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| 1 | Measuring the Internal Velocity of Debris Flows Using Impact Pressure Detecting in the Flume Experiment显示文摘Measuring the internal velocity of debris flows is very important for debris flow dynamics research and designing debris flow control works. However, there is no appropriate method for measuring the internal velocity because of the destructive power of debris flow process. In this paper, we address this problem by using the relationship between velocity and kinetic pressure, as described by surface velocity and surface kinetic pressure data. Kinetic pressure is the difference of impact pressure and static pressure. The former is detected by force sensors installed in the flow direction at the sampling section. Observations show that static pressure can be computed using the formula for static water pressure by simply substituting water density for debris flow density. We describe the relationship between surface velocity and surface kinetic pressure using data from seven laboratory flume experiments. It is consistent with the relationship for single phase flow, which is the measurement principle of the Pitot tube. | YANG Hongjuan WEI Fangqiang HU Kaiheng Sergey CHERNOMORETS HONG Yong LI Xiaoyu XIE Tao | 2011 | Journal of Mountain Science2011，8，2： | 12 |
| 2 | Experimental Research of Reinforced Concrete Buildings Struck by Debris Flow in Mountain Areas of Western China显示文摘It's very important to simulate impact load of debris flow ef-fectively and to investigate dynamic response of architectures under dy-namic impact of debris flow,which are necessary to design disaster miti-gation construction. Firstly,reinforced concrete domestic architectures in mountain areas of western China had been chosen as main architecture style. The bearing load style and the destructed shape of reinforced framed construction impacted by discontinuous viscous debris flow were studied systematically. Secondly,Jiangjia Ravine debris flow valley in Yunnan Province,China had been chosen as research region. Utilizing based data from fieldwork and practical survey,the authors simulated and calculated theoretically impact force of discontinuous viscous debris flow. Thirdly,an impact data collecting system(IMHE IDCS) was designed and developed to fulfill designed simulation experiments. Finally,a series of impact test of researched structure models had been fulfilled. During experiment,the destructed shape and course of models were observed and the dynamic displacement data and main natural frequency data of models were col-lected and analyzed. | ZHANG Yu WEI Fangqiang WANG Qing | 2007 | Wuhan University Journal of Natural Sciences2007，12，4： | 7 |
| 3 | Model and Method of Debris Flow Risk Zoning Based on Momentum Analysis显示文摘A model of debris flow risk zoning is carried out with momentum analysis of debris flow. This model zones the debris flow inundation fan with density and velocity calculated by numerical simulation. The risk classification standard is determined according to the ultimate bearing capacities of different structures under impacting. And the ultimate bearing capacities are tested by impact failure experiment of destruction. Two structures typical in Chinese mountain towns, reinforced concrete frame construction and brickwork with concrete, are chosen in the experiment. The model makes debris flow risk zoning quantitative and the results comparable widely. The results differ much from that of other methods especially in the identification of medium and low risk zones. | WEI Fangqiang ZHANG Yu HU Kaiheng GAO Kechang | 2006 | Wuhan University Journal of Natural Sciences2006，11，4： | 5 |
| 4 | Calculation of the debris flow concentration based on clay content显示文摘The debris flow clay content has very tremendous influence on its concentration (γC). It is reported that the concentration can be calculated by applying the relative polynomial based on the clay content. Here one polynomial model and one logarithm model to calculate the concentration based on the clay content for both the ordinary debris flow and viscous debris flow are obtained. The result derives from the statistics and analysis of the relationship between the debris flow concentrations and clay content in 45 debris flow sites located in the southwest of China. The models can be applied for the concentration calculation to those debris flows that are impossible to observe. The models are available to calculate the debris flow concentration, the principles of which are in the clay content affecting on the debris flow formation, movement and suspending particle