Parameter recalculation for a rainfall-runoff model with a focus on runoff curve numbers

Řehánek, Tomáš; Podhoranyi, Michal; Křenek, Jan

doi:10.2478/geosc-2019-0013

Cited by 3 publications

(1 citation statement)

References 9 publications

(6 reference statements)

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“…CN values can range from 0 to 100, in which high values are associated with less permeable soils and thus higher surface runoff. In practice, CN values estimated for Madeira assume that surface runoff and infiltration are dependent on the soil type and land use (e.g., Řehánek et al, 2019;Lopes et al, 2020). According to USDA Soil Conservation Service (1972), soils can be divided into four hydrologic groups from A to D, in which type A/D soil has the highest/lowest hydraulic conductivity and lowest/highest surface runoff potential.…”

Section: Mohid-land the Hydrological Modelmentioning

confidence: 99%

Impact of Flash Flood Events on the Coastal Waters Around Madeira Island: The “Land Mass Effect”

et al. 2022

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The Island Mass Effect has been primarily attributed to nutrient enhancement of waters surrounding oceanic islands due to physical processes, whereas the role of land runoff has seldom been considered. Land runoff can be particularly relevant in mountainous islands, highly susceptible to torrential rainfall that rapidly leads to flash floods. Madeira Island, located in the Northeast Atlantic Ocean, is historically known for its flash flood events, when steep streams transport high volumes of water and terrigenous material downstream. A 22-year analysis of satellite data revealed that a recent catastrophic flash flood (20 February 2010) was responsible for the most significant concentration of non-algal Suspended Particulate Matter (SPM) and Chlorophyll-a at the coast. In this context, our study aims to understand the impact of the February 2010 flash flood events on coastal waters, by assessing the impact of spatial and temporal variability of wind, precipitation, and river discharges. Two specific flash floods events are investigated in detail (2 and 20 February 2010), which coincided with northeasterly and southwesterly winds, respectively. Given the lack of in situ data documenting these events, a coupled air-sea-land numerical framework was used, including hydrological modeling. The dynamics of the modeled river plumes induced by flash floods were strongly influenced by the wind regimes subsequently affecting coastal circulation, which may help to explain the differences between observed SPM and Chlorophyll-a distributions. Model simulations showed that during northeasterly winds, coastal confinement of the buoyant river plume persisted on the island’s north coast, preventing offshore transport of SPM. This mechanism may have contributed to favorable conditions for phytoplankton growth, as captured by satellite-derived Chlorophyll-a in the northeastern coastal waters. On the island’s south coast, strong ocean currents generated in the eastern island flank promoted strong vertical shear, contributing to vertical mixing. During southwesterly winds, coastal confinement of the plume with strong vertical density gradient was observed on the south side. The switch to eastward winds spread the south river plume offshore, forming a filament of high Chlorophyll-a extending 70 km offshore. Our framework demonstrates a novel methodology to investigate ocean productivity around remote islands with sparse or absent field observations.

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Section: Mohid-land the Hydrological Modelmentioning

confidence: 99%

Impact of Flash Flood Events on the Coastal Waters Around Madeira Island: The “Land Mass Effect”

et al. 2022

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A complete methodology to assess hydraulic risk in small ungauged catchments based on HEC-RAS 2D Rain-On-Grid simulations

Ennouini,

Fenocchi,

Petaccia

et al. 2024

Nat Hazards

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This paper explores the use of the rain-on-grid (or direct rainfall) method for flood risk assessment at a basin scale. The method is particularly useful for rural catchments with small vertical variations and complex interactions with man-made obstacles and structures, which may be oversimplified by traditional hydrologically based estimations. The use of a hydrodynamic model solving mass and momentum conservation equations allows the simulation of runoff over the watershed at a basin scale. As a drawback, more detailed and spatially distributed data are needed, and the computational time is extended. On the other hand, a smaller number of parameters is needed compared to a hydrological model. Roughness and rainfall loss coefficients need to be calibrated only. The direct rainfall methodology was here implemented within the two-dimensional HEC-RAS model for the low-land rural, and ungauged, watershed of the Terdoppio River, Northern Italy. The resulting hydrographs at the closing section of the watershed were compared to synthetic design hydrographs evaluated through pure hydrological modelling, showing agreement on the peak discharge values for the low-probability scenarios, but not on the total volumes. The results in terms of water depth and flow velocity maps were used to create flood hazard maps using the Australian Institute for Disaster Resilience methodology. The Index of Proportional Risk model was then adopted to generate a basin-scale flood risk map, by combining flood hazard maps, damage functions for different building-use classes, and the value of reconstruction and content per unit area.

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Applied GIS in the context of smart regions and cities

Horák

Ivan

2019

GeoScape

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Parameter recalculation for a rainfall-runoff model with a focus on runoff curve numbers

Cited by 3 publications

References 9 publications

Impact of Flash Flood Events on the Coastal Waters Around Madeira Island: The “Land Mass Effect”

Impact of Flash Flood Events on the Coastal Waters Around Madeira Island: The “Land Mass Effect”

A complete methodology to assess hydraulic risk in small ungauged catchments based on HEC-RAS 2D Rain-On-Grid simulations

Applied GIS in the context of smart regions and cities

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