scholarly journals Wind Erosion Changes in a Semi-Arid Sandy Area, Inner Mongolia, China

2019 ◽  
Vol 11 (1) ◽  
pp. 188 ◽  
Author(s):  
Hanbing Zhang ◽  
Yang Gao ◽  
Danfeng Sun ◽  
Lulu Liu ◽  
Yanzhi Cui ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Erosion ◽  
Driving Forces ◽  
Vegetation Coverage ◽  
Average Wind Speed ◽  
Sandy Area ◽  
Treatment Measures ◽  
Key Steps ◽  
Erosion Equation ◽  
Semi Arid

Wind erosion is one of the major environmental problems in drylands. Identifying the dominant natural factors of wind erosion and using targeted treatment measures are the key steps in wind erosion control. Using Horqin Left Back Banner in China as a case study, we applied the revised wind erosion equation to simulate the spatial distribution of wind erosion in the semi-arid sandy area. Contribution assessment and constraint line analysis were used to investigate the contributions of driving forces to wind erosion changes. The results showed that the wind erosion in the whole area was reduced by 0.35 t/hm2·a from 2005 to 2016. The wind factor and vegetation coverage factor had dominant contributions to the wind erosion modulus and accounted for the erosion in 49.87% and 50.13% of the total area, respectively. In addition, the average wind speed exceeding the threshold and the number of occurrences exhibited significant correlations with the wind erosion severity. Meanwhile, the mitigation effects of vegetation coverage on wind erosion decreased with the increase in wind speed. The temporal mismatch between the wind speed and vegetation coverage was the main reason for the frequent severe wind erosion in spring. Reducing the spring wind speed through adding windbreaks would be an effective method for decreasing wind erosion in semi-arid areas.

scholarly journals Caracterização da Velocidade e Direção do Vento em Mossoró/RN (Characterization of Wind Speed and Direction in Mossoró/RN)

2014 ◽  
Vol 7 (4) ◽  
pp. 746
Author(s):  
Giuliana Mairana de Morais ◽  
José Espínola Sobrinho ◽  
Wesley De Oliveira Santos ◽  
Danielly De Oliveira Costa ◽  
Saulo Tasso Araújo da Silva ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Direction ◽  
Agricultural Activities ◽  
Prevailing Wind ◽  
Average Wind Speed ◽  
Average Wind ◽  
Prevailing Wind Direction ◽  
Automatic Station ◽  
Semi Arid

O vento é de grande importância para muitas atividades humanas, especialmente para as atividades agropecuárias. O objetivo desse trabalho foi caracterizar a velocidade e a direção predominante do vento para Mossoró/RN, no período de janeiro de 2000 a dezembro de 2012. Foram analisados dados da velocidade média do vento a 10 m e 2 m de altura e direção predominante do vento para o período de 24 horas. Os dados foram coletados por uma Estação Meteorológica Automática, localizada na UFERSA (Universidade Federal Rural do Semi-Árido), em Mossoró/RN. Os valores da velocidade média do vento tendem a aumentar no segundo semestre do ano, tendo uma queda nos seus valores no primeiro semestre. Os valores médios de velocidade do vento para o período estudado foram de 3,32 m s-1 para 10 m e de 2,30 m s-1 para 2 m de altura, já as velocidades máximas instantânea do período estudado foram de 13,04 m s-1 para 10 m e de 9,40 m s-1 para 2 m de altura. A direção predominante do vento ficou na maioria dos meses entre sudeste (SE) e leste (E).   ABSTRACT The wind is of great importance to many human activities, especially for agricultural activities. The aim of this study was to characterize the speed and direction of the prevailing wind to Mossoró/RN, from January 2000 to December 2012. The datas from the average wind speed at 10 m and 2 m in height and the prevailing wind direction for the period of 24 hours. Data were collected by an Automatic Weather Station, located in UFERSA (Federal Rural University of the Semi - Arid), in Mossoró/RN. The values of average wind speed tend to increase in the second half of the year, with a fall in values in the first half. The average wind speed for the study period were 3.32 m s-1 to 10 m and 2.30 m s-1 to 2 m high, since the instantaneous speeds of the study period were 13.04 m s-1 to 10 m and 9.40 m s-1 to 2 m in height. The predominant wind direction was in most months between southeast (SE) and east (E).   Keywords: Climate, Anemometer, Automatic Station. 

