scholarly journals Modelling of sediment delivery amounts by a physically based erosion-3D model and empirical model USPED in the Svacenicky creek catchment

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
David Honek ◽  
Silvia Kohnová ◽  
Zuzana Németová
Keyword(s):  
Empirical Model ◽  
3D Model ◽  
Sediment Delivery ◽  
Physically Based

THE APPLICATION AND VALIDATION OF PHYSICALLY-BASED EROSION AND EMPIRICAL MODEL IN CENTRAL POLAND

2020 ◽  
Author(s):  
Zuzana Németová ◽  
Adam Krajewski ◽  
Kazimierz Banasik ◽  
Silvia Kohnová
Keyword(s):  
Sediment Yield ◽  
3D Model ◽  
Empirical Method ◽  
Engineering Practice ◽  
Delivery Ratio ◽  
Empirical Methods ◽  
Sediment Delivery ◽  
Central Poland ◽  
Study Results ◽  
Physically Based

The general problem of an appropriate erosion modelling can be seen in a lack of available data and in the validation and verification of the methodologies applied. The article includes two significant and challenging topics, i.e. the evaluation of the sediment amounts in a catchment and the validation of the methodologies used. The importance of the sediment estimation can be found not only in the modelling and prediction fields but also in the terms of engineering practice. The significance of erosion model validation lies in the confidence in the model itself and in the detection of its applicability and relevance. In this study, results obtained from the physically-based EROSION-3D model was compared with the sediment yield of a small agricultural catchment in central Poland. The estimation of sediment yield from the agricultural catchment has been conducted using the empirical method (USLE) coupled with a sediment delivery ratio (USLE-SDR) and verified by reservoir measurement. Firstly, the application of a physically-based EROSION-3D model has been done based on a continuous rainfall series for the selected period and afterwards the results have been compared with the sediment yield obtained by the empirical methods in order to test a model´s performance. The results of the paper point to the comparison of the results obtained by two different approaches, i.e. the physically-based and empirical methods together with the validation of the methods through the acoustic depth measurements.

The Simulation of Rusty Phenomenon Based on Image Texture Feature

2014 ◽  
Vol 513-517 ◽  
pp. 3972-3975
Author(s):  
Yin Xia Zhang ◽  
Guo Hua Geng ◽  
Ming Quan Zhou
Keyword(s):  
3D Model ◽  
Texture Feature ◽  
Texture Mapping ◽  
Image Texture ◽  
Realistic Modeling ◽  
Different Types ◽  
Physically Based

The simulation of aging appearance is essential in the realistic modeling, We propose a method using existing aging image to simulate aging appearance, We establish the classification library, extract the texture feature of different types aging and save them, set the weight of the texture feature and synthesis texture according to the environment. In addition, user can specify the constrained texture mapping position optionally. This method can simulate various rusty phenomenon simultaneously. It can also be combined with physically-based method and ton spreading-based method to implement rendering of realistic 3D model rapidly.

Sensitivity analysis of soil parameters and their impact on runoff-erosion processes

2020 ◽  
Vol 15 (1) ◽  
pp. 53-64
Author(s):  
David Honek ◽  
Zuzana Németová ◽  
Silvia Kohnová ◽  
Monika Šulc Michalková
Keyword(s):  
Sensitivity Analysis ◽  
3D Model ◽  
Soil Parameters ◽  
Erosion Processes ◽  
Initial Soil ◽  
Physically Based ◽  
Correct Determination ◽  
Variable Influence ◽  
Crucial Part

Abstract The modeling of soil erosion processes is affected by several factors that reflect the physical-geographic conditions of the study site together with the land use linkage. The soil parameters are significant in the modeling of erosion and also runoff processes. The correct determination of a soil's parameters becomes a crucial part of the model's calibration. This paper deals with a sensitivity analysis of seven soil input parameters to the physically-based Erosion 3D model. The results show the variable influence of each soil parameter. The Erosion 3D model is very sensitive to initial soil moisture, bulk density, and erodibility.

Identification of the affected areas by mass movement through a physically based model of landslide hazard combined with an empirical model of debris flow

2008 ◽  
Vol 45 (2) ◽  
Author(s):  
Roberto A. T. Gomes ◽  
Renato F. Guimarães ◽  
Osmar A. Carvalho ◽  
Nelson F. Fernandes ◽  
Eurípedes A. Vargas ◽  
...  
Keyword(s):  
Debris Flow ◽  
Empirical Model ◽  
Mass Movement ◽  
Landslide Hazard ◽  
Physically Based Model ◽  
Physically Based

Methods of Projecting 2D Wrinkle Curves onto a 3D Model

2014 ◽  
Vol 644-650 ◽  
pp. 1796-1800
Author(s):  
Xiao Dan Lin ◽  
Bing He ◽  
Xiu Lin Zhang
Keyword(s):  
3D Model ◽  
Brute Force ◽  
3D Mesh ◽  
Force Method ◽  
Quad Tree ◽  
Physically Based ◽  
Brute Force Method ◽  
Acceleration Method ◽  
Computationally Expensive ◽  
Simulation Results

