6 documents found, page 1 of 1
Fluorescent quinine-based tracking techniques for measurement of open-channel s...
Zehsaz, Soheil; Lima, João L. M .P. de; Isidoro, Jorge M. G. P.; Lima, M. Isabel P. de; Martins, RicardoThis study presents techniques based on the use of fluorescent quinine as a visual tracer for surface flows, to assess surface flow velocities in channels and streams under low luminosity conditions. Fieldwork was conducted in three open channels, with different hydraulic characteristics. A quinine solution, in both liquid and solid (ice cube) forms, was applied on the water flow surface and an Unmanned Aerial ...
Comparison of ratioing and RCNA methods in the detection of flooded areas using...
Fernandez, Helena Maria; Granja-Martins, Fernando M.; Dziuba, Olga; Pereira, David A. B.; Isidoro, Jorge M. G. P.Climate change and natural disasters caused by hydrological, meteorological, and climatic phenomena have a significant impact on cities. Russia, a continental country with a vast territory of complex geographic–ecological environments and highly variable climatic conditions, is subject to substantial and frequent natural disasters. On 29 June 2019, an extreme precipitation event occurred in the city of Tulun in...
Using Quinine as a Fluorescent Tracer to Estimate Overland Flow Velocities on B...
Lima, João L. M. P. de; Zehsaz, Soheil; Lima, M. Isabel P. de; Isidoro, Jorge M. G. P.; Jorge, Romeu Gerardo; Martins, Ricardo GerardoThis study presents a tracer technique based on the fluorescent properties of quinine to help on the visualization of shallow flows and allow a quantitative measurement of overland flow velocities. Laboratory experiments were conducted to compare the traditional dye tracer and thermal tracer techniques with this novel fluorescent (quinine) tracer by injecting a quinine solution and the other tracers into shallo...
Using quinine as a fluorescent tracer to estimate overland flow velocities on b...
de Lima, João L. M. P.; Zehsaz, Soheil; de Lima, M. Isabel P.; Isidoro, Jorge M. G. P.; Jorge, Romeu Gerardo; Martins, RicardoThis study presents a tracer technique based on the fluorescent properties of quinine to help on the visualization of shallow flows and allow a quantitative measurement of overland flow velocities. Laboratory experiments were conducted to compare the traditional dye tracer and thermal tracer techniques with this novel fluorescent (quinine) tracer by injecting a quinine solution and the other tracers into shallo...
Mapping rainfall aggressiveness from physiographical data: application to the G...
Fernandez, Helena Maria; Granja-Martins, Fernando M.; Isidoro, Jorge M. G. P.The South of the Iberian Peninsula is subject to long periods of drought followed by heavy rain events over shallow soils, promoting soil loss. The Modified Fournier Index (MFI) is a good indicator of this process; however, MFI is sometimes difficult to assess due to the scarcity of rainfall data. This study proposes a methodology using MFI and supported by a geographic information system (GIS) and geostatistic...
Impacts of distinct spatial arrangements of impervious surfaces on runoff and s...
Ferreira, C. S. S.; Moruzzi, R.; Isidoro, Jorge M. G. P.; Tudor, M.; Vargas, M.; Ferreira, A. J. D.; de Lima, J. L. M. P.Urbanization affects runoff processes and sediment transport, but the magnitude of the impacts remains poorly understood. Different spatial patterns of pervious and impervious surfaces influence flow and sediment connectivity between hillslopes and stream networks. Following years of research on the peri-urbanizing Ribeira dos Covoes catchment in Portugal, this study uses laboratory rainfall simulation experime...