diameter. The mechanism of the relationship of the clay content and concentration is clear and reliable. The debris flow is usually of micro-viscous when the clay content is low (<3%), by analyzing the developing tendency on the basics of the relationship between the clay content and debris flow concentration. Indeed, the less the clay content, the less the concentration for most debris flows. The debris flow tends to become the water rock flow or the hyperconcentrated flow with the clay content decrease. Through statistics it is apt to transform the soil into the viscous debris flow when the clay content of ranges is in 3%-18%. Its concentration increases with the increasing of the clay content when the clay content is between 5% and 10%. But the value decreases with the increasing of the clay content when the clay content is between 10% and 18%. It is apt to transform the soil into the mudflow, when the clay content exceeds 18%. The concentration of the mudflow usually decreases with the increase of the clay content, and this developing tendency reverses to that of the micro-viscous debris flow. There is maximum mean concentration for the debris flow when the clay content ranges are between 7% and 11%. Especially, for the viscous debris flow, the logarithm formula here is suitable to the concentration calculation with the clay content between 3% and 18%. The maximum concentration calculated by this formula reaches 2.32 t/m3, which matches that tested in practice. | CHEN Ningsheng, CUI Peng, LIU Zhonggang & WEI Fangqiang Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China | 2003 | Science China(Technological Sciences)2003，46，z1： | 4 |
| 5 | A Model of Debris Flow Forecast Based on the Water-Soil Coupling Mechanism显示文摘Debris flow forecast is an important means of disaster mitigation. However, the accuracy of the statistics-based debris flow forecast is unsatisfied while the mechanism-based forecast is unavailable at the watershed scale because most of existing researches on the initiation mechanism of debris flow took a single slope as the main object. In order to solve this problem, this paper developed a model of debris flow forecast based on the water-soil coupling mechanism at the watershed scale. In this model, the runoff and the instable soil caused by the rainfall in a watershed is estimated by the distributed hydrological model(GBHM) and an instable identification model of the unsaturated soil. Because the debris flow is a special fluid composed of soil and water and has a bigger density, the density estimated by the runoff and instable soil mass in a watershed under the action of a rainfall is employed as a key factor to identify the formation probability of debris flow in the forecast model. The Jiangjia Gulley, a typical debris flow valley with a several debris flow events each year, is selected as a case study watershed to test this forecast model of debris flow. According the observation data of Dongchuan Debris Flow Observation and Research Station, CAS located in Jiangjia Gulley, there were 4 debris flow events in 2006. The test results show that the accuracy of the model is satisfied. | Shaojie Zhang Hongjuan Yang Fangqiang Wei Yuhong Jiang Dunlong Liu | 2014 | Journal of Earth Science2014，25，4： | 4 |
| 6 | Grain Composition and Erosive Equilibrium of Debris Flows显示文摘Debris flows consist of grains of various sizes ranging from 10^(-6) m ~1 m. Field observations in the Jiangjia Gully (JJG) and other sites throughout China indicate that the grain size distribution of sediment in debris flows can be characterized by an exponential function fit to the cumulative distribution. The exponent value for the function varies by location and may be useful in distinguishing between debris flows from different valleys. For example, minimum values and ranges of the exponent are associated with the high frequency of debris flows in the JJG. Furthermore, the distribution presents piecewise fractality (i.e. scaling laws hold in various ranges of the grain size) and we propose that the fractal structure determines the matrix and that the fractal dimension plays a crucial role in material exchange between a debris flow and the substrate it flows over. Finally, the empirical data support an exponential relation between grain composition and non-dimensional shear stress for the critical state of the channel. Overall we propose a material-determinism approach to studying debris flows which contrasts with the enviro-determinism that has dominated much recent work in this field. | LI Yong LIU Jingling CHEN Xiaoqing WEI Fangqiang | 2007 | Journal of Mountain Science2007，4，1： | 3 |