SHAPING OF AN AUTONOMOUS POWER SYSTEM FOR GUARANTEED POWER SUPPLY WITH THE PREDOMINANCE WIND ENERGY

2018 ◽  
pp. 28-50
Author(s):  
S. G. Ignatiev ◽  
S. V. Kiseleva
Keyword(s):  
Energy Storage ◽  
Wind Speed ◽  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Energy Demand ◽  
Diesel Generator ◽  
Average Wind Speed ◽  
Wind Speeds ◽  
Average Wind

Optimization of the autonomous wind-diesel plants composition and of their power for guaranteed energy supply, despite the long history of research, the diversity of approaches and methods, is an urgent problem. In this paper, a detailed analysis of the wind energy characteristics is proposed to shape an autonomous power system for a guaranteed power supply with predominance wind energy. The analysis was carried out on the basis of wind speed measurements in the south of the European part of Russia during 8 months at different heights with a discreteness of 10 minutes. As a result, we have obtained a sequence of average daily wind speeds and the sequences constructed by arbitrary variations in the distribution of average daily wind speeds in this interval. These sequences have been used to calculate energy balances in systems (wind turbines + diesel generator + consumer with constant and limited daily energy demand) and (wind turbines + diesel generator + consumer with constant and limited daily energy demand + energy storage). In order to maximize the use of wind energy, the wind turbine integrally for the period in question is assumed to produce the required amount of energy. For the generality of consideration, we have introduced the relative values of the required energy, relative energy produced by the wind turbine and the diesel generator and relative storage capacity by normalizing them to the swept area of the wind wheel. The paper shows the effect of the average wind speed over the period on the energy characteristics of the system (wind turbine + diesel generator + consumer). It was found that the wind turbine energy produced, wind turbine energy used by the consumer, fuel consumption, and fuel economy depend (close to cubic dependence) upon the specified average wind speed. It was found that, for the same system with a limited amount of required energy and high average wind speed over the period, the wind turbines with lower generator power and smaller wind wheel radius use wind energy more efficiently than the wind turbines with higher generator power and larger wind wheel radius at less average wind speed. For the system (wind turbine + diesel generator + energy storage + consumer) with increasing average speed for a given amount of energy required, which in general is covered by the energy production of wind turbines for the period, the maximum size capacity of the storage device decreases. With decreasing the energy storage capacity, the influence of the random nature of the change in wind speed decreases, and at some values of the relative capacity, it can be neglected.

scholarly journals Wind speed in spring dominated the decrease in wind erosion across the Horqin Sandy Land in northern China

2021 ◽  
Vol 127 ◽  
pp. 107599
Author(s):  
Hanbing Zhang ◽  
Jian Peng ◽  
Chaonan Zhao ◽  
Zihan Xu ◽  
Jianquan Dong ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Erosion ◽  
Northern China ◽  
Horqin Sandy Land ◽  
Sandy Land

scholarly journals Analysis of Performance of the Wind-Driven Pulverizing Aerator Based on Average Wind Speeds in the Conditions of Góreckie Lake

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2796
Author(s):  
Andrzej Osuch ◽  
Ewa Osuch ◽  
Stanisław Podsiadłowski ◽  
Piotr Rybacki
Keyword(s):  
Mathematical Model ◽  
Wind Speed ◽  
Water Pump ◽  
Average Wind Speed ◽  
Flow Rates ◽  
Wind Speeds ◽  
Average Wind ◽  
Flow Through ◽  
Analysis Of Performance ◽  
Research Period

