scholarly journals DISTRIBUCIÓN ESPACIAL DEL ÍNDICE DE CONCENTRACIÓN DE PRECIPITACIÓN DIARIA EN LOS ANDES CENTRALES PERUANOS: VALLE DEL RIO MANTARO

2017 ◽  
Vol 19 (2) ◽  
pp. 13 ◽  
Author(s):  
Ricardo Zubieta ◽  
Miguel Saavedra
Keyword(s):  
Concentration Index ◽  
Daily Precipitation ◽  
River Valley ◽  
Spatial And Temporal Patterns ◽  
Precipitation Concentration ◽  
The North ◽  
Palabras Clave ◽  
Del Rio ◽  
North And South ◽  
Rainy Days

Los altos porcentajes de concentración de precipitación diaria en pocos días, pueden incrementar el potencial de erosión, inestabilidad de laderas y riesgo de inundaciones, siendo estos problemas comunes en el Perú, por lo que es importante el conocimiento acerca de la precipitación a nivel diario. En este articulo, se ha llevado a cabo una investigación acerca de los patrones espaciales y temporales de la concentración de precipitación diaria en los andes centrales del Perú, mediante el índice de concentración (IC), que evalúa la variación de la valoración de precipitación diaria, la contribución de grandes lluvias a la cantidad total presentada. El índice es aplicado a una curva exponencial como Y = aX exp(bX ) , el cual ajusta el porcentaje acumulado de precipitación en Y contribuida por el porcentaje acumulado de días X llevado a cabo en un lugar, en el periodo 1964-2004, con el cual es posible generar superficies de concentración pluviométrica. Donde las máximas concentraciones registradas en el valle del rio Mantaro, posiblemente estén asociadas a la dinámica de los vientos, como la corriente de chorro de Sudamérica, que se adentran al valle proveniente del Norte y Sur. Donde el 25% de días más lluviosos representan el 60% o más de la cantidad total de días con lluvia. Palabras clave.-Índice de concentración, Precipitación diaria; Valle del rio Mantaro. ABSTRACTHigh percentages total precipitation concentration in a few very rainy days can increase the potential of erosion, instability and risks of floods, these problems are common in Peru. So it is important to know about the daily precipitation. This paper presents, an investigation of the spatial and temporal patterns of daily precipitation concentration, in central Andes of Perú, the Concentration index (CI) was evaluates measurement the varying weight of daily precipitation, the contribution of the days of greatest rainfall to the total amount. The index is applied to exponential curves such as Y = aX exp(bX), which adjust the accumulated percentages of precipitation Y contributed by the accumulated percentage of days X on which it took place, in the period 1964-2004, with which it is possible to generate concentration surfaces daily pluviometric. The highest concentrations recorded in the Mantaro river valley, may be associated with the dynamics of the winds as the stream in South America, leading into the valley from the north and south, where 25% of rainy days account for 60% or more of the total number of days with rain. Keywords.- Concentration index; Daily precipitation; Mantaro river valley.

scholarly journals Distribución espacial del índice de concentración de precipitación diaria en los Andes centrales peruanos: valle del rio Mantaro

2019 ◽  
pp. 61-70
Keyword(s):  
Concentration Index ◽  
Daily Precipitation ◽  
Central Andes ◽  
River Valley ◽  
Slope Instability ◽  
Spatial And Temporal Patterns ◽  
Precipitation Concentration Index ◽  
Precipitation Concentration ◽  
Del Rio ◽  
Rainy Days

