Caracterização de padrões de chuvas ocorrentes em Santa Maria (RS)

Mehl, H. U.; Eltz, Flávio Luiz Foletto; Reichert, José Miguel; Didoné, I. A.

doi:10.1590/s0100-06832001000200023

Cited by 30 publications

(32 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Erosive rainfall events were separated in different patterns, according to the classification proposed by Horner & Jens (1941) and modified by Mehl et al (2001), by which rainfall events are classified in advanced, intermediate and delayed patterns, based on the moment of peak precipitation intensity. The rainfall pattern was considered advanced when the intensity peaked in the first 30 % of the total rainfall duration; intermediate, when the highest intensity occurred within 30 and 60 % of the total rainfall duration; and delayed, when the intensity peaked during the period after 60 % of the total duration; the pattern was considered constant, when the intensity was constantly maintained throughout the entire event.…”

Section: Thementioning

confidence: 99%

Soil losses from typic cambisols and red latosol as related to three erosive rainfall patterns

Aquino

Silva

Freitas

et al. 2013

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

SUMMARYRainfall erosivity is one of the main factors related to water erosion in the tropics. This work focused on relating soil loss from a typic dystrophic Tb Haplic Cambisol (CXbd) and a typic dystrophic Red Latosol (LVdf) to different patterns of natural erosive rainfall. The experimental plots of approximately 26 m 2 (3 x 8.67 m) consisted of a CXbd area with a 0.15 m m -1 slope and a LVdf area with 0.12 m m -1 slope, both delimited by galvanized plates. Drainpipes were installed at the lower part of these plots to collect runoff, interconnected with a Geib or multislot divisor. To calculate erosivity (EI 30 ), rainfall data, recorded continuously at a weather station in Lavras, were used. The data of erosive rainfall events were measured (10 mm precipitation intervals, accuracy 0.2 mm, 24 h period, 20 min intervals), characterized as rainfall events with more than 10 mm precipitation, maximum intensity > 24 mm h -1 within 15 min, or kinetic energy > 3.6 MJ, which were used in this study to calculate the rainfall erosivity parameter, were classified according to the moment of peak precipitation intensity in advanced, intermediate and delayed patterns. Among the 139 erosive rainfall events with CXbd soil loss, 60 % were attributed to the advanced pattern, with a loss of 415.9 Mg ha -1 , and total losses of 776.0 Mg ha -1 . As for the LVdf, of the 93 erosive rainfall events with soil loss, 58 % were listed in the advanced pattern, with 37.8 Mg ha -1 soil loss and 50.9 Mg ha -1 of total soil loss. The greatest soil losses were observed in the advanced rain pattern, especially for the CXbd. From the Cambisol, the soil loss per rainfall event was greatest for the advanced pattern, being influenced by the low soil permeability.Index terms: rainfall erosivity, water erosion, kinetic energy, soil erodibility.( RESUMO: PERDAS DE SOLO EM CAMBISSOLO E LATOSSOLO VERMELHO, EM RELAÇÃO A TRÊS PADRÕES DE CHUVAS EROSIVAS

show abstract

Section: Thementioning

confidence: 99%

Soil losses from typic cambisols and red latosol as related to three erosive rainfall patterns

Aquino

Silva

Freitas

et al. 2013

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

“…As chuvas foram caracterizadas por Horner & Jens (1942) em padrões hidrológicos denominados avançados, intermediários e atrasados, respectivamente, quando o pico de maior intensidade da chuva ocorre no primeiro terço, no segundo terço e no terceiro terço do período de duração total da chuva. No Rio Grande do Sul os padrões hidrológicos foram caracterizados por Mehl et al (2001) em Santa Maria, por Peñalva-Bazzano et al (2007) em Quaraí, por Cassol et al (2007) em Ijuí, por Cassol et al (2008) O objetivo do presente trabalho foi determinar o potencial erosivo das chuvas pelo índice EI 30 , com base em um período de 31 anos (1958 a 1988), estimando o valor do fator "R" para utilização na Equação Universal de Perdas de Solo, seus padrões hidrológicos e o período de retorno das chuvas erosivas para a região de Encruzilhada do Sul.…”