In the introduction to this paper, the characteristics of Góreckie lake and the construction and operation of the wind-driven pulverizing aerator are presented. The purpose of this manuscript is to determine the efficiency of the pulverizing aerator unit in the windy conditions of Góreckie Lake. The efficiency of the pulverization aerator depends on the wind conditions at the lake. It was necessary to conduct thorough research to determine the efficiency of water flow through the pulverization segment (water pump). It was necessary to determine the rotational speed of the paddle wheel, which depended on the average wind speed. Throughout the research period, measurements of hourly average wind speed were carried out. It was possible to determine the efficiency of the machine by developing a dedicated mathematical model. The latest method was used in the research, consisting of determining the theoretical volumetric flow rates of water in the pulverizing aerator unit, based on average hourly wind speeds. Pulverization efficiency under the conditions of Góreckie Lake was determined based on 6600 average wind speeds for spring, summer and autumn, 2018. Based on the model, the theoretical efficiency of the machine was calculated, which, under the conditions of Góreckie Lake, amounted to 75,000 m3 per year.

Investigation on dust dispersion during support movement in a fully mechanized mining face and the technology with support frame enclosure dust control

2021 ◽  
pp. 095440892110311
Author(s):  
Jinming Mo ◽  
Wei Ma ◽  
Dandan Li ◽  
Sheji Zhang
Keyword(s):  
Wind Speed ◽  
Field Application ◽  
Dust Concentration ◽  
Dust Control ◽  
Average Wind Speed ◽  
Dust Source ◽  
Air Inlet ◽  
Support Frame ◽  
Site Field ◽  
Mining Face

A fully mechanized mining face is characterized by serious dust pollution and dust is a major cause of pneumoconiosis that haunts numerous miners. For a fully mechanized face having large mining heights, the main dust source in the pavement area is produced by the moving support frame. To reduce the amount of dust during support's movement, the distribution and dissipation of dust in this process were studied by combining numerical simulations with underground measurements. The results showed that with an increase of the distance from the air inlet, the wind speed of the sidewalk in the fully mechanized face first increased, then decreased, and finally increased again. At the position of the coal cutter, the highest wind speed was 1.78 m/s and the average wind speed of the roadway was about 0.8 m/s. The dust concentration at the dust source was >1000 mg/m3. An area with a high dust concentration and having a length of 15 m was formed on the rooftop, together with a 50 m long dust belt with a dust concentration of 300 to 450 mg/m3 in the pavement area of 10 m from the dust source. Beyond the 45 m radius from the dust source, the dust concentration was stable at about 250 mg/m3. Based on the dust production characteristics of the support frame, an enclosed dust-guiding device was designed and structure-optimized. Based on the on-site field application test results, it was found that the device has a satisfactory dust-guiding effect during support movement and the dust suppression rate near the dust source reached 94.8%.

Calculation of Weibull Distribution parameters at low wind speed and performance analysis

2021 ◽  
pp. 1-24
Author(s):  
Yusuf Alper Kaplan
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Weibull Distribution ◽  
Energy Potential ◽  
Average Wind Speed ◽  
Statistical Indicator ◽  
Low Wind Speed ◽  
Distribution Parameters ◽  
Wind Energy Potential ◽  
And Performance

In this study, the compatibility of the real wind energy potential to the estimated wind energy potential by Weibull Distribution Function (WDF) of a region with low average wind speed potential was examined. The main purpose of this study is to examine the performance of six different methods used to find the coefficients of the WDF and to determine the best performing method for selected region. In this study seven-year hourly wind speed data obtained from the general directorate of meteorology of this region was used. The root mean square error (RMSE) statistical indicator was used to compare the efficiency of all used methods. Another main purpose of this study is to observe the how the performance of the used methods changes over the years. The obtained results showed that the performances of the used methods showed slight changes over the years, but when evaluated in general, it was observed that all method showed acceptable performance. Based on the obtained results, when the seven-year data is evaluated in this selected region, it can be said that the MM method shows the best performance.

Sign in / Sign up

Export Citation Format

Share Document