Distribución espacial del índice de concentración de precipitación diaria en los Andes centrales peruanos: valle del rio Mantaro Spatial distribution of a daily precipitation concentration index in central Andes of Perú: Mantaro river valley Zubieta Ricardo, Saavedra Miguel Instituto Geofísico del Perú, Calle Badajoz 169 IV Etapa, Mayorazgo, Ate. Lima 03, Perú Universidad Nacional Agraria la Molina, Av. La Molina s/n La Molina, Lima 03, Perú DOI: https://doi.org/10.33017/RevECIPeru2012.0022/ Resumen Los altos porcentajes de concentración de precipitación diaria en pocos días, pueden incrementar potencial de erosión, inestabilidad de laderas y riesgo de inundaciones, siendo estos problemas comunes en el Perú. Por lo que es importante el conocimiento acerca de la precipitación a nivel diario. En este articulo, ha sido llevado a cabo una investigación acerca de los patrones espaciales y temporales de la concentración de precipitación diaria en los Andes centrales del Perú, mediante el índice de concentración (IC), que evalúa la variación de la valoración de precipitación diaria, la contribución de grandes lluvias a la cantidad total presentada. El índice es aplicado a una curva exponencial como Y = aX exp(bX ) , el cual ajusta el porcentaje acumulado de precipitación en Y contribuida por el porcentaje acumulado de días X llevado a cabo en un lugar, en el periodo 1964-2004, con el cual es posible generar superficies de concentración pluviométrica. Donde las máximas concentraciones registradas en el valle del rio Mantaro, posiblemente estén asociadas a la dinámica de los vientos, como la corriente de chorro de Sudamérica, que se adentran al valle proveniente del Norte y Sur. Donde el 25% de días más lluviosos representan el 60% o más de la cantidad total de días con lluvia. Descriptores: índice de concentración, precipitación diaria; curva exponencial; valle del rio Mantaro. Abstract High percentages of the yearly total precipitation concentration in a few very rainy days can increase the potential of erosion, slope instability and risks of floods, these problems are common in Peru. So it is important to know about the daily precipitation. In this paper, an investigation of the spatial and temporal patterns of daily precipitation concentration, in central Andes of Perú, by Concentration index (CI) that evaluates the varying weight of daily precipitation, the contribution of the days of greatest rainfall to the total amount, is presented. The index is applied to exponential curves such as Y = aX exp(bX), which adjust the accumulated percentages of precipitation Y contributed by the accumulated percentage of days X on which it took place, in the period 1964-2004, with which it is possible to generate concentration surfaces daily pluviometric. The highest concentrations recorded in the Mantaro river valley, may be associated with the dynamics of the winds as the jet stream in South America, leading into the valley from the north and south, where 25% of rainy days account for 60% or more of the total number of days with rain. Keywords: concentration index; daily precipitation; exponential curves; Mantaro river valley.

scholarly journals Precipitation trends and a daily precipitation concentration index for the mid-Eastern Atlantic (Canary Islands, Spain)

2017 ◽  
Vol 43 (1) ◽  
pp. 255 ◽  
Author(s):  
P. Máyer ◽  
M.V. Marzol ◽  
J.M. Parreño
Keyword(s):  
Time Series ◽  
Canary Islands ◽  
Concentration Index ◽  
Daily Precipitation ◽  
Daily Rainfall ◽  
Kendall Test ◽  
High Concentration ◽  
Precipitation Concentration Index ◽  
Precipitation Concentration ◽  
The North

This paper pursues two objectives: first, to determine the trends of seasonal and annual precipitation in the Canary Islands and, second, to identify trends in the daily precipitation concentration index (CI). For the first objective, we used data from 1970-2013 of 23 rainfall stations located on different islands, after verifying the homogeneity of their series. For the second, the sample was reduced to eleven series since deficiencies in data records of less than 1 mm of daily precipitation were appreciated. We used the nonparametric Mann-Kendall test to determine whether the series showed linear trends in annual and seasonal precipitation and in the values of CI. The seasonal results showed negative trends in spring and winter in almost all the time series considered, especially in the north of Gran Canaria and Tenerife. Conversely, 78% of the series in autumn recorded an increase in the precipitation. The annual balance indicated a decline of rainfall in most of the locations, because of the high concentration of precipitation in winter. Finally, the majority of the time series exhibited a trend toward a greater concentration of daily rainfall, in particular those series located in areas where the main towns are settled, which is an important issue to consider because of severe flooding and other geomorphological processes.

scholarly journals Spatio-temporal evolution characteristics of precipitation in the north and south of Qin-ba Mountain area in recent 43 years

2020 ◽  
Vol 13 (17) ◽  
Author(s):  
Zhigang Cheng ◽  
Xiaoxiao Chen ◽  
Yueyue Zhang ◽  
Liya Jin
Keyword(s):  
Heavy Rain ◽  
Kendall Test ◽  
Mountain Range ◽  
Mountain Area ◽  
Light Rain ◽  
Precipitation Concentration ◽  
The North ◽  
Grade Classification ◽  
Daily Precipitation Data ◽  
North And South

