (7%) increase in rainfall during the rainy period (October to February). Both trends were
Spatial and temporal rainfall variability over South Africa, 1963 to 1981
(1963-1981) ; Afrique du Sud ; Anomalie pluviométrique ; Elément climatique ; Géographie de l'Afrique ; Pluviométrie ; Précipitation ; Régime pluviométrique ; Série chronologique ; Série spatiale ; Série spatio-temporelle
The suggestion that the 1970s would be characterised by above-normal rainfall is examined and found to be valid. Spatial and temporal rainfall variations within this period and the preceding dry period are discussed, and the relationship between
the magnitude of rainfall deviations and spatial coverage of rainfall is considered. (AJC).
Assessing changes in the rainfallregime in Nigeria between 1961 and 2004
Nigeria ; Precipitation ; Rainfall ; Rainfallregime ; Seasonality ; Years 1960-69 ; Years 2000-2009
Années 1960 ; Années 2000 ; Nigéria ; Pluie ; Précipitation ; Régime pluviométrique ; Saisonnalité
Cette étude établit les changements dans le régime des pluies au Nigéria entre 1961 et 2004 en termes de (a) saisonnalité absolue - la longueur de la saison sèche et humide; (b) saisonnalité relative - contraste de pluie au cours de l'année; (c
The effects of rainfallregimes and land use changes on runoff and soil loss in a small mountainous watershed
China ; Hubei ; Land use ; Mountain ; Rainfallregime ; Soil erosion ; Water erosion ; Watershed
Bassin-versant ; Chine ; Erosion des sols ; Erosion hydrique ; Hubei ; Montagne ; Régime pluviométrique ; Utilisation du sol
This paper analyzes runoff and soil loss in relation to the rainfallregimes and land use changes in a small mountainous watershed in the Three Gorges Area (TGA) of China. Based on 10 years of rainfall measurements and K-means clustering, 152
rainfall events were classified into 3 rainfallregimes. The mean statistical features of different rainfallregimes display a marked difference. Each rainfallregime results in differing levels of runoff and erosion. The study was conducted
Alizé ; Circulation atmosphérique ; Convergence intertropicale ; Costa Rica ; El Niño ; Interaction océan-atmosphère ; Oscillation climatique ; Précipitation ; Régime pluviométrique ; Variabilité interannuelle ; Zone intertropicale
with the El Niño-Southern Oscillation (ENSO). ENSO can cause floods and droughts in different parts of the country in different seasons. AA. conclude by discussing explanatory mechanisms in rainfallregime in Costa Rica caused by ENSO warm events. - (SLD)
Article begins with a review of the larger scale factors and local factors that influence the precipitation climatology of Costa Rica. Annual and seasonal rainfall records indicate substantial interannual variability, especially in association
Tendance des régimes pluviométriques dans le sud-est méditerranéen Français (1950-2000)
France ; Precipitation ; Rainfallregime ; South-Eastern France ; Years 1950-59 ; Years 1990-99
Années 1950 ; Années 1990 ; France ; France du Sud-Est ; Précipitation ; Régime pluviométrique
Decreasing significant trends (1950-2000) do not affect French mediterranean rainfall, except during few months : March (West of the Rhône river), November or October (East of the river), and November (Rhône valley). They correspond to significant
decreases in mean daily rainfall and negative relations with regional mean sea level pressures. - (BJ)
L'A. étudie au moyen d'une approche par télédétection de la relation dynamique entre la phénologie des feuilles et les régimes pluviométriques à Hawaii. Les résultats montrent que l'amplitude et la périodicité des fluctations de la verdeur dépend
des précipitations. Les pics de verdeur surviennent au cours de la saison sèche dans des écosystèmes secs et durant les périodes sèches dans les forêts humides. Ceci montre que la phénologie des feuilles n'est pas liée à la saisonnalité du régime
This study aims to identify the geographical patterns of seasonal rainfall in China, examine the temporal variability in each precipitation region for various seasons and to investigate the relationships between seasonal rainfall patterns
with atmospheric teleconnections. Rainfall variability in China for the period from 1951 to 1999 was investigated with monthly rainfall data for 160 meteorological stations. It was discovered that the Polar-Eurasia (POL) and Arctic Oscillation (AO) index were
positively associated with winter precipitation, indicating the significance of the winter monsoon in producing the rainfall pattern.
Espagne ; Espagne du Nord ; Précipitation ; Régime pluviométrique ; Typologie ; Variation mensuelle ; Zonation
Etude de la fréquence des précipitations mensuelles et typologie dérivée des régimes pluviométriques dans le Nord de l'Espagne. Régionalisation des types pluviométriques. - (AAG)
Rainfall provides the primary mechanism for soil erosion in South China. This paper examines the seasonal regime and the spatial pattern of rainfall in the Province of Guangdong. At the regional level, trend surface analysis suggests highest
rainfall at the central and southwestern belts, but there are strong rainfall anomalies due to the influence of topography and the funnelling of moist air flows. On a local scale, rainfall is not a limiting factor to soil erosion, and the zones of serious
Negative and positive effects of topsoil biological crusts on water availability along a rainfall gradient in a sandy arid area
Data on rainfall, runoff, soil moisture regime, and vegetation cover were collected at 5 monitoring sites in a sandy area along the Israeli-Egyptian border, where average annual rainfall varies from 86 to 160 mm. Results obtained cast doubt
of the prevailing idea regarding the positive relationship between average annual rainfall and ecosystem characteristics. The findings are attributed to the decisive role played by the non-uniform properties of the topsoil biological crusts along the rainfall
gradient considered. The process described may be regarded as a desertification process with increasing annual rainfall.
Effects of land use, land cover and rainfallregimes on the surface runoff and soil loss on karst slopes in southwest China
Analyse des groupes ; Calcaire ; Chine ; Erosion des sols ; Erosion hydrique ; Fracture ; Guizhou ; Infiltration ; Karst ; Mousson ; Précipitation ; Ruissellement ; Régime hydrique ; Utilisation du sol ; Zone subtropicale
China ; Cluster analysis ; Fracture ; Guizhou ; Infiltration ; Karst ; Land use ; Limestone ; Monsoon ; Precipitation ; Rill wash ; Soil erosion ; Subtropical zone ; Water erosion ; Water regime
Surface runoff and soil loss from 2007 to 2010 related to land use and rainfallregimes in karst hill slopes in Puding County, in Guizhou Province, were analyzed. Using the hierarchical clustering method, 61 rainfall events under the subtropical
monsoon climate condition were classified into 5 types of rainfallregimes according to the depth, maximum 30-min intensity, and duration of rainfall. The observations indicated that limestone fissures and fractures play important roles in surface runoff
Contrasting rainfall patterns in the upper Middle West
(1975-1976) ; Circulation atmosphérique ; Etats-Unis ; Géographie de l'Amérique ; Humidité atmosphérique ; Middle West ; Pluie ; Précipitation ; Régime pluviométrique ; Sécheresse ; Type de temps
August, 1975 and 1976, featured strongly contrasting rainfallregimes in the midwestern United States. Both the severe drought of 1976, and the record surpluses of 1975 were related to repetitive, but different, circulations in the middle
In this study, the results of a series of experiments are reported, summarizing the soil loss and runoff response from a 0.6x3.75 m area to different rainstorm regimes, slope steepnesses, subsurface soil water pressures, and surface roughnesses
under controlled laboratory conditions using a flume and rainfall simulator as water applicators, and a laser microreliefmeter and tensiometric system as soil response measuring devices. The soil chosen was a highly erodible Grenada loess. Discussion