GENERATION OF MONTHLY AVERAGE FLOW RATES FROM THE HYDROLOGICAL CHARACTERISTICS IN THE HUANCANE RIVER BASIN

2019 ◽  
Author(s):  
KEVIN A TRAVERSO ◽  
JOSÉ A MAMANI ◽  
ROBERTO ALFARO
Keyword(s):  
River Basin ◽  
Flow Rates ◽  
Average Flow ◽  
Hydrological Characteristics ◽  
Monthly Average

Influence of hydrodynamics of electrolyte flow during electrochemical treatment on the quality of the treated surface

2021 ◽  
pp. 55-60
Author(s):  
Keyword(s):  
Electrical Conductivity ◽  
Current Density ◽  
Electrochemical Treatment ◽  
Flow Lines ◽  
Electrolyte Flow ◽  
Flow Rates ◽  
Average Flow ◽  
Electrochemical Processing ◽  
Interelectrode Gap

The features of the hydrodynamics of the electrolyte in the interelectrode gap during electrochemical processing of a profile axisymmetric workpiece are considered. The distribution of average flow rates and flow lines is calculated for a specified electrolyte supply. The nature and rate of the electrolyte flow are established. The unevenness of the current density is determined taking into account the change in the electrical conductivity of the electrolyte from heating and gas filling of the interelectrode gap, as well as the quality of the treated surface. Keywords: electrochemical treatment, roughness, electrolyte, electrical conductivity, gas filling. [email protected]

Scale Dependency of Hydrological Characteristics in the Upper Ping River Basin, Northern Thailand

2007 ◽  
pp. 67-74 ◽  
Author(s):  
Koichiro Kuraji ◽  
Kowit Punyatrong ◽  
Issara Sirisaiyard ◽  
Chatchai Tantasirin ◽  
Nobuaki Tanaka
Keyword(s):  
River Basin ◽  
Scale Dependency ◽  
Northern Thailand ◽  
Hydrological Characteristics

scholarly journals Assessment of Anthropogenic Factors Impact On Annual and Seasonal Runoff in the Belaya River Basin

2014 ◽  
pp. 119-126
Author(s):  
Keyword(s):  
Statistical Methods ◽  
River Basin ◽  
Annual Runoff ◽  
Anthropogenic Factors ◽  
Economic Activities ◽  
Hydrological Characteristics ◽  
Seasonal Runoff ◽  
Anthropogenic Alterations

Research of the runoff hydrological characteristics anthropogenic alterations in the Belaya River basin has been conducted with statistical methods. Assessment of the economic activities impact on the annual runoff value and assessment of the ponds’role in the within-year runoff redistribution has been carried out.

JUSTIFICATION OF THE EFFECTIVENESS OF THE PROLETARIAN MAIN CANAL DURING RECONSTRUCTION

2021 ◽  
pp. 77-84
Author(s):  
YU.М. KOSICHENKO ◽  
◽  
O. A. BAEV
Keyword(s):  
Protective Coatings ◽  
Effective Cross Section ◽  
Protective Layer ◽  
Hydraulic Calculation ◽  
Design Data ◽  
Cross Sectional ◽  
Flow Rates ◽  
Average Flow ◽  
Average Flow Velocity ◽  
Main Canal

Calculations of the main parameters of the Proletarsky main canal for a polygonal section during its reconstruction for various options are presented. A method for hydraulic calculation of the Proletarsky main canal has been carried out. The developed method of the hydraulic calculation is based on the determination of the coefficient of reduction of the polygonal shape of the section to the trapezoidal one according to the formula of A.A. Uginchus. Then the cross-sectional area of each element is found after reduction to a trapezoidal section, the wetted perimeters, hydraulic radius and Shezi coefficient of each section element are calculated. For the earthen channel of the canal, the obtained hydraulic characteristics closely matched the design data for the fl ow rate and average current velocity. The earthen channel of the canal with an ice cover has a significant decrease in hydraulic parameters from the design section, both in terms of flow rate up to 36.0 m3/s (or by 33%) and in terms of the average flow velocity up to 0.410 m/s. The widened asymmetrical earthen channel is characterized by an increased discharge up to 57.47 m3/s, an effective cross-section of 101 m2 and a wetted perimeter of 42.0 m in comparison with the design section. For the channel of the canal section with a protective strengthening made of a rock fill and gravel-pebble coating, reduced characteristics were obtained both in terms of flow rates and average flow rates which is due to their high value of roughness coefficients. At the same time, it was found that a decrease in the roughness coefficients of protective coatings during operation due to the colmatage of alluviums particles will lead to an increase in water consumption in the canal. However, the process of alluviums colmatage of the protective layer of stone material will be slow, for 10 years or more.

