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Zhang M.,Inner Mongolia Normal University | Zhang R.-Q.,Institute of Water Resources for Pastoral Area | Qi T.,Inner Mongolia University | Xie Y.-H.,Inner Mongolia Normal University | And 2 more authors.
Advanced Materials Research | Year: 2014

The rainfall is the main soil water supply to the soil of desert-steppe. It divides into three parts, evaporation, infiltration and runoff, after falling on to the surface. Those three parts are affected by many factors. Studies of rainfall division in desert-steppe were rare, the proportions of evaporation, infiltration and runoff are uncertain. So Under the condition of different vegetation, we conduct six times rainfall simulation experiment under different rainfall intensity. Simulation shows that rainfall process, the surface coverage and soil condition affect division. The evaporation section of rainfall accounted for 1/2 ~ 2/3. Infiltration section accounted for 30% ~ 50%. Runoff is the smallest. The rainfall intensity plays a decisive role on the runoff. Different vegetation coverage, division proportion is different. The interception and delay function of vegetation main effect evaporation and runoff, it can make the evaporation increased to more than 70%, reduce runoff to a third. Water content of soil profile before rainfall is the main factors affecting infiltration volume. The soil moisture before rain affects the infiltration rate at the beginning of rainfall. If rainfall duration is long enough, infiltration capacity is almost a constant. © (2014) Trans Tech Publications, Switzerland. Source

Li J.-R.,Beijing Forestry University | Sun B.-P.,Beijing Forestry University | Gao Y.,Inner Mongolia Agricultural University | Wang T.-S.,Beijing Forestry University | And 2 more authors.
Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of Technology | Year: 2010

With the theoretical basis of aerodynamics, using fluid dynamics software (Fluent), simulated examination has been performed to analyze near-surface air currents, wind speed profile and windbreak performance of sand-bag barrier with different sizes. The results show that, below the surface of 0.5m height, the changes of wind profile of monitored section are consistent, with little difference, but the wind speed decreases between 0.5~2.0m height. There are clearly three partitions of the near-surface air: accelerated upwards area, low-speed sink area and low-speed recirculation zone. They are located in front of the sand barrier protection projects, above the top of the protection zone and inside the barrier, respectively. In low-speed recirculation zone, there exist two horizontal axis eddy current and the velocity at eddy center is minimum. In addition, it can be seen that 0.5m height is a critical point to distinguish factors of affecting wind speed. In the range of 0~0.5m, the height of sand barrier is the main factor of wind speed, while in the range of 0.5~2.0m, the size of sand barrier is the main factor. Considering comprehensively the above factors, it is realized that the sand-bag barrier with 2m×2m size has the most remarkable protective effect. Source

Wang S.-F.,Institute of Water Resources for Pastoral Area | Wu Y.-Z.,Institute of Water Resources for Pastoral Area
ICMREE2011 - Proceedings 2011 International Conference on Materials for Renewable Energy and Environment | Year: 2011

The rapid development of wind farms construction, wind resource assessment is correct or not directly affect the future effectiveness of wind farms is good or bad. Wind resources in the slope of the windward slope, the wind speed climbing effect makes the wind velocity increases.On the windward slope, the wind resource at each location varied widely. Therefore, the windward slope actual wind speed at any position have to use the measured data at the bottom and top of mountains according to wind speed changes of slope to Calculate. This article discusses how to obtain more actual wind speed at distances on different slope and the slope of at each location. © 2011 IEEE. Source

Liu T.,Institute of Water Resources for Pastoral Area | Huang Y.,Institute of Water Resources for Pastoral Area | Zhang R.,Institute of Water Resources for Pastoral Area | Li J.,Inner Mongolia Medical College
2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011 - Proceedings | Year: 2011

Black land situates seasonal permafrost in our country, in order to further study the diversification of soil structure and the affect for water-soil erosion in the role of freeze-thaw cycle on the black land, this paper has test on the status of field soil thermal motion of water on the black land within Ulanhot of Inner Mongolia, the variation of soil temperature and water content has been analyzed in the change of weather index on the land surface, the features of soil freeze-thaw and changes in water and heat has also been reached conclusion, thus, the theoretical basis on the watersoil erosion has been provided for agricultural development and the prevention of freeze-thaw effect in the region. © 2011 IEEE. Source

Wu J.B.,Institute of Water Resources for Pastoral Area | Wei Y.F.,Institute of Water Resources for Pastoral Area | Guo K.Z.,Institute of Water Resources for Pastoral Area | Lian X.W.,Institute of Water Resources for Pastoral Area
Applied Mechanics and Materials | Year: 2013

24 periods of 10-day hierarchy schemes of the vegetation coverage of Turks County within 3 years are obtained through inversion, and annual change and interannual change of the vegetation coverage of Turks County are analyzed. The result demonstrates that the average vegetation coverage of the whol e county is about 40%~45% during the returning green period, the peak value of the vegetation coverage appears in the last ten days of Jul y, and the highest vegetation coverage of the three years is as high as 60% or above. During the past 12 years, the vegetation change of Turks County is stable-based that accounts for 39.6% of the total area of the county, the area of grassland sl ightly recovered equals to that of grassl and sl ightl y degraded, and the total of both l ands is 39.1% of the whol e county while the area of grassland significantl y degraded accounts for onl y 8.7%. © (2013) Trans Tech Publications, Switzerland. Source

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