Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity
ABSTRACT The semi-arid region in the northeast of Brazil is characterised by rains of high intensity and short duration, with the processes of erosion being aggravated by an inappropriate land-use model. In this region, the lack of measured data for runoff and sediment yield increases the need to ap...
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| Format: | Article |
| Language: | English |
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Universidade Federal do Ceará
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| Series: | Revista Ciência Agronômica |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100049&lng=en&tlng=en |
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| author | Julio Cesar Neves dos Santos Eunice Maia de Andrade Pedro Henrique Augusto Medeiros Helba Araújo de Queiroz Palácio José Ribeiro de Araújo Neto |
| author_facet | Julio Cesar Neves dos Santos Eunice Maia de Andrade Pedro Henrique Augusto Medeiros Helba Araújo de Queiroz Palácio José Ribeiro de Araújo Neto |
| author_sort | Julio Cesar Neves dos Santos |
| collection | DOAJ |
| description | ABSTRACT The semi-arid region in the northeast of Brazil is characterised by rains of high intensity and short duration, with the processes of erosion being aggravated by an inappropriate land-use model. In this region, the lack of measured data for runoff and sediment yield increases the need to apply hydro-sedimentological models in estimating erosion, requiring knowledge of the actual sediment delivery ratio for the region. The aim of this study therefore, was to map soil erosion, making use of the Universal Soil Loss Equation (USLE), in the Iguatu Experimental Watershed (IEW). The mean annual sediment delivery ratio (SDR), and the SDR for individual events, was calculated from hydro-sedimentological measurements, contributing to an understanding of the processes of sediment propagation in the Brazilian semi-arid region, allowing identification of areas susceptible to water erosion. The IEW has an area of 16.74 km2 and is equipped with sensors for the continuous measurement of rainfall, flow and sediment yield. The mean annual SDR for the IEW was 0.37%. The SDR for individual rainfall events ranged from 0.08 to 1.67%, with an average of 0.68%. Among the main variables that influence the SDR for individual events is the magnitude of rainfall depth and antecedent soil moisture that can be better represented by the total antecedent precipitation of the previous 15 days. According to maps of soil loss, only 6.27% of the watershed presented losses beyond tolerable limits. |
| first_indexed | 2024-04-13T02:02:17Z |
| format | Article |
| id | doaj.art-054acd4947564e5da1eae99b4e1a3bcc |
| institution | Directory Open Access Journal |
| issn | 1806-6690 |
| language | English |
| last_indexed | 2024-04-13T02:02:17Z |
| publisher | Universidade Federal do Ceará |
| record_format | Article |
| series | Revista Ciência Agronômica |
| spelling | doaj.art-054acd4947564e5da1eae99b4e1a3bcc2022-12-22T03:07:34ZengUniversidade Federal do CearáRevista Ciência Agronômica1806-6690481495810.5935/1806-6690.20170006S1806-66902017000100049Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivityJulio Cesar Neves dos SantosEunice Maia de AndradePedro Henrique Augusto MedeirosHelba Araújo de Queiroz PalácioJosé Ribeiro de Araújo NetoABSTRACT The semi-arid region in the northeast of Brazil is characterised by rains of high intensity and short duration, with the processes of erosion being aggravated by an inappropriate land-use model. In this region, the lack of measured data for runoff and sediment yield increases the need to apply hydro-sedimentological models in estimating erosion, requiring knowledge of the actual sediment delivery ratio for the region. The aim of this study therefore, was to map soil erosion, making use of the Universal Soil Loss Equation (USLE), in the Iguatu Experimental Watershed (IEW). The mean annual sediment delivery ratio (SDR), and the SDR for individual events, was calculated from hydro-sedimentological measurements, contributing to an understanding of the processes of sediment propagation in the Brazilian semi-arid region, allowing identification of areas susceptible to water erosion. The IEW has an area of 16.74 km2 and is equipped with sensors for the continuous measurement of rainfall, flow and sediment yield. The mean annual SDR for the IEW was 0.37%. The SDR for individual rainfall events ranged from 0.08 to 1.67%, with an average of 0.68%. Among the main variables that influence the SDR for individual events is the magnitude of rainfall depth and antecedent soil moisture that can be better represented by the total antecedent precipitation of the previous 15 days. According to maps of soil loss, only 6.27% of the watershed presented losses beyond tolerable limits.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100049&lng=en&tlng=enSediment yieldSoil erosionUSLESDR |
| spellingShingle | Julio Cesar Neves dos Santos Eunice Maia de Andrade Pedro Henrique Augusto Medeiros Helba Araújo de Queiroz Palácio José Ribeiro de Araújo Neto Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity Revista Ciência Agronômica Sediment yield Soil erosion USLE SDR |
| title | Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity |
| title_full | Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity |
| title_fullStr | Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity |
| title_full_unstemmed | Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity |
| title_short | Sediment delivery ratio in a small semi-arid watershed under conditions of low connectivity |
| title_sort | sediment delivery ratio in a small semi arid watershed under conditions of low connectivity |
| topic | Sediment yield Soil erosion USLE SDR |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100049&lng=en&tlng=en |
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