Abstract Using the daily precipitation data at 89 stations during 1975–2017 in the Qin-ba Mountain area, variation characteristics of different-grade precipitation in the north and south of the Qin-ba Mountain area are analyzed by the linear regression, Mann-Kendall test, and correlation analysis, based on the precipitation grade classification standard proposed by Dai Aiguo and the division of the geo-ecological boundary in mountain range presented by Kang Muyi. The results are as follows: (1) Light rain occurs most frequently, and the percentage of light rain in the north is twice that of the southern region. Rainstorms are the most rare. Precipitation above 800 mm mainly occurs south of the study area, and the result is consistent with the boundary between the north and south of the precipitation. (2) The beginning of precipitation mainly occurs in early April. The high precipitation concentration (PCD) in the north is an important reason for the debris flow disaster. The north-south precipitation concentration period (PCP) is about 1 month ahead of the central part. (3) In the past 43 years, the overall precipitation in the Qin-ba Mountain area has shown a decreasing trend, with the frequency of light rain and the percentage of heavy rain decreasing year by year. (4) The frequency of light rain is negatively correlated with other frequencies. In addition, the fewer days of precipitation, the later the precipitation concentration period (PCP) occurs, which means that the disaster occurs later.

MARIA, MARIA: histórias de vida de mulheres no sertão do São Francisco (MG)

2020 ◽  
Vol 17 (29) ◽  
pp. 138-158
Author(s):  
CLÁUDIA MAIA ◽  
BÁRBARA FIGUEIREDO SOUTO
Keyword(s):  
Gender Relations ◽  
Life Histories ◽  
Minas Gerais ◽  
The North ◽  
Palabras Clave ◽  
The Feminine ◽  
History Of ◽  
Historia De Vida ◽  
Del Rio ◽  
Siglo Xx

O artigo objetiva problematizar modelos hegemônicos de feminilidade a partir da história de vida de duas mulheres que experienciaram o sertão às margens do rio São Francisco (MG), habitando o município homônimo ao rio. Busca ainda entender como elas representam a si mesmas e a outras mulheres; como foram construídas as relações de gênero e os sentidos que constituem o feminino no sertão norte-mineiro na primeira metade do século XX. Partimos da compreensão de que as relações de gênero não são estáticas e permanentes e que as representações acerca do feminino são históricas, ou seja, não é possível generalizar um modelo de feminilidade para todos os estratos sociais e para todos os contextos geo-históricos. Palavras-chave: Gênero. Mulheres. Sertão. MARIA, MARIA: life histories of women in the backwoods of the São Francisco (MG) Abstract: The article aims to problematize hegemonic models of femininity from the life history of two women who experienced the backwoods on the banks of the São Francisco river (MG), inhabiting the homonymous municipality to the river. Also, it seeks to understand how they represent themselves and other women; how the gender relations were built and the meanings that constitute the feminine in the north of Minas Gerais backwoods, in the first half of the twentieth century. We start from the understanding that gender relations are not static and permanent and that the representations about the feminine are historical, that is, it is not possible to generalize a model of femininity for all social strata and for all geohistorical contexts. Keywords: Gender. Women. Backwoods. MARIA, MARIA:historias de vida de mujeres en el interior de São Francisco (MG) Resumen: El artículo tiene como objetivo problematizar los modelos hegemónicos de feminidad a partir de la historia de vida de dos mujeres que vivieron en el interior a las orillas del río São Francisco (MG), que habitan en el municipio homónimo del río. También busca comprender cómo ellas representan a sí mismas y a otras mujeres; cómo se construyeronlas relaciones de género y los significados que constituyen el femenino en el norte de Minas Gerais en la primera mitad del siglo XX. Partimos de la comprensión de que las relaciones de género no son estáticas y permanentes y que las representaciones sobre el femenino son históricas, es decir, no es posible generalizar un modelo de feminidad para todos los estratos sociales y para todos los contextos geo-históricos. Palabras clave: Género. Mujeres. Interior.

A reconnaissance survey of the woody flora and vegetation of the Catapú logging concession, Cheringoma District, Mozambique

Bothalia ◽  
2007 ◽  
Vol 37 (1) ◽  
pp. 57-73 ◽  
Author(s):  
M. Coates Palgrave ◽  
A. E. Van Wyk ◽  
M. Jordaan ◽  
J. A. White ◽  
P. Sweet
Keyword(s):  
Transition Zone ◽  
Woody Species ◽  
River Valley ◽  
Regional Centre ◽  
The North ◽  
Reconnaissance Survey ◽  
Infraspecific Taxa ◽  
First Time ◽  
North And South ◽  
Zambezi River

A checklist of the trees, shrubs and Hanes of Catapú, Cheringoma District, Mozambique, is presented. Floristically the study area falls within the Swahilian/Maputaland Regional Transition Zone. In total, 238 woody species and infraspecific taxa have been recorded, representing 59 families and 167 genera. Most species (64%) occur both to the north and south of the study area. 26% have their core distribution in the Swahilian Regional Centre of Endemism, 4% have a more southerly distribution. 14 are endemic to the Swahilian/Maputaland Regional Transition Zone and two near-endemic, extending into the Zambezian Regional Centre of Endemism only along the Zambezi River Valley as far west as Kariba. The checklist includes the Sena names for 191 species, 77 of which are recorded for the first time. Comparisons of the Catapú checklist are made with other checklists.

