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Wyszukujesz frazę "inundation area" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Improved methods of classification of multispectral aerial photographs: evaluation of floodplain forests in the inundation area of the Danube
Autorzy:
Bucha, T.
Slavik, M.
Powiązania:
https://bibliotekanauki.pl/articles/38725.pdf
Data publikacji:
2013
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
classification
aerial photograph
flood plain forest
defoliation
inundation area
Danube flood plain
Opis:
The Gabčíkovo hydroelectric power plant has significantly influenced Danube water regime, thus the condition of floodplain forests in the region. Forest condition has been regularly monitored since 1995 using aerial photos. The subject of this study was to improve the procedure of floodplain forest health evaluation based on digital multispectral aerial images. Firstly, the forest mask was created with overall accuracy 89%, and next, tree health was evaluated using defoliation as health indicator. We applied orthogonal transformation of 4 original bands of multispectral imagery into two-dimensional space. Marginal values of digital numbers (DN) of the first component (New Synthetic Channel – NSC1) were defined by fully foliated willow and poplar. The second component (NSC2) was optimised for damage estimation. Calculated DN values of NSC2 represented a perpendicular distance from the line of DN values of the first component. The distance from the line was proportionate to tree damage extent in a given pixel. We generated linear regression model between pair values of NSC2 and defoliation evaluated for 38 trees in the field, respectively, from aerial photos. A decline prediction resulted in r-square equal 0.86. Finally, we used the model to predict defoliation for each picture element (pixel) of the component NSC2.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 2
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of flooding of real-topography developed areas following river embankment failure
Autorzy:
Szydłowski, M.
Twaróg, B.
Powiązania:
https://bibliotekanauki.pl/articles/1955326.pdf
Data publikacji:
2006
Wydawca:
Politechnika Gdańska
Tematy:
numerical simulation
river embankment failure
inundation
developed area
Opis:
The paper concerns numerical simulations of flood wave propagation in an urban area resulting from a river embankment failure. Simulations have been performed to predict and analyze the parameters of flash and catastrophic flow in a developed area with the aim of presenting numerical calculations useful for identification of inundation zones. The shallow water equations were assumed as the mathematical model of free-surface unsteady water flow. A numerical scheme of the finite volume method was applied to solve the model equations and the Roe method used to approximate the mass and momentum fluxes. Two test cases of embankment failure are investigated in the paper. The aim of one experiment is to simulate a flood in a model city area, where a group of buildings representing a simplified urban configuration was introduced. In order to verify the calculations, numerical results were examined against experimental data available from laboratory measurements. An experiment of the model city's flooding event was carried out at the hydraulic laboratory of the Gdansk University of Technology. The other test case concerns flash flood simulation on an embanked developed area of real topography.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 3; 321-338
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inundation controlling practice in urban area: Case study in residential area of Malang, Indonesia
Autorzy:
Harisuseno, Donny
Bisri, Mohammad
Haji, Tunggul S.
Powiązania:
https://bibliotekanauki.pl/articles/946892.pdf
Data publikacji:
2020
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
channel normalization
inundation
runoff
SIMODAS model
storage well
urban area
Opis:
Flood inundation processes in urban areas are primarily affected by artificial factors such as drainage facilities, local alterations of topography and land uses. The objective of this study is to examine the capability of hydrological model SI-MODAS to estimate runoff and investigating the utilization of storage well in controlling runoff in a residential area. The result of the estimated runoff from the hydrological model was compared with the existing capacity of the drainage channel to identify which channel experienced the problem of inundation. The location of inundation was used to determine the location and number of storage well. The results showed that SIMODAS model could be applied in runoff analyses with 8.09% of relative error compared with runoff depth from field measurement. The existing capacity of the channel could not accommodate runoff Q10yr where the inundation discharge was approximately 0.24 m3·s–1 (at outlet point 1) and 0.12 m3·s–1 (at outlet point 2). The inundation problem was overcome by using a combination system between channel normalization (reduce 35% of total inundation discharge) and storage well system (reduce 65% of total inundation discharge). The storage well was designed at 20 locations (at outlet point 1) and 16 locations (at outlet point 2) which each well had a discharge of 0.0058 m3·s–1. The storage well combined with channel normalization could be used as an alternative way to solve inundation problems in a residential area considering the constraint of land space limitation in the urban area.
Źródło:
Journal of Water and Land Development; 2020, 46; 112-120
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Representation of a Built-up Area in the Numerical Simulation of Urban Flash Flooding
Autorzy:
Szydłowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/241216.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
numerical simulation
flash flooding
urban inundation
built-up area representation
building wall boundary condition
Opis:
The paper concerns numerical simulation of rapidly varied water flow resulting from flash flood propagation in a built-up floodplain. As the mathematical model of free surface unsteady water flow, the shallow water equations are assumed. In order to solve the equations, a numerical scheme of finite volume method is applied. For approximation of mass and momentum fluxes, the Roe method is used. Two methods of built-up area representation in a numerical model are presented in the paper - exclusion of the buildings from the numerical mesh of flow area and substitution of the buildings with high friction zones. In order to assess the quality of the numerical results obtained using both methods, the flow in the model city area with the building group representing a simplified town configuration was simulated. The numerical results were examined against the experimental data available due to laboratory depth measurements. The experiment of model city flooding was carried out in the hydraulic laboratory of Gdańsk University of Technology. Finally, the influence of the type of the boundary conditions imposed on building walls on simulation results is studied.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 4; 285-298
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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