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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Experimental investigation of gabion broad-crested weirs under upstream partial blockage conditions
The attention of researchers and engineers has been attracted to gabion weirs due to their environmental, hydraulic, and stability capabilities compared with solid weirs. One of the possible problems of the weirs is the partial blockage caused by sedimentation upstream of them. This research experiment investigates the hydraulic performance of gabion broad-crested weirs (GBCWs) with an upstream partial blockage. For this purpose, a total of 147 experiments were studied with different conditions for free-flow conditions. The weirs were tested with five partial blockage conditions between 0% and 100% of the weir height (0, 0.25P, 0.5P, 0.75P, and P). The results showed that increasing the partial blockage decreases the discharge coefficient. The changes in the discharge coefficients are minor for partial blockage less than 0.25P, and for partial blockage greater than 0.5P, the discharge coefficients are significantly reduced. As the partial blockage increases, the effect of filling-material size in gabion weirs decreases. Finally, a relationship was developed using the nonlinear regression analysis approach to estimate the discharge coefficient in the GBCWs with partial blockage. HIGHLIGHTS This paper aims to study the effect of partial blockage upstream of a gabion broad-crested weir on its hydraulic performance.; The occurrence of blockage upstream of weirs has changed their hydraulic performance, and this phenomenon should be considered in the design phase, especially in flood-prone waterways.; A review of the research background shows that this phenomenon in gabion weirs has not been evaluated. Therefore, this research has been done to cover this gap.; Empirical relationships were extracted based on the nonlinear regression method to calculate the discharge coefficient of GBCWs with partial blockage.;
Experimental investigation of gabion broad-crested weirs under upstream partial blockage conditions
The attention of researchers and engineers has been attracted to gabion weirs due to their environmental, hydraulic, and stability capabilities compared with solid weirs. One of the possible problems of the weirs is the partial blockage caused by sedimentation upstream of them. This research experiment investigates the hydraulic performance of gabion broad-crested weirs (GBCWs) with an upstream partial blockage. For this purpose, a total of 147 experiments were studied with different conditions for free-flow conditions. The weirs were tested with five partial blockage conditions between 0% and 100% of the weir height (0, 0.25P, 0.5P, 0.75P, and P). The results showed that increasing the partial blockage decreases the discharge coefficient. The changes in the discharge coefficients are minor for partial blockage less than 0.25P, and for partial blockage greater than 0.5P, the discharge coefficients are significantly reduced. As the partial blockage increases, the effect of filling-material size in gabion weirs decreases. Finally, a relationship was developed using the nonlinear regression analysis approach to estimate the discharge coefficient in the GBCWs with partial blockage. HIGHLIGHTS This paper aims to study the effect of partial blockage upstream of a gabion broad-crested weir on its hydraulic performance.; The occurrence of blockage upstream of weirs has changed their hydraulic performance, and this phenomenon should be considered in the design phase, especially in flood-prone waterways.; A review of the research background shows that this phenomenon in gabion weirs has not been evaluated. Therefore, this research has been done to cover this gap.; Empirical relationships were extracted based on the nonlinear regression method to calculate the discharge coefficient of GBCWs with partial blockage.;
Experimental investigation of gabion broad-crested weirs under upstream partial blockage conditions
Sanaz Hasanian Shirvan (Autor:in) / Bahareh Pirzadeh (Autor:in) / Seyed Hosein Rajaei (Autor:in) / Mahmood Shafai Bejestan (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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