scholarly journals Spatial distribution of the daily precipitation concentration index in Algeria

2015 ◽  
Vol 15 (3) ◽  
pp. 617-625 ◽  
Author(s):  
A. Benhamrouche ◽  
D. Boucherf ◽  
R. Hamadache ◽  
L. Bendahmane ◽  
J. Martin-Vide ◽  
...  
Keyword(s):  
Concentration Index ◽  
Rainfall Intensity ◽  
Daily Precipitation ◽  
Temporal Distribution ◽  
Daily Rainfall ◽  
Precipitation Concentration Index ◽  
Precipitation Concentration ◽  
Northern Country ◽  
Torrential Rainfall ◽  
Erosive Capacity

Abstract. In this paper, the spatial and temporal distribution of the daily precipitation concentration index (CI) in Algeria (south Mediterranean Sea) has been assessed. CI is an index related to the rainfall intensity and erosive capacity; therefore, this index is of great interest for studies on torrential rainfall and floods. Forty-two daily rainfall series based on high-quality and fairly regular rainfall records for the period from 1970 to 2008 were used. The daily precipitation CI results allowed the identification of three climate zones: the northern country, characterized by coastal regions with CI values between 0.59 and 0.63; the highlands, with values between 0.57 and 0.62, except for the region of Biskra (CI = 0.70); and the southern region of the country, with high rainfall concentrations with values between 0.62 and 0.69.

scholarly journals Spatial Characteristics of Precipitation in the Greater Sydney Metropolitan Area as Revealed by the Daily Precipitation Concentration Index

Atmosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 627
Author(s):  
Kevin K. W. Cheung ◽  
Aliakbar. A. Rasuly ◽  
Fei Ji ◽  
Lisa T.-C. Chang
Keyword(s):  
Spatial Distribution ◽  
Metropolitan Area ◽  
Concentration Index ◽  
Daily Precipitation ◽  
Thunderstorm Activity ◽  
Kriging Interpolation ◽  
Precipitation Concentration Index ◽  
Blue Mountains ◽  
Precipitation Concentration ◽  
Cross Covariance

In this study; the spatial distribution of the Daily Precipitation Concentration Index (DPCI) has been analyzed inside the Greater Sydney Metropolitan Area (GSMA). Accordingly, the rainfall database from the Australian Bureau of Meteorology archive was utilized after comprehensive quality control. The compiled data contains a set of 41 rainfall stations indicating consistent daily precipitation series from 1950 to 2015. In the analysis of the DPCI across GSMA the techniques of Moran’s Spatial Autocorrelation has been applied. In addition, a cross-covariance method was applied to assess the spatial interdependency between vector-based datasets after performing an Ordinary Kriging interpolation. The results identify four well-recognized intense rainfall development zones: the south coast and topographic areas of the Illawarra district characterized by Tasman Sea coastal regions with DPCI values ranging from 0.61 to 0.63, the western highlands of the Blue Mountains, with values between 0.60 and 0.62, the inland regions, with lowest rainfall concentrations between 0.55 and 0.59, and lastly the districts located inside the GSMA with DPCI ranging 0.60 to 0.61. Such spatial distribution has revealed the rainstorm and severe thunderstorm activity in the area. This study applies the present models to identify the nature and mechanisms underlying the distribution of torrential rains over space within the metropolis of Sydney, and to monitor any changes in the spatial pattern under the warming climate.

scholarly journals Daily Precipitation Concentration in Central Coast Vietnam

2021 ◽  
Author(s):  
Aziz Benhamrouche ◽  
Javier Martin-Vide ◽  
Quoc Bao Pham ◽  
Mostefa E. Kouachi ◽  
M. Carmen Moreno-Garcia
Keyword(s):  
Exponential Distribution ◽  
Frequency Distribution ◽  
Linear Correlation ◽  
Concentration Index ◽  
Daily Precipitation ◽  
Central Coast ◽  
Cumulative Percentage ◽  
Precipitation Concentration ◽  
Negative Exponential Distribution ◽  
Negative Exponential

