scholarly journals Runoff Prediction Based on the Discharge of Pump Stations in an Urban Stream Using a Modified Multi-Layer Perceptron Combined with Meta-Heuristic Optimization

Water ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 99
Author(s):  
Won Jin Lee ◽  
Eui Hoon Lee
Keyword(s):  
Harmony Search ◽  
Urban Streams ◽  
Stochastic Gradient Descent ◽  
Urban Stream ◽  
Multi Layer Perceptron ◽  
Pump Station ◽  
Real Coded Genetic Algorithm ◽  
Runoff Prediction ◽  
Pump Stations ◽  
Peak Value

Runoff in urban streams is the most important factor influencing urban inundation. It also affects inundation in other areas as various urban streams and rivers are connected. Current runoff predictions obtained using a multi-layer perceptron (MLP) exhibit limited accuracy. In this study, the runoff of urban streams was predicted by applying an MLP using a harmony search (MLPHS) to overcome the shortcomings of MLPs using existing optimizers and compared with the observed runoff and the runoff predicted by an MLP using a real-coded genetic algorithm (RCGA). Furthermore, the results of the MLPHS were compared with the results of the MLP with existing optimizers such as the stochastic gradient descent, adaptive gradient, and root mean squared propagation. The runoff of urban steams was predicted based on the discharge of each pump station and rainfall information. The results obtained with the MLPHS exhibited the smallest error of 39.804 m3/s when compared to the peak value of the observed runoff. The MLPHS gave more accurate runoff prediction results than the MLP using the RCGA and that using existing optimizers. The accurate prediction of the runoff in an urban stream using an MLPHS based on the discharge of each pump station is possible.

scholarly journals Method for Operating Drainage Pump Stations Considering Downstream Water Level and Reduction in Urban River Flooding

Water ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 2741
Author(s):  
Yeon-Moon Choo ◽  
Jong-Gu Kim ◽  
Shang-Ho Park ◽  
Tai-Ho Choo ◽  
Yeon-Woong Choe
Keyword(s):  
Climate Change ◽  
Water Level ◽  
Rainfall Data ◽  
Urban Stream ◽  
River Flooding ◽  
River Level ◽  
Structural Problems ◽  
Pump Station ◽  
The Government ◽  
Pump Stations

Korea experiences increasing annual torrential rains owing to climate change and river flooding. The government is expanding a new drainage pump station to minimize flood damage, but the river level has not been adjusted because of torrential rains. Therefore, the river level must be adjusted to operate the drainage pump station, and it can be adjusted through the reservoir of the drainage pump station. In this study, we developed a method for operating drainage pump stations to control the river level and verify the effectiveness of the proposed method. A stormwater management model (SWMM) was used to simulate the Suyeong River and Oncheon River in Busan, Korea. The rainfall data from 2011 to 2021 were investigated. The data were sorted into ten big floods that occurred in Busan. The model was calibrated with actual rainfall data. The water level of the Suyeong River and the Oncheon River was the highest in most simulations. The simulation results showed an average decrease of 3018.2 m3 in Suyeong River flooding, and the Oncheon River needed to be supplemented due to structural problems. As a result of the recombination by simply supplementing the structural problems of the Oncheon River, the average flooding of 194.5 m3 was reduced. The proposed method is economical and efficient for reducing urban stream flooding in areas susceptible to severe damage caused by climate change.

Research on Optimization of the Design(Inverse) Issue of S2 Surface of Axial Compressor Based on Genetic Algorithm

2020 ◽  
Author(s):  
Zijing Chen ◽  
Bo Liu ◽  
Xiaoxiong Wu
Keyword(s):  
Genetic Algorithm ◽  
Total Pressure ◽  
Fitness Function ◽  
Pressure Ratio ◽  
Axial Compressor ◽  
Local Data ◽  
Real Coded Genetic Algorithm ◽  
Overall Efficiency ◽  
Total Pressure Ratio ◽  
Peak Value

