One- And Two-Dimensional Ecohydraulic Modeling of Formoso River (Mg)

Abstract

ABSTRACT:The objective of this study was to compare ecohydrological simulations from a onedimensional model (PHABSIM -Physical Habitat Simulation System) and a two-dimensional model (River2D) in order to indicate a reliable tool that could be used to determine public policies for the sustainable management of the water resources of the Formoso River basin (MG). The results from the calibration of hydraulic variables, namely, water depth and velocity, as well as habitat predictions for three fish species of the river were compared. The results showed that River2D was best suited to simulate ecohydrological features for the studied river stretch. Although PHABSIM presented a better fit of the hydraulic variables at the calibration process, the use of only three monitoring cross sections to compose the biotic model database compromised its habitat modeling. PHABSIM model was not able to accurately assess the actual characteristics of the physical habitat in the segments of the river located between the monitoring cross sections.

Downstream alterations on hydrodynamic fields by hydropower plant operations: implications for upstream fish migration

“…The 2D models can be created and ran faster than 3D models though the latter has the ability to model vertical nearbed flows (Kasvi et al, 2015) and turbulence (Alvarez et al, 2017), which has already been described as an important hydraulic variable linked to fish swimming capacity (Lacey et al, 2012). The uncertainties showed in the validation process are consistent with values reported for similar studies in the literature (Jowett & Duncan, 2012;Oliveira et al, 2016;Gisen et al 2017). The underestimation of flow velocity by the 3D model could be improved in future studies by adopting a longer simulated reach as well as the application of grid convergence for both models.…”

“…We considered the model to be calibrated because the adjustment was similar to the adjustments of other studies that modeled the smallest reaches of the other basins at lowest discharges: depth MAE equal to 22% and velocity MAE equal to 34% for a simulation with a discharge below 40 m 3 /s (Jowett & Fig. 6 Positions of cross-section in the tailrace, vector and velocity magnitude field in ADCP profile and 3D model Duncan, 2012); depth MAE equals 13.4% and velocity MAE equals 21.2% for discharges below 6.41 m 3 /s (Oliveira et al, 2016).…”

The impact of floods triggered by natural dam breakage on the adaptability of downstream river fish—the 2018 baige outburst flood in the upper reaches of the Yangtze river in China

“…River2D is a two-dimensional model of habitat simulation designed specifically for natural streams and rivers. It is a finite element method model that is now used in various studies and works around the world (Lu et al, 2021;Oliveira et al, 2016;Blackburn and She, 2021). The software uses the shallow water equation to analyse the flow hydrodynamic characteristics in the river channel.…”

“…Among them, the continuity equation and momentum equation constitute governing equations. These equations include the water continuity equation and the kinetic energy conservation equation in the x and y directions (Oliveira et al, 2016;Baek et al, 2021).…”

Simulation of physical habitat in Ayuquila-Armeria river in the west of Mexico

“…phabsim y River2D son empleados en la Instream Flow Incremental Methodology (ifim) [26], y quizás son los procedimientos más conocidos y documentados para la planificación de los recursos hídricos [3]. Estos modelos simulan el hábitat idóneo en las corrientes de agua, y los resultados se muestran en valores de hábitat potencial útil (hpu), que representa el área utilizable de hábitat idóneo para las especies acuáticas en los tramos de interés [27].…”