Abstract Empirical frequency distribution of daily precipitation amounts can be fitted by a negative exponential distribution, because anywhere there are many small daily totals and few large ones. Therefore, the cumulative percentages of days with precipitation, sorted in increasing order according to their amounts, against the cumulative percentage of the rainfall amounts that they contribute are fitted by positive exponential curves Y = aX, a and b constants. Based on these curves, the Concentration Index (CI) evaluates the contribution of the rainiest days to the total amount. In this study the CI has been calculated for 15 meteorological stations in Da Nang city and Quang Nam province in Central Coast Vietnam, for the 1979–2016 period. The results show high values of CI, ranging from 0.62 to 0.72. Conversely, the linear correlation between altitude and CI is negative (R=-0.60, p < 0.01). There are no correlations between the latitude nor the annual mean number of precipitation days and the CI. CI change for the sub-periods of 1979–1997 and 1998–2016 is also analyzed.

scholarly journals POTENCIAL DA NASCENTE DO RIO VIEIRA E ENTORNO: uma interpretação da Geodiversidade

2020 ◽  
Vol 15 (02) ◽  
pp. 291-316
Author(s):  
Rachel Inêz Castro Oliveira
Keyword(s):  
Methodological Approach ◽  
Field Work ◽  
Minas Gerais ◽  
Future Research ◽  
The North ◽  
Palabras Clave ◽  
Surrounding Areas ◽  
Del Rio ◽  
Water Springs ◽  
Water Spring

Este artigo contempla o aproveitamento dos elementos geológicos, geomorfológicos, espeleológicos, pedológicos e hidrográficos que compõem a geodiversidade como recurso educativo, turístico e interpretativo, em uma das principais nascentes do Rio Vieira e entorno, no município de Montes Claros, Norte de Minas Gerais. Considerando a especificidade desse campo da geodiversidade, o objetivo foi investigar as potencialidades da nascente do Rio Vieira e entorno, por meio do inventário dos elementos representativos da geodiversidade. A abordagem metodológica consistiu em fases concomitantes: levantamento bibliográfico, trabalhos de campo e elaboração de mapas. A área de estudo foi inventariada, caracterizando a geodiversidade local. As inferências e constatações produzidas possibilitaram compreender que existe potencial da nascente do Rio Vieira e entorno para a interpretação da geodiversidade. Espera-se que este estudo contribua fornecendo subsídios para que mais pesquisas sejam realizadas na área. Palavras-chave: Geodiversidade; Montes Claros; Rio Vieira.   POTENTIAL FOR THE WATER SPRING OF RIO VIEIRA AND ITS SURROUNDINGS: an interpretation of Geodiversity Abstract This paper considers the use of surveys in the fields of geology,geomorphology, speleology, pedology and hydrography, which make up geodiversity, as educational, touristic and interpretive resources in one of the main sources of Rio Vieira – which is located in the municipality of Montes Claros, in the north of the State of Minas Gerais - and its surroundings. Considering the specificity of this field of geodiversity, the objective of this study is to investigate the potentialities of the water springs of Rio Vieira and its surrounding areas through the inventory of geodiversity representative elements. The methodological approach consisted of concomitant phases: bibliographic survey, field work and mapping. The chosen area was inventoried, and local geodiversity was characterized.The inferences that have been drawn as well as the researcher´s findings made it possible to conclude that there is potential for the water spring of Rio Vieira and its surroundings to be perceived as geodiversity elements. It is expected that this work can contribute to other studies by providing them with subsidies and that a number of future research may be carried out in the area. Keywords: Geodiversity; Montes Claros; Rio Vieira.   POTENCIAL DE LA NASCENTE DEL RIO VIEIRA Y ENTORNO: una interpretación de la Geodiversidad Resumen Este artículo contempla el aprovechamiento de los elementos geológicos, geomorfológicos, espeleológicos, pedregales e hidrográficos que componen la geodiversidad como recurso educativo, turístico e interpretativo, en una de las principales nacientes del río Vieira y entorno, en el municipio de Montes Claros, Norte de Minas Gerais. Considerando la especificidad de ese campo de la geodiversidad, el objetivo fue investigar las potencialidades de la naciente del río Vieira y entorno, a través del inventario de los elementos representativos de la geodiversidad. El enfoque metodológico consistió en fases concomitantes: levantamiento bibliográfico, trabajos de campo y elaboración de mapas. El área de estudio fue inventariada, caracterizando la geodiversidad local. Las inferencias y constataciones producidas posibilitaron comprender que existe potencial de la naciente del Río Vieira y entorno para la interpretación de la geodiversidad. Se espera que este estudio contribuya proporcionando subsidios para que más investigaciones se realicen en el área. Palabras clave: Geodiversidad; Montes Claros; Río Vieira.

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