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Li P.,Xian University of Technology | Li Z.,Xian University of Technology | Li Z.,CAS Institute of Soil and Water Conservation | Zheng L.,Shandong Survey and Design Institute of Water Conservancy
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | Year: 2010

Relation between water erosion dynamics and sediment yield is one of the key problem in soil erosion prediction. In this study, flow dynamics (inculding flow velocity, shear stress and energy consumption) were studied by runoff scouing on smooth flume and soil flume. Results indicated that sheet flow on smooth slope moved in roll waves, flow velocity fluctuated along the flume, and increased with runoff discharge and slope gradient. Runoff shear stress, runoff energy consumption and sediment transportation of unit width runoff increased with runoff discharge, and changed in parabola shape with slope gradient, which indicated the existance of critical slope gredient. In this experiment, critical slope gredient was between 21-24°. Further analysis showed that linear relation existed between sediment transportation and runoff shear stress, runoff energy consumption of unit width runoff.

Yang L.Q.,University of Jinan | Qin B.,Shandong Survey and Design Institute of Water Conservancy
Applied Mechanics and Materials | Year: 2014

It is rather complicated to predict the characteristics of strata response to mining operation in thick seams. However, a comprehensive evaluation of ground behavior is a prerequisite for maintaining efficient production, especially when the top-coal-caving method behind the face is applied. An analysis of the conditions of top coal has revealed that a 1.8m thick layer of coal just above the shield supports is well fractured. However, a 4.2m thick layer of coal above the fractured part is either not fractured or is fractured in the form of large blocks leading to obstruction of windows of shields during coal drawing. It is concluded that, in order to decrease dilution and increase extraction ratio and efficiency of operation, top coal should be as uniformly fractured as possible. Hence, an efficient and continuous coal flowing behind the face can be maintained. © (2014) Trans Tech Publications, Switzerland.

Yang L.Q.,University of Jinan | Qin B.,Shandong Survey and Design Institute of Water Conservancy | Ma J.,University of Jinan
Progress in Civil, Architectural and Hydraulic Engineering - Selected Papers of the 4th International Conference on Civil, Architectural and Hydraulic Engineering, ICCAHE 2015 | Year: 2016

Nansi Lake is a famous shallow lake in China. It is very important to know the water level and runoff of different sections at different times for engineer. A new calculating method has been proposed, which is called three lakes and two rivers model. Because Nansi Lake is divided into three parts, western part, lake surface, and eastern part. There are two narrow rivers to connect the three pats. In the model, water balance equations are used to instead of continuity equations. The auxiliary curve is used to instead of momentum equation to reflect the river channel storage volume and the approximate relationship between outflow and inflow. Iteration formula is provided in the paper. The numerical calculation methods were used to verify that two rivers and three lakes model is of high precision and the calculation is simple and practical. © 2016 Taylor & Francis Group, London.

Li X.,North China University of Water Conservancy and Electric Power | Liu D.,Shandong Survey and Design Institute of Water Conservancy
International Journal of Applied Environmental Sciences | Year: 2013

Based on the vulnerability research at home and abroad, from the perspective of affecting factors water system vulnerability, a hierarchical model of water system vulnerability assessment using the analytic hierarchy process is established. Using the special vulnerability and nature vulnerability as a criterion layer, surface water, groundwater, environmental, economic and social factors and comprehensive factors are selected as solution layer, the 5 main impact indicators were screened out of as vulnerability. AHP and comprehensive weight method are adopted to calculate the weights to establish water vulnerability evaluation system under a changing environment index. And Handan City as an example, fuzzy clustering method and comprehensive evaluation method are adopted to evaluate the vulnerability of water resources in Handan City. © Research India Publications.

Dedong L.,Shandong Survey and Design Institute of Water Conservancy | Zhu R.,CAS Institute of Geographical Sciences and Natural Resources Research | Jinyan L.,Bengbu Survey and Design Institute of Water Conservancy | Juan Z.,Yellow River Investigation and Design Institute of Shandong
International Journal of Advancements in Computing Technology | Year: 2012

Hydrographic zones partitioning is the critical issue in hydrological station network planning and a hydrographic zones partition method that can divide the hydrographic zones objectively is desirable for any region. As a kind of pattern classification problem, the hydrographic zones partitioning of Shandong province is achieved by the self-organizing feature map neural network (SOFM network) which has been successfully applied to pattern classification problems. Based on 50 hydrological stations and 8 basic factors which reflect the land surface and hydroclimate characteristics, Shandong province is automatically divided into 2 hydrographic zones by SOFM network. The average watershed characteristics of each sub-zone are consistent with the local terrain and surface conditions. And based on the partitioning results of SOFM network method, the maximum peak flow and the accuracy are analyzed which are proved reasonable and achieve pass rate of 82%. Which indicate that it is an effective method to use SOFM neural network to divide the hydrographic zones.

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