| 7 | Regional Prediction of Impending Debris Flow Based on Doppler Weather Radar显示文摘Debris flow prediction is one of the important means to re-duce the loss caused by debris flow. This paper built a regional predic-tion model of impending debris flow based on regional environmental background(including topography,geology,land use,and etc.) ,rainfall and debris flow data. A system of regional prediction of impending de-bris flow was set up on ArcGIS 9.0 platform according to the model. The system used forecast precipitation data of Doppler weather radar and observational precipitation data as its input data. It could provide a prediction about the possibility of debris flow one to three hours before it happened,and was put into use in Liangshan Meteorological Obser-vatory in Sichuan province in the monsoon of 2006. | JIANG Yuhong WEI Fangqiang ZHANG Jinghong GU Linkang DENG Bo LIU Hongjiang | 2007 | Wuhan University Journal of Natural Sciences2007，12，4： | 3 |
| 8 | Effects of thiosulfate and dissolved oxygen on crevice corrosion of Alloy 690 in high-temperature chloride solution显示文摘The crevice corrosion behavior of Alloy 690 was investigated in high-temperature chloride solution containing different concentrations of thiosulfate(S_(2)O_(3)^(2-)) and dissolved oxygen(DO). The S2O32- inhibited corrosion of Alloy 690 through consuming oxygen in aerated chloride solution. In deaerated chloride solution,the S_(2)O_(3)^(2-) was reduced to S° and S^(2-) and subsequently incorporated into the oxide films, which promoted the pitting corrosion at locations of both TiN inclusions and matrix inside the crevice during the crevice corrosion as well as influenced the composition and thickness of the oxide films. The effect mechanisms of S_(2)O_(3)^(2-) and DO on crevice corrosion in high-temperature chloride solution are discussed. | Fangqiang Ning Jibo Tan Ziyu Zhang Xinqiang Wu Xiang Wang En-Hou Han Wei ke | 2021 | Journal of Materials Science & Technology2021，，7： | 2 |
| 9 | Probability Forecast of Regional Landslide Based on Numerical Weather Forecast显示文摘The regional forecast of landslide is one of the key points of hazard mitigation. It is also a hot and difficult point in research field. To solve this problem has become urgent task along with Chinese economy fast development. This paper analyzes the principle of regional landslide forecast and the factors for forecasting. The method of a combination of Information Value Model and Extension Model has been put forward to be as the forecast model. Using new result of Numerical Weather Forecast Research and that combination model, we discuss the implementation feasibility of regional landslide forecast. Finally, with the help of Geographic Information System, an operation system for southwest of China landslide forecast has been developed. It can carry out regional landslide forecast daily and has been pilot run in NMC. Since this is the first time linking theoretical research with meteorological service, further works are needed to enhance it. | GAO Kechang WEI Fangqiang CUI Peng HU Kaiheng XU Jing ZHANG Guoping BI Baogu | 2006 | Wuhan University Journal of Natural Sciences2006，11，4： | 2 |
| 10 | Soil Organic Carbon Loss under Different Slope Gradients in Loess Hilly Region显示文摘Based on field runoff plots observation and sample analysis,the effect of slope gradient on soil organic carbon loss was studied under natural rainfall conditions in loess hilly region. The results showed that with slope gradient increasing(from10° to 30°) ,the changing trend of soil erosion intensity(A) was A20°>A30°>A 15°>A10°>A25°,suggesting that slope gradient between 20° and 25° was a critical degree ranger to exist. Soil organic car-bon loss was mainly influenced by soil erosion intensity,appearing the same trend as did soil erosion intensity with increasing slope gradient. Soil erosion results in organic carbon enrichment in sediment. Average enrichment ratios of five runoff plots varied from 2.27 to 3.74,and decreased with increasing erosion intensity and slope gradient. The decrease of surface runoff and soil erosion is the key to reduce soil organic carbon loss. | JIA Songwei HE Xiubin WEI Fangqiang | 2007 | Wuhan University Journal of Natural Sciences2007，12，4： | 1 |
| 11 | A new type debris flow water-sediment separation structure and its model test显示文摘 | XIE Tao YANG Hongjuan WEI Fangqiang | 2014 | Bulletin of Engineering Geology and the Environment2014，73，4： | 1 |
