Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method
ABSTRACT The flow regulation that results from the implantation of dams causes consequences to the river ecosystems due to the modification on the characteristics of the hydrologic regime. The investigation of these changes become relevant, mainly in semi-arid regions where there is a great amount o...
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Associação Brasileira de Recursos Hídricos
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| Series: | Revista Brasileira de Recursos Hídricos |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312017000100209&lng=en&tlng=en |
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| author | Naiah Caroline Rodrigues de Souza Andrea Sousa Fontes Lafayette Dantas da Luz Sandra Maria Conceição Pinheiro |
| author_facet | Naiah Caroline Rodrigues de Souza Andrea Sousa Fontes Lafayette Dantas da Luz Sandra Maria Conceição Pinheiro |
| author_sort | Naiah Caroline Rodrigues de Souza |
| collection | DOAJ |
| description | ABSTRACT The flow regulation that results from the implantation of dams causes consequences to the river ecosystems due to the modification on the characteristics of the hydrologic regime. The investigation of these changes become relevant, mainly in semi-arid regions where there is a great amount of these hydraulic structures and lack of such analyzes. Considering the above, this paper aims to evaluate the Dundee Hydrological Regime Alteration Method (DHRAM) through the classification of the degree of impact of dams located on rivers Itapicuru, Paraguaçu and their tributaries, verifying the adequacy of its use to represent the semi-arid hydrologic regime. Thereby, the DHRAM was applied in three versions: considering the thresholds that define the scores to classify the degree of impact in its original set (accordingly to Black et al. (2005)); with the adjustment of those thresholds to local conditions; and, with the regrouping of variables and adjustment of thresholds. The results showed that the method in its original set is applicable to semi-arid rivers, however it tends to be very restrictive against the high natural hydrologic variability characteristic of these rivers, and it ends up pointing to a high degree of alteration for dams that are known for not causing a very siginifcant flow regulation. The DHRAM with the regrouping of variables and the adjustment of thresholds presented the classification that approached the most to the known characteristics of the studied dams, being useful for the evaluation of the impact of dams still in project, and also to guide the adoption of operating rules that minimize the most significant hydrologic alterations that are identified. |
| first_indexed | 2024-12-24T04:40:22Z |
| format | Article |
| id | doaj.art-845231f7e7064932bed1692ee9235ee9 |
| institution | Directory Open Access Journal |
| issn | 2318-0331 |
| language | English |
| last_indexed | 2024-12-24T04:40:22Z |
| publisher | Associação Brasileira de Recursos Hídricos |
| record_format | Article |
| series | Revista Brasileira de Recursos Hídricos |
| spelling | doaj.art-845231f7e7064932bed1692ee9235ee92022-12-21T17:14:52ZengAssociação Brasileira de Recursos HídricosRevista Brasileira de Recursos Hídricos2318-03312210.1590/2318-0331.011716093S2318-03312017000100209Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM methodNaiah Caroline Rodrigues de SouzaAndrea Sousa FontesLafayette Dantas da LuzSandra Maria Conceição PinheiroABSTRACT The flow regulation that results from the implantation of dams causes consequences to the river ecosystems due to the modification on the characteristics of the hydrologic regime. The investigation of these changes become relevant, mainly in semi-arid regions where there is a great amount of these hydraulic structures and lack of such analyzes. Considering the above, this paper aims to evaluate the Dundee Hydrological Regime Alteration Method (DHRAM) through the classification of the degree of impact of dams located on rivers Itapicuru, Paraguaçu and their tributaries, verifying the adequacy of its use to represent the semi-arid hydrologic regime. Thereby, the DHRAM was applied in three versions: considering the thresholds that define the scores to classify the degree of impact in its original set (accordingly to Black et al. (2005)); with the adjustment of those thresholds to local conditions; and, with the regrouping of variables and adjustment of thresholds. The results showed that the method in its original set is applicable to semi-arid rivers, however it tends to be very restrictive against the high natural hydrologic variability characteristic of these rivers, and it ends up pointing to a high degree of alteration for dams that are known for not causing a very siginifcant flow regulation. The DHRAM with the regrouping of variables and the adjustment of thresholds presented the classification that approached the most to the known characteristics of the studied dams, being useful for the evaluation of the impact of dams still in project, and also to guide the adoption of operating rules that minimize the most significant hydrologic alterations that are identified.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312017000100209&lng=en&tlng=enhydrologic indicatorsclassification of the degree of impactsemi-arid |
| spellingShingle | Naiah Caroline Rodrigues de Souza Andrea Sousa Fontes Lafayette Dantas da Luz Sandra Maria Conceição Pinheiro Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method Revista Brasileira de Recursos Hídricos hydrologic indicators classification of the degree of impact semi-arid |
| title | Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method |
| title_full | Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method |
| title_fullStr | Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method |
| title_full_unstemmed | Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method |
| title_short | Identification of the degree of impact of dams on the hydrologic regime of semi-arid rivers: an evaluation of the DHRAM method |
| title_sort | identification of the degree of impact of dams on the hydrologic regime of semi arid rivers an evaluation of the dhram method |
| topic | hydrologic indicators classification of the degree of impact semi-arid |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2318-03312017000100209&lng=en&tlng=en |
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