scholarly journals Characteristics and Adaptability Assessment of Commonly Used Ecological Flow Methods in Water Storage and Hydropower Projects, the Case of Chinese River Basins

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2035
Author(s):  
Lejun Ma ◽  
Huan Wang ◽  
Changjun Qi ◽  
Xinnan Zhang ◽  
Hanwen Zhang
Keyword(s):  
River Basin ◽  
Yellow River ◽  
Yangtze River Basin ◽  
Water Storage ◽  
Yellow River Basin ◽  
River Basins ◽  
Average Flow ◽  
Ecological Flow ◽  
Tennant Method ◽  
Rate Method

The construction and operation of water storage and hydropower projects affects the structure of water ecosystems of downstream rivers, and the establishment of ecological flow in rivers below the water storage and hydropower projects has significant impacts on maintaining the stability of river ecosystems. A database was established based on 2000–2017 environmental impact assessment (EIA) reports on water storage and hydropower projects in China and ecological flow (e-flow) methods, and the three widely used e-flow methods for water storage and hydropower projects in China were identified on the database. Furthermore, an ecological flow satisfaction degree model was used to evaluate the methods using long series of historical hydrological data from the hydrological stations in the Yellow River basin, the Yangtze River basin, and the Liao River basin. The results showed that hydrological methods are the type most often used for water storage and hydropower projects in China, including the Tennant method, the minimum monthly average flow with 90% guarantee rate method (Mm9M method), and the measured historical minimum daily average flow rate method (MDM method). However, the ecological flow methods selected are not significantly different among different basins, indicating that the selection of ecological flow methods is rather arbitrary, and adaptability analysis is not available. The results of the ecological flow satisfaction model showed that the Tennant method is not suitable for large river basins. The results of this study can provide technical support for establishment and management decisions surrounding ecological flow.

scholarly journals Simulating Water and Pollution Exports from Soil to Stream during the Thawing Period at the Small River Basin Scale

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1506
Author(s):  
Pengxiang Wang ◽  
Kang Wang ◽  
Zuhao Zhou
Keyword(s):  
River Basin ◽  
Transport Processes ◽  
Small River ◽  
Model Parameters ◽  
Pollution Transport ◽  
Flow Rates ◽  
Transport And Transformation ◽  
Basin Scale ◽  
Small River Basin ◽  
Pollution Concentrations

A physical model was developed to describe the soil-to-stream export processes of water and pollutants in a small river basin during the soil thawing period. The hydrological and pollution transport and transformation behaviors in paddy- and corn-dominated catchments were numerically simulated; the impacts of the pollution concentrations, interactions between the migrated water and pollutants in the soil, and pollutant transformations during the pollution export were coupled. Experimental field data from the Heidingzi river basin during the soil thawing period were used to calibrate the model parameters and evaluate the performance. The mass of the dissolved pollutants from soil particles in the migrated soil pore water was the key factor affecting the pollution export into the streams; the water content directly affected the pollution export. The concentration of the pollutants peaked when the initial exported water was high. The pollutant transport processes influenced the pollution export more significantly after the soil water was significantly reduced. The N-S efficiency coefficients between the simulated and monitored flow rates and the pollution concentrations at the outlets of the paddy- and corn-dominated catchments were >0.60 and >0.54, respectively. The system deviations between the simulated and monitored flow rates and the pollution concentrations were <10% and <15%, respectively. The proposed model effectively described the water flow, pollution transport and transformation processes.

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