16 documents found, page 1 of 2
The Influence of Soil and Vegetation on Hydrological Modeling in a Sub-Basin of...
Pereira, Débora; Oliveira, Ana R.; Ramos, Tiago B.; Rollnic, Marcelo; Neves, RamiroThis study analysis the impact of soil hydraulic parameters and canopy storage on hydrological modeling in a sub-basin of Araguaia River, Brazilian Cerrado, using the MOHID Land model. Parameters analyzed included vertical saturated hydraulic conductivity (Ks), saturated water content (Θs), residual water content (Θr), and canopy storage were analyzed for their effects on river discharge. The sensitivity analys...
Assessing the Impact of IrrigaSys Decision Support System on Farmers’ Irrigatio...
Darouich, Hanaa; Simionesei, Lucian; Oliveira, Ana R.; Neves, Ramiro; Ramos, Tiago B.The IrrigaSys decision support system (DSS) has supported farmers’ decision-making regarding irrigation scheduling in the Sorraia Valley irrigation district in Southern Portugal over a span of six years (2017–2022). This study aims to conduct a postevaluation of farmers’ adherence to the DSS, employing a multicriteria analysis (MCA) approach with data from the 2019 (driest year) and 2020 (average year) growing ...
Climatology and nutrient fluxes in the Tagus estuary: A coupled model application
de Pablo, Hilda; Sobrinho, João; Nunes, Susana; Correia, Alexandre; Neves, Ramiro; Gaspar, MiguelRivers are responsible for the main transport of nutrients from land to estuaries and coastal areas. Understanding the fate of these anthropogenic inputs and their impacts on estuaries and adjacent marine ecosystems is essential for the protection of coastal waters. Here, the 3D MOHID hydrodynamic model coupled with a biogeochemical model was used to determine seasonal nutrient fluxes between areas of the Tagus...
The influence of the river discharge on residence time, exposure time and integ...
de Pablo, Hilda; Sobrinho, João; Garaboa-Paz, Daniel; Fonteles, Caio; Neves, Ramiro; Gaspar, MiguelUnderstanding how long water is retained in an estuary and how quickly it is completely flushed is essential to estimate an estuary's health in areas with significant pollutant loadings. The present study analyses the effect of five different Tagus River discharge scenarios ranging from low to extreme on residence time (RT), exposure time (ET) and integrated water fractions inside pre-established Tagus estuary ...
Evaluation of the trophic status in a Mediterranean reservoir under climate cha...
Almeida, Carina; Branco, Paulo; Segurado, Pedro; Ramos, Tiago B.; Ferreira, Teresa; Neves, Ramiro; Oliveira, Rodrigo ProençaThis study describes an integrated modelling approach to better understand the trophic status of the Montargil reservoir (southern Portugal) under climate change scenarios. The SWAT and CE-QUAL-W2 models were applied to the basin and reservoir, respectively, for simulating water and nutrient dynamics while considering one climatic scenario and two decadal timelines (2025–2034 and 2055–2064). Model simulations s...
Exploring the Use of Vegetation Indices for Validating Crop Transpiration Fluxe...
Ramos, Tiago B.; Simionesei, Lucian; Oliveira, Ana R.; Neves, Ramiro; Darouich, HanaaThe success of an irrigation decision support system (DSS) much depends on the reliability of the information provided to farmers. Remote sensing data can expectably help validate that information at the field scale. In this study, the MOHID-Land model, the core engine of the IrrigaSys DSS, was used to simulate the soil water balance in an irrigated vineyard located in southern Portugal during three growing sea...
Modeling soil water dynamics and pasture growth in the montado ecosystem using ...
Simionesei, Lucian; Ramos, Tiago B.; Oliveira, Ana R.; Jongen, Marjan; Darouich, Hanaa; Weber, Kirsten; Proença, Vânia; Domingos, Tiago; Neves, RamiroThe southern Iberian Peninsula is characterized by evergreen oak woodlands (locally known as montado), which constitute an important savanna-type agro-silvo-pastoral ecosystem. This ecosystem is facing a progressive decline for several reasons, with the foremost being overgrazing. Better management tools are necessary to accurately quantify the systems’ carrying capacity and the sustainable stocking rates that ...
Water quantity and quality under future climate and societal scenarios: a basin...
Almeida, Carina; Ramos, Tiago B.; Segurado, Pedro; Branco, Paulo; Neves, Ramiro; Oliveira, Rodrigo ProençaWater resources are impacted by several stressors like over-population and over consumption that compromises their availability. These stressors are expected to progressively intensify due to climate change in most regions of the world, with direct impact on watersheds and river systems. This study investigates the effect of different watershed pressure scenarios due to climate change in the hydrological regime...
Assessing the impact of LAI data assimilation on simulations of the soil water ...
Ramos, Tiago B.; Simionesei, Lucian; Oliveira, Ana R.; Darouich, Hanaa; Neves, RamiroHydrological modeling at the catchment scale requires the upscaling of many input parameters for better characterizing landscape heterogeneity, including soil, land use and climate variability. In this sense, remote sensing is often considered as a practical solution. This study aimed to access the impact of assimilation of leaf area index (LAI) data derived from Landsat 8 imagery on MOHID-Land’s simulations of...
An integrated analysis of the eutrophication process in the Enxoé reservoir wit...
Ramos, Tiago B.; Darouich, Hanaa; Gonçalves, Maria C.; Brito, David; Castelo Branco, Maria A.; Martins, José C.; Fernandes, Manuel L.The Enxoé reservoir in southern Portugal has been exhibiting the highest trophic state in the country since its early years of operation. The problem has attracted water managers’ and researchers’ attention as the reservoir is the water supply for two municipalities. Extensive research was thus conducted over the last few years, including field monitoring and modelling at the plot, catchment, and reservoir scal...