scholarly journals A data-driven method for the determination of water-flow velocity in watershed modelling

2018 ◽  
Author(s):  
Qiming Zhou ◽  
Fangli Zhang ◽  
Liang Cheng
Keyword(s):  
Spatial Distribution ◽  
Flow Velocity ◽  
Water Flow ◽  
Hydrological Modeling ◽  
Overland Flow ◽  
Data Driven ◽  
Terrain Analysis ◽  
Hydrological Models ◽  
Water Flow Velocity ◽  
Water Transportation

Physically-based distributed hydrological models have always played an important role in watershed hydrology. Existing hydrological modeling applications focused more on the estimation of water balance and less on the simulation of water transportation in a catchment. Different from the prediction of flow production, the dynamic simulation of flow concentration depends largely on the field distribution of water-flow velocity. However, it is still difficult to determine the water-flow velocity with terrain analysis techniques, which had always hampered the application of hydrological models in surface water transportation simulation. This study, therefore, proposes a data-driven method for creating a field map of overland flow velocity based on the Manning’s equation. Case study on a gauged watershed is undertaken to validate the spatial distribution of flow velocity. The preliminary results indicate that the proposed empirical method can reasonably determine the spatial distribution of water-flow velocity. Further efforts are still required to support the space-time change of flow velocity under the control of microtopography and instantaneous water depth.

scholarly journals A data-driven method for the determination of water-flow velocity in watershed modelling

2018 ◽  
Author(s):  
Qiming Zhou ◽  
Fangli Zhang ◽  
Liang Cheng
Keyword(s):  
Spatial Distribution ◽  
Flow Velocity ◽  
Water Flow ◽  
Hydrological Modeling ◽  
Overland Flow ◽  
Data Driven ◽  
Terrain Analysis ◽  
Hydrological Models ◽  
Water Flow Velocity ◽  
Water Transportation

Physically-based distributed hydrological models have always played an important role in watershed hydrology. Existing hydrological modeling applications focused more on the estimation of water balance and less on the simulation of water transportation in a catchment. Different from the prediction of flow production, the dynamic simulation of flow concentration depends largely on the field distribution of water-flow velocity. However, it is still difficult to determine the water-flow velocity with terrain analysis techniques, which had always hampered the application of hydrological models in surface water transportation simulation. This study, therefore, proposes a data-driven method for creating a field map of overland flow velocity based on the Manning’s equation. Case study on a gauged watershed is undertaken to validate the spatial distribution of flow velocity. The preliminary results indicate that the proposed empirical method can reasonably determine the spatial distribution of water-flow velocity. Further efforts are still required to support the space-time change of flow velocity under the control of microtopography and instantaneous water depth.

The effects of changing water flow velocity on the formation of biofilms and water quality in pilot distribution system consisting of copper or polyethylene pipes

2006 ◽  
Vol 40 (11) ◽  
pp. 2151-2160 ◽  
Author(s):  
Markku J. Lehtola ◽  
Michaela Laxander ◽  
Ilkka T. Miettinen ◽  
Arja Hirvonen ◽  
Terttu Vartiainen ◽  
...  
Keyword(s):  
Water Quality ◽  
Flow Velocity ◽  
Water Flow ◽  
Distribution System ◽  
Water Flow Velocity ◽  
Polyethylene Pipes

scholarly journals Computing water flow through complex landscapes – Part 2: Finding hierarchies in depressions and morphological segmentations

2020 ◽  
Vol 8 (2) ◽  
pp. 431-445
Author(s):  
Richard Barnes ◽  
Kerry L. Callaghan ◽  
Andrew D. Wickert
Keyword(s):  
Water Flow ◽  
Hydrological Modeling ◽  
Dynamic Models ◽  
Terrain Analysis ◽  
Flow Paths ◽  
Topographic Complexity ◽  
Morphological Segmentation ◽  
Surface Water Flow ◽  
Digital Elevation ◽  
Flow Through

Abstract. Depressions – inwardly draining regions of digital elevation models – present difficulties for terrain analysis and hydrological modeling. Analogous “depressions” also arise in image processing and morphological segmentation, where they may represent noise, features of interest, or both. Here we provide a new data structure – the depression hierarchy – that captures the full topologic and topographic complexity of depressions in a region. We treat depressions as networks in a way that is analogous to surface-water flow paths, in which individual sub-depressions merge together to form meta-depressions in a process that continues until they begin to drain externally. This hierarchy can be used to selectively fill or breach depressions or to accelerate dynamic models of hydrological flow. Complete, well-commented, open-source code and correctness tests are available on GitHub and Zenodo.

Effect of slope gradient on the subsurface water flow velocity of sand layer profile

2020 ◽  
Vol 17 (3) ◽  
pp. 641-652 ◽  
Author(s):  
Zhen Han ◽  
Xiao-yan Chen ◽  
Yu-han Huang ◽  
Bang-lin Luo ◽  
Hang Xing ◽  
...  
Keyword(s):  
Flow Velocity ◽  
Water Flow ◽  
Subsurface Water ◽  
Sand Layer ◽  
Slope Gradient ◽  
Water Flow Velocity

scholarly journals Water load pattern in a production hall

2018 ◽  
Vol 45 ◽  
pp. 00015 ◽  
Author(s):  
Edyta Dudkiewicz ◽  
Alina Żabnieńska-Góra
Keyword(s):  
Flow Velocity ◽  
Water Flow ◽  
Hot Water ◽  
Domestic Water ◽  
Water Flow Velocity ◽  
Water Load ◽  
Actual Volume ◽  
Load Pattern ◽  
And Gender ◽  
Selection Of

The actual volume of water consumption in the various industrial halls is very diverse. Many factors have an impact on that value, depending on the demand for: domestic, fire-fighting, technologically specific target and other purposes. The demand for domestic water in the production hall is primarily due to the use of showers, wash basins and flush toilets. Workplaces should be appropriately equipped with hygienic and sanitary facilities, depending on its degree of soiling, type of work and gender. The water flow is relevant for dimensioning the water supply system including the diameter selection of the water pipes. Criterion for selection of the diameter is the flow velocity of the water which varies depending on the manufacturer’s guidelines, the material used and the law. The article analyses the dynamics of load pattern of hot water in industrial halls. The methods of flow calculation in production halls based on an analysis of patterns available in literature and the water flow velocity criteria is discussed. The results of the research of the dynamics of water load pattern in a production hall located in Wroclaw is presented and discussed.

scholarly journals Application of a Volterra quadratic polynomial to modeling elements of heat engineering devices

2019 ◽  
Vol 114 ◽  
pp. 01007 ◽  
Author(s):  
Ekaterina Antipina ◽  
Vadim Spiryaev ◽  
Emir Tairov
Keyword(s):  
Power Series ◽  
Flow Velocity ◽  
Power Unit ◽  
Water Flow ◽  
Cooling Water ◽  
Steam Flow ◽  
Dynamic Processes ◽  
Water Flow Velocity ◽  
Temperature Changes ◽  
Extreme Problem

This paper considers integral models built to describe dynamic processes in a 135 MW power unit condenser. For this purpose, we use a quadratic segment of the Volterra integral power series. The first set of models was built with a perturbation of the cooling water flow, and the second one with a perturbation of the steam flow. For all sets of models, changes in pressure and temperature in the condenser, as well as temperature changes in LHP-1, were considered as a response to perturbation. For models built with perturbation of the cooling water flow velocity, we considered an extreme problem of finding optimal amplitudes of the input perturbations. The results of calculations proved to be sufficiently accurate.

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