| 12 | Monitoring of Land-Cover Dynamic Change in Lancangjiang River Cascaded Hydropower Area显示文摘The analysis of the 3 stages’ (1988,1996,2000) variation of land-cover is performed according to Thematic Mapper (TM) and Enhancement Thematic Mapper(ETM) satellite image by combining ground GIS database with GPS field collected data in the area of Xiaowan-Dachaoshan Reservoirs of Lancangjiang River cascaded Hydropower Area. Consequently, the land-cover is divided into five subclasses, namely water, paddy field and wetland, bare dryland and sparse shrub, secondary forest and density forest. The result showed that the areas of bare land, upland and secondary forest decreased in 1988-1996, whereas from 1996 to 2000, water body and density forest keep invariability while the areas of paddy field and wetland, bare dryland and sparse scrub increasing and the area of secondary forest decrease; Features of reciprocal transformation between density forest and other type of land-cover had two points, i.e. secondary forest, bare dryland and sparse shrub converted to density forest; and density forest converted to secondary forest and paddy field and wetland. It reflects the dynamic variation of density forest; the area which slope less than 8° and greater than 15° shows bigger variation, however, less change in 8°-15°. | LIU Hongjiang XIE Hongzhong CHEN Lihui GAN Shu ZHANG Jun WEI Fangqiang | 2006 | Wuhan University Journal of Natural Sciences2006，11，4： | 1 |
| 13 | A Decision Support System for Debris-Flow Hazard Mitigation in Towns Based on Numerical Simulation:A Case Study at DongChuan,Yunnan Province显示文摘 | Wei Fangqiang Hu kaiheng Guan Qun | 2008 | Int J Risk Assessment and Manage-ment2008，8，4： | 1 |
| 14 | True-color real-time imaging and spectroscopy of carbon nanotubes on substrates using enhanced Rayleigh scattering显示文摘白光照亮的围单人赛的碳 nanotubes (SWCNT ) 应该由于散布的回声瑞利显得有颜色。然而,底层上的 SWCNT 的真彩成像没被报导,因为 SWCNT 和散布的强壮的底层的极其低的散布紧张。这里,我们证明散布的瑞利能被接口偶极子改进效果极大地提高。底层上的因而丰富多彩的 SWCNT 能被宽地 supercontinuum 激光照明直接在一台光显微镜下面想象,它便于单个 SWCNT 的高产量 chirality 赋值。这条途径,称为的瑞利成像显微镜学,没被限制为 SWCNT,但是对许多 nanomaterials 广泛地适用,它使丰富多彩的 nanoworld 能在光显微镜下面被探索。 | Wenyun Wu Jingying Yue Xiaoyang Lin Dongqi Li Fangqiang Zhu Xue Yin Jun Zhu Jiangtao Wang Jin Zhang Yuan Chen Xinhe Wang Tianyi Li Yujun He Xingcan Dai Peng Liu Yang wei Jiaping Wang Wei Zhang Yidong Huang Li Fan Lina Zhang Qunqing Li Shoushan Fan Kaili Jiang | 2015 | Nano Research2015，8，8： | 1 |
| 15 | Real-rime measure and preliminary analysis of debris flow impact force at Jiangjia Ra- vine,China 显示文摘 | HU Kaiheng WEI Fangqiang LI Yong | 2011 | Earth Surface Process and Landforms2011，36，9： | 1 |
| 16 | Relationships between debris flows and earth surface factors in Southwest China显示文摘 | Fangqiang Wei Kechang Gao kaiheng Hu | 2008 | Environmental Geology2008，55，3： | 1 |
| 17 | Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China 显示文摘 | Hu Kaiheng Wei Fangqiang Li Yong | 2011 | Earth Surface Processes And Landforms2011，36，： | 1 |
| 18 | Mean Velocity Estimation of Viscous Debris Flows显示文摘The mean velocity estimation of debris flows, especially viscous debris flows, is an important part in the debris flow dynamics research and in the design of control structures. In this study, theoretical equations for computing debris flow velocity with the one-phase flow assumption were reviewed and used to analyze field data of viscous debris flows. Results show that the viscous debris flow is difficult to be classified as a Newtonian laminar flow, a Newtonian turbulent flow, a Bingham fluid, or a dilatant fluid in the strict sense. However, we can establish empirical formulas to compute its mean velocity following equations for Newtonian turbulent flows, because most viscous debris flows are turbulent. Factors that potentially influence debris flow velocity were chosen according to two-phase flow theories. Through correlation analysis and data fitting, two empirical formulas were proposed. In the first one, velocity is expressed as a function of clay content, flow depth and channel slope. In the second one, a coefficient representing the grain size nonuniformity is used instead of clay content. Both formulas can give reasonable estimate of the mean velocity of the viscous debris flow. | Hongjuan Yang Fangqiang Wei Kaiheng Hu | 2014 | Journal of Earth Science2014，25，4： | 1 |
| 19 | Distribution charac- teristics of landslides and debris flows in the Wenchuan earthquake region before and after the earthquake 显示文摘 | Wei Fangqiang Su Pengcheng Jiang Yuhong | 2012 | Disaster Advances2012，5，4： | 1 |
| 20 | Distribution characteristics of debris flows and landslides in Three Rivers Parallel Area 显示文摘 | Ding Mingtao Wei Fangqiang | 2011 | Disaster Ad- vances2011，4，3： | 1 |
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