Wrinkles make cloth simulation results more realistic. However, generating wrinkles with physically based methods usually requires a computationally expensive simulation, while geometric methods such as deforming the 3D mesh based on predefined curves need time-consuming manual design. In this paper, we extract 2D wrinkle curves from pictures of clothing and project the curves onto a 3D clothing model. Two schemes for projecting 2D curves to the 3D model are presented in the paper, including the brute force method and the acceleration method. The brute force method has excellent projection results and the acceleration method enhances the efficiency of projection process significantly. A quad tree for the 3D model is built up in the acceleration method to improve the efficiency of projection process.

scholarly journals Attenuation of concentration fluctuations of water vapor and other trace gases in turbulent tube flow

2008 ◽  
Vol 8 (3) ◽  
pp. 9819-9853 ◽  
Author(s):  
W. J. Massman ◽  
A. Ibrom
Keyword(s):  
Water Vapor ◽  
Empirical Model ◽  
Vapor Concentration ◽  
Tube Flow ◽  
Passive Tracer ◽  
Ambient Relative Humidity ◽  
Radial Profiles ◽  
Physically Based ◽  
Semi Empirical ◽  
Turbulent Tube Flow

Abstract. Recent studies with closed-path eddy covariance (EC) systems have indicated that the attenuation of fluctuations of water vapor concentration is dependent upon ambient relative humidity, presumably due to sorption/desorption of water molecules at the interior surface of the tube. Previous studies of EC-related tube attenuation effects have either not considered this issue at all or have only examined it superficially. Nonetheless, the attenuation of water vapor fluctuations is clearly much greater than might be expected from a passive tracer in turbulent tube flow. This study reexamines the turbulent tube flow issue for both passive and sorbing tracers with the intent of developing a physically-based semi-empirical model that describes the attenuation associated with water vapor fluctuations. Toward this end, we develop a new model of tube flow dynamics (radial profiles of the turbulent diffusivity and tube airstream velocity). We compare our new passive-tracer formulation with previous formulations in a systematic and unified way in order to assess how sensitive the passive-tracer results depend on fundamental modeling assumptions. We extend the passive tracer model to the vapor sorption/desorption case by formulating the model's wall boundary condition in terms of a physically-based semi-empirical model of the sorption/desorption vapor fluxes. Finally we synthesize all modeling and observational results into a single analytical expression that captures the effects of the mean ambient humidity and tube flow (Reynolds number) on tube attenuation.

scholarly journals Validation of the EROSION-3D Model through Measured Bathymetric Sediments

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1082
Author(s):  
Zuzana Németová ◽  
David Honek ◽  
Silvia Kohnová ◽  
Kamila Hlavčová ◽  
Monika Šulc Michalková ◽  
...  
Keyword(s):  
3D Model ◽  
Slovak Republic ◽  
Model Performance ◽  
Scientific Work ◽  
Erosion And Deposition ◽  
Small Reservoir ◽  
Rainfall Events ◽  
Erosion Processes ◽  
Physically Based ◽  
Model Point

The testing of a model performance is important and is also a challenging part of scientific work. In this paper, the results of the physically-based EROSION-3D (Jürgen Schmidt, Berlin, Germany) model were compared with trapped sediments in a small reservoir. The model was applied to simulate runoff-erosion processes in the Svacenický Creek catchment in the western part of the Slovak Republic. The model is sufficient to identify the areas vulnerable to erosion and deposition within the catchment. The volume of sediments was measured by a bathymetric field survey during three terrain journeys (in 2015, 2016, and 2017). The results of the model point to an underestimation of the actual processes by 30% to 80%. The initial soil moisture played an important role, and the results also revealed that rainfall events are able to erode and contribute to a significant part of sediments.

scholarly journals Attenuation of concentration fluctuations of water vapor and other trace gases in turbulent tube flow

2008 ◽  
Vol 8 (20) ◽  
pp. 6245-6259 ◽  
Author(s):  
W. J. Massman ◽  
A. Ibrom
Keyword(s):  
Water Vapor ◽  
Empirical Model ◽  
Vapor Concentration ◽  
Tube Flow ◽  
Passive Tracer ◽  
Ambient Relative Humidity ◽  
Radial Profiles ◽  
Physically Based ◽  
Semi Empirical ◽  
Turbulent Tube Flow

Abstract. Recent studies with closed-path eddy covariance (EC) systems have indicated that the attenuation of fluctuations of water vapor concentration is dependent upon ambient relative humidity, presumably due to sorption/desorption of water molecules at the interior surface of the tube. Previous studies of EC-related tube attenuation effects have either not considered this issue at all or have only examined it superficially. Nonetheless, the attenuation of water vapor fluctuations is clearly much greater than might be expected from a passive tracer in turbulent tube flow. This study reexamines the turbulent tube flow issue for both passive and sorbing tracers with the intent of developing a physically-based semi-empirical model that describes the attenuation associated with water vapor fluctuations. Toward this end, we develop a new model of tube flow dynamics (radial profiles of the turbulent diffusivity and tube airstream velocity). We compare our new passive-tracer formulation with previous formulations in a systematic and unified way in order to assess how sensitive the passive-tracer results depend on fundamental modeling assumptions. We extend the passive tracer model to the vapor sorption/desorption case by formulating the model's wall boundary condition in terms of a physically-based semi-empirical model of the sorption/desorption vapor fluxes. Finally we synthesize all modeling and observational results into a single analytical expression that captures the effects of the mean ambient humidity and tube flow (Reynolds number) on tube attenuation.

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