Geomorphology and rehabilitation of erosion-degraded areas using soil bioengineering in the Rio Bacanga basin, São Luís, Maranhão State

2.50
Hdl Handle:
http://hdl.handle.net/2436/131408
Title:
Geomorphology and rehabilitation of erosion-degraded areas using soil bioengineering in the Rio Bacanga basin, São Luís, Maranhão State
Authors:
Bezerra, José Fernando Rodrigues; Fullen, Michael A.; Guerra, Antonio J. T.
Other Titles:
Geomorfologia e reabilitação de áreas degradadas por erosão com técnicas de bioengenharia de solos na bacia do rio Bacanga, São Luís, Maranhão
Abstract:
The research analysed the geomorphological characteristics of the Bacanga basin of São Luís municipality. Basin characteristics were related to highly developed erosion processes. The approach considered the identification of environmental fragility classes, the monitoring of an experimental station and the rehabilitation of a degraded area using soil bioengineering techniques. The adopted methodological procedures included: 1. Cartographic and bibliographic surveys. 2. Mapping of the hypsometry, slope, land use, rainfall index and geomorphology of the Bacanga basin, along with analysis of the morphostructure and morphosculture of the Gulf of Maranhense and environmental fragility mapping. 3. Establishing an experimental station with two replicate erosion plots and measuring the following parameters: vegetation cover index, soil surface changes using erosion pins, soil matric potential, runoff and sediment loss. 4. The rehabilitation of Sacavém gully using soil bioengineering techniques (using geotextiles constructed from palm leaves of the Buriti tree). Mapping showed that identified gullies are located on the plateau edges of the basin and are very fragile environments. The greatest interval of vegetation cover index development was between February (0%) and March (33.35%) (both 2009), whereas the smallest difference was 5.31%, between May (75.88%) and June (both 2009) (81.19%). The difference of erosion/deposition pin data within the bare and vegetated soil plots was significant using the non-parametric Kruskal-Wallis test (P <0.001). The results obtained from tensiometers at 10, 20, 40 and 60 cm depth showed a significant difference (P <0.001) between the bare and geotextile-covered plots. Soil matric potential measurements indicate that geotextile plots had an improved soil water regime. Rainfall during the measuring period (February-June 2009) was 2,067.5 mm. This caused a total of 494.6 L m-2 runoff from the two bare plots and 208.6 L m-2 from the two geotextile plots. There were significant differences in soil loss between the plot treatments, demonstrating the effectiveness of geotextiles plus grass in decreasing erosion rates. The two bare soil plots lost a total of 4,391.0 g m-2 of sediment, while the geotextile plots lost 255.9 g m-2. Rehabilitation work on Sacavém gully showed that soil bioengineering was a very effective soil conservation technique.
Affiliation:
Federal University of Rio de Janeiro
Issue Date:
2011
URI:
http://hdl.handle.net/2436/131408
Type:
Thesis
Language:
other
Description:
Ph.D. thesis, Federal University of Rio de Janeiro (in Portuguese, with English Abstract) / Tese (Doutorado em Geografia), Programa de Pós-Graduação em Geografia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 250 pp. Director of Studies: Professor Antonio J.T. Guerra. Supervisor: Michael A. Fullen. Portuguese abstract in attached file.
Appears in Collections:
Plant and Environmental Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorBezerra, José Fernando Rodriguesen
dc.contributor.authorFullen, Michael A.en
dc.contributor.authorGuerra, Antonio J. T.en
dc.date.accessioned2011-05-24T10:10:11Z-
dc.date.available2011-05-24T10:10:11Z-
dc.date.issued2011-
dc.identifier.urihttp://hdl.handle.net/2436/131408-
dc.descriptionPh.D. thesis, Federal University of Rio de Janeiro (in Portuguese, with English Abstract) / Tese (Doutorado em Geografia), Programa de Pós-Graduação em Geografia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 250 pp. Director of Studies: Professor Antonio J.T. Guerra. Supervisor: Michael A. Fullen. Portuguese abstract in attached file.en
dc.description.abstractThe research analysed the geomorphological characteristics of the Bacanga basin of São Luís municipality. Basin characteristics were related to highly developed erosion processes. The approach considered the identification of environmental fragility classes, the monitoring of an experimental station and the rehabilitation of a degraded area using soil bioengineering techniques. The adopted methodological procedures included: 1. Cartographic and bibliographic surveys. 2. Mapping of the hypsometry, slope, land use, rainfall index and geomorphology of the Bacanga basin, along with analysis of the morphostructure and morphosculture of the Gulf of Maranhense and environmental fragility mapping. 3. Establishing an experimental station with two replicate erosion plots and measuring the following parameters: vegetation cover index, soil surface changes using erosion pins, soil matric potential, runoff and sediment loss. 4. The rehabilitation of Sacavém gully using soil bioengineering techniques (using geotextiles constructed from palm leaves of the Buriti tree). Mapping showed that identified gullies are located on the plateau edges of the basin and are very fragile environments. The greatest interval of vegetation cover index development was between February (0%) and March (33.35%) (both 2009), whereas the smallest difference was 5.31%, between May (75.88%) and June (both 2009) (81.19%). The difference of erosion/deposition pin data within the bare and vegetated soil plots was significant using the non-parametric Kruskal-Wallis test (P <0.001). The results obtained from tensiometers at 10, 20, 40 and 60 cm depth showed a significant difference (P <0.001) between the bare and geotextile-covered plots. Soil matric potential measurements indicate that geotextile plots had an improved soil water regime. Rainfall during the measuring period (February-June 2009) was 2,067.5 mm. This caused a total of 494.6 L m-2 runoff from the two bare plots and 208.6 L m-2 from the two geotextile plots. There were significant differences in soil loss between the plot treatments, demonstrating the effectiveness of geotextiles plus grass in decreasing erosion rates. The two bare soil plots lost a total of 4,391.0 g m-2 of sediment, while the geotextile plots lost 255.9 g m-2. Rehabilitation work on Sacavém gully showed that soil bioengineering was a very effective soil conservation technique.en
dc.language.isootheren
dc.subjectGeomorphologyen
dc.subjectGeotextilesen
dc.subjectGulliesen
dc.subjectRehabilitation worken
dc.subjectSoil bioengineeringen
dc.subjectGeomorfologiaen
dc.subjectVoçorocasen
dc.subjectGeotêxteisen
dc.subjectReabilitação e bioengenharia de solosen
dc.titleGeomorphology and rehabilitation of erosion-degraded areas using soil bioengineering in the Rio Bacanga basin, São Luís, Maranhão Stateother
dc.title.alternativeGeomorfologia e reabilitação de áreas degradadas por erosão com técnicas de bioengenharia de solos na bacia do rio Bacanga, São Luís, Maranhãoen
dc.typeThesisen
dc.contributor.departmentFederal University of Rio de Janeiroen
All Items in WIRE are protected by copyright, with all rights reserved, unless otherwise indicated.