Abstract In order to further improve the effectiveness of design(inverse) issue of S2 surface of axial compressor, a design method of optimization model based on real-coded genetic algorithm is instructed, with a detailed description of some important points such as the population setting, the fitness function design and the implementation of genetic operator. The method mainly takes the pressure ratio, the circulation as the optimization variables, the total pressure ratio and the overall efficiency of the compressor as the constraint condition and the decreasing of the diffusion factor of the compressor as the optimization target. In addition, for the propose of controlling the peak value of some local data after the optimization, a local optimization strategy is proposed to make the method achieve better results. In the optimization, the streamline curvature method is used to perform the iterative calculation of the aerodynamic parameters of the S2 flow surface, and the polynomial fitting method is used to optimize the dimensionality of the variables. The optimization result of a type of ten-stage axial compressor shows that the pressure ratio and circulation parameters have significant effect on the diffusion factor’s distribution, especially for the rotor pressure ratio. Through the optimization, the smoothness of the mass-average pressure ratio distribution curve of the rotors at all stages of the compressor is improved. The maximum diffusion factors in spanwise of rotor rows at the first, fifth and tenth stage of the compressor are reduced by 1.46%, 12.53% and 8.67%, respectively. Excluding the two calculation points at the root and tip of the blade because of the peak value, the average diffusion factors in spanwise are reduced by 1.28%, 3.46%, and 1.50%, respectively. For the two main constraints, the changes of the total pressure ratio and overall efficiency are less than 0.03% and 0.032%, respectively. In the end, a 3-d CFD numerical result is given to testify the effects of the optimization, which shows that the loss in the compressor is decreased by the optimization algorithm.

scholarly journals The Value and Services of Urban Stream Polygnotou, Thessaloniki

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 576
Author(s):  
Eleni A. Athanasiadou ◽  
Maria Tratsela ◽  
Eleni Gkrimpa
Keyword(s):  
Green Infrastructure ◽  
Large Scale ◽  
Economic Value ◽  
Urban Streams ◽  
Urban Stream ◽  
Riparian Ecosystems ◽  
Runoff Water ◽  
Ecological Processes ◽  
Urban Stream Syndrome ◽  
Mental Map

Grey, blue and green infrastructure supports socio-ecological processes the city undergoes. Yet, procedures of constructing anthropogenic habitats often undermine the value of natural landscape elements such as urban streams. Thessaloniki’s backbone comprises of urban streams that run from the suburban forest of ‘Seih-Sou’ to the Thermaikos Gulf acting as corridors of the natural urban matrix. Policies of the past have dealt with urban streams through extensive engineering drainage methods, eliminating the risk of flooding, yet resulting in rapid stormwater runoff, water quality problems, disturbed riparian ecosystems, leading to the urban stream syndrome. Furthermore, they have failed to address urban streams as an inseparable part of the landscape and thus to incorporate them in people’s mental map and everyday activities. The paper discusses the case of ‘Polygnotou stream’ which forms the beginning of the large scale engineered peripheral moat of Thessaloniki, constructed in the 60’s, and playing the role of the water recipient for six urban streams in total. It falls unknown to the majority of people living in the area, yet its services as an ecosystem ought to be acknowledged, helping inform decision makers of its socio-ecologic, perceptual and economic value. In addition, Polygnotou stream, adjacent streams and the peripheral moat overall, could be considered as a touristic product of great importance.

MODELING OF PUMP OPERATION CONDITIONS IN GRAVITY-PRESSURE COMBINED SYSTEMS

2017 ◽  
Vol 168 (48) ◽  
pp. 35-44
Author(s):  
Ireneusz Nowogoński ◽  
Ewa Ogiołda ◽  
Marlena Kubiszyn
Keyword(s):  
Working Conditions ◽  
Dynamical Analysis ◽  
Active Volume ◽  
Pump Operation ◽  
Operation Conditions ◽  
Pump Station ◽  
Pumping Stations ◽  
Pump Stations ◽  
Systems Simulation ◽  
Selection Of

The paper presents the problem of working conditions in gravitationalpressure systems simulation. The practical example takes into account the dynamical analysis of a system equipped with 10 pump stations with different functions. Both local press stations, local stations for shallowing network and transit pumping stations between the towns were used. The model allowed to optimize the active volume of the pump station tanks, the selection of pumps, including the frequency of power on and the time of holding the sewage.

DECREASE OF SILTING IN A FOREBAY OF AMELIORATION PUMP STATIONS

2013 ◽  
Vol 3 (4) ◽  
pp. 49-53 ◽  
Author(s):  
B. U URIShEV ◽  
M. M MUKhAMMADIEV ◽  
F. NOSIROV ◽  
S. R ZhURAEV
Keyword(s):  
Water Intake ◽  
Laboratory Research ◽  
Research Results ◽  
Pump Station ◽  
Pump Stations

The structure of a new water intake amelioration pump station that can prevent a forebays silting is described. The article reports on the designed structures laboratory research results.

ABOUT CALCULATING ESTIMATED COSTS AT DESIGNING PUMPING PLANTS FOR BLOCKS

2012 ◽  
Vol 2 (1) ◽  
pp. 59-62
Author(s):  
V. V ShMIGOL' ◽  
M. D ChERNOSVITOV
Keyword(s):  
Water Consumption ◽  
Pump Station ◽  
Pump Stations

Four variants of determining calculative costs for designing pump stations are compared. It is found that at designing one should use the operational norm of water consumption got on the bases of the existing operating block pump station.

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