Section: Introductionunclassified

Potencial erosivo e características das chuvas de Encruzilhada do Sul, RS

Eltz

Cassol

Pascotini

2011

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

RESUMOO objetivo deste trabalho foi determinar a erosividade e algumas características das chuvas de Encruzilhada do Sul, com base no período de 1958 a 1988. Para cada chuva considerada erosiva e com base nos pluviogramas diários, foram digitados a hora e o volume acumulado, sendo os dados processados pelo programa computacional CHUVEROS, que calcula o índice EI 30 , os totais mensais e anuais, determinando também os padrões hidrológicos das chuvas. O coeficiente de chuvas, o período de retorno e a probabilidade de ocorrência, também foram calculados. O período de janeiro a março concentra 38% da erosividade anual, com pico maior em fevereiro (808,5 MJ mm ha -1 h -1 ), enquanto de julho a setembro concentra o período com menor potencial erosivo (14%). Na média, os padrões avançado, intermediário e atrasado têm 48, 26 e 26% do número de chuvas erosivas, perfazendo 51, 27 e 22% do volume médio anual e 55, 27 e 18% da erosividade média anual. Para Encruzilhada do Sul o valor do índice de erosividade anual é de 5534,3 MJ mm ha -1 h -1 (Fator "R" da USLE), com período de retorno de 2,3 anos e probabilidade de ocorrência de 40,6%. Verificou-se que o potencial erosivo das chuvas (EI 30 ) não apresenta correlação significativa com o coeficiente de chuvas.Palavras-chave: potencial erosivo da chuva, índice EI 30 , energia cinética, fator R Erosivity potential and characteristics of rainfalls at Encruzihada do Sul, RS ABSTRACT The objective of this work was to determine the rainfall erosivity and some characteristics of erosive rainfalls of Encruzilhada do Sul (RS, Brazil), based on the period of 1958 to 1988. For each erosive rainfall, based on daily rainfall charts, the hour and amounts were digited, and processed by the software Chuveros, which calculates the EI 30 index, the monthly and annual totals, besides to determine the hydrological pattern of each rainfall. The rainfall coefficient, the return period and its occurrence probability were also calculated. The January to March period concentrates 38% of annual erosivity, with highest peak in February (808.5 MJ mm ha -1 h -1 ), while July to September concentrates the smallest erosive potential (14%). In the average, the advanced, intermediary and delayed patterns present 48, 26 and 26% of the number of erosive rainfalls per year, respectively, correponding to 51, 27 and 22%, respectively, of the annual volume of erosive rainfalls and 55, 27 and 18% of the average annual erosivity. For Encruzilhada do Sul, the mean annual rainfall erosivity index is 5534.3 MJ mm ha -1 h -1 ("R" Factor of USLE), with a return period of 2.3 years, and occurrence probability of 40.6%. It has been verified that the rainfall erosive potential (EI 30 ) does not present significant correlation to the rainfall coefficient.

show abstract

“…The remaining erosive rainfall matched the intermediate and late patterns, with 25% for each. Researchers in other parts of Brazil, such as Lavras in Minas Gerais and Santa Maria in Rio Grande do Sul, obtained similar results (under natural rainfall) with the highest incidence of rainfall being of the early-pattern type (Mehl et al, 2001;Evangelista et al, 2005).…”

Section: Resultsmentioning

confidence: 68%

“…To determine rainfall patterns, the methodology developed by Mehl et al (2001) was used. This methodology works using three rainfall patterns: early (EA) intermediate (IN) and late (LA), according to the position of the peak of greatest intensity (maximum intensity over 5 min -I 5 max) in relation to the total time of the event.…”

Section: Methodsmentioning

confidence: 99%

Characteristics of rainfall and erosion under natural conditions of land use in semiarid regions

Lima

Palácio²,

Andrade

et al. 2013

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

The characteristics of rainfall can provide important information for management and land use may also minimize the water erosion problems. This study was carried out to evaluate soil and water loss in erosion plots with different coverage, and the interference of natural rainfall characteristics on these processes. The experiment was carried out during the rainy season in the years of 2009 and 2010, on three erosion plots, each of 20 m 2 , and under different land use conditions: native 'caatinga', thinned 'caatinga' and natural herbaceous cover. The rainfall was classified into three different rainfall patterns, characterized as early, intermediate and late. The predominant rainfall pattern for the two years under study was early rainfall with 47.6%, followed by intermediate and late with 30.5% and 22%, respectively. The smallest soil losses for the entire studied period were recorded for the native 'caatinga' plot, demonstrating the protective effect of vegetation on sediment production. Despite the early rainfall pattern being prevalent in the period of study, this was not the main factor responsible for water and soil loss.Key words: rainfall intensity, erosivity, water erosion Características das chuvas e da erosão sob condições naturais de usos do solo no semiárido RESUMO As características das chuvas podem não apenas fornecer informações importantes no que diz respeito ao uso e manejo do solo, mas também minimizar os problemas causados pela erosão hídrica. Neste sentido, objetivou-se avaliar as perdas de solo e água em parcelas de erosão com diferentes coberturas e a interferência das características das chuvas naturais nesses processos. O experimento foi conduzido durante a estação chuvosa dos anos de 2009 e 2010 em três parcelas de erosão de 20 m², submetidas a diferentes condições de uso do solo: Caatinga nativa, Caatinga raleada e cobertura herbácea natural. As chuvas foram classificadas em três diferentes padrões de precipitação caracterizados como avançado, intermediário e atrasado. O padrão de chuva predominante para os dois anos de estudo foi o avançado, com 47,6% do total de eventos, seguido pelo intermediário e atrasado com 30,5 e 22%, respectivamente. Para todo o período estudado as menores perdas de solo foram registradas na Caatinga nativa caracterizando o efeito protetor da cobertura vegetal quanto à produção de sedimentos. Apesar do padrão de chuva avançada ter sido predominante para o período estudado, este não foi o principal fator responsável pelas perdas de água e solo. Palavras-chave: intensidade das chuvas, erosividade, erosão hídricaRevista Brasileira de Engenharia Agrícola e Ambiental

show abstract

Caracterização de padrões de chuvas ocorrentes em Santa Maria (RS)

Cited by 30 publications

References 7 publications

Soil losses from typic cambisols and red latosol as related to three erosive rainfall patterns

Soil losses from typic cambisols and red latosol as related to three erosive rainfall patterns

Potencial erosivo e características das chuvas de Encruzilhada do Sul, RS

Characteristics of rainfall and erosion under natural conditions of land use in semiarid regions

Contact Info

Product

Resources

About