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您的检索式：作者名="Liu Fanggui"
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| 1 | Calculation of watershed flow concentration based on the grid drop concept显示文摘The grid drop concept is introduced and used to develop a micromechanism-based methodology for calculating watershed flow concentration. The flow path and distance traveled by a grid drop to the outlet of the watershed are obtained using a digital elevation model (DEM). Regarding the slope as an uneven carpet through which the grid drop passes, a formula for overland flow velocity differing from Manning’s formula for stream flow as well as Darcy’s formula for pore flow is proposed. Compared with the commonly used unit hydrograph and isochronal methods, this new methodology has outstanding advantages in that it considers the influences of the slope velocity field and the heterogeneity of spatial distribution of rainfall on the flow concentration process, and includes only one parameter that needs to be calibrated. This method can also be effectively applied to the prediction of hydrologic processes in un-gauged basins. | Rui Xiaofang Yu Mei Liu Fanggui Gong Xinglong | 2008 | Water Science and Engineering2008，1，1： | 9 |
| 2 | Risk analysis for earth dam overtopping显示文摘In this paper, a model of overtopping risk under the joint effects of floods and wind waves, which is based on risk analysis theory and takes into account the uncertainties of floods, wind waves, reservoir capacity and discharge capacity of the spillway, is proposed and applied to the Chengbihe Reservoir in Baise City in Guangxi Zhuang Autonomous Region. The simulated results indicate that the flood control limiting level can be raised by 0.40 m under the condition that the reservoir overtopping risk is controlled within a mean variance of 5×10-6. As a result, the reservoir storage will increase to 16 million m3 and electