TY - JOUR
T1 - LABORATORY INVESTIGATION ON BED-SHEAR STRESS PARTITIONING IN VEGETATED FLOWS
AU - Munar-Martinez, Mateo
AU - Vargas-Luna, Andrés
AU - Torres, Andrés
N1 - Publisher Copyright:
© 2019, IAHR.
PY - 2019
Y1 - 2019
N2 - Vegetation exerts a strong control in the morphological evolution of fluvial systems. It is therefore important to include the effects of vegetation in fluvial studies and numerical models. By assuming a momentum conservation balance, a common way to analyze the flow resistance in vegetated channels splits the total shear stress, tv, into shear stress due to vegetation (or vegetation drag), tv, and bed-shear stress, tb. However, there are no methodologies available to reduce the contribution of each bed-shear stress component, bed and vegetation, when the vegetation is sparse or dense. To study the latter effect, this work is based on an intense experimental investigation. The laboratory experiments were carried out in a tilting flume, using rigid vegetation at three different densities and considering submerged hydraulic conditions. The results of this investigation show that the bed-shear stress contribution reduces considerably in configurations where dense vegetation is present. A method to consider this reduction is proposed and tested with data gathered from the literature.
AB - Vegetation exerts a strong control in the morphological evolution of fluvial systems. It is therefore important to include the effects of vegetation in fluvial studies and numerical models. By assuming a momentum conservation balance, a common way to analyze the flow resistance in vegetated channels splits the total shear stress, tv, into shear stress due to vegetation (or vegetation drag), tv, and bed-shear stress, tb. However, there are no methodologies available to reduce the contribution of each bed-shear stress component, bed and vegetation, when the vegetation is sparse or dense. To study the latter effect, this work is based on an intense experimental investigation. The laboratory experiments were carried out in a tilting flume, using rigid vegetation at three different densities and considering submerged hydraulic conditions. The results of this investigation show that the bed-shear stress contribution reduces considerably in configurations where dense vegetation is present. A method to consider this reduction is proposed and tested with data gathered from the literature.
KW - Vegetated flows
KW - laboratory experiments
KW - rigid vegetation
KW - shear-stress partitioning
UR - http://www.scopus.com/inward/record.url?scp=85167819740&partnerID=8YFLogxK
U2 - 10.3850/38WC092019-0438
DO - 10.3850/38WC092019-0438
M3 - Conference article
AN - SCOPUS:85167819740
SN - 2521-7119
SP - 5610
EP - 5617
JO - Proceedings of the IAHR World Congress
JF - Proceedings of the IAHR World Congress
T2 - 38th IAHR World Congress, 2019
Y2 - 1 September 2019 through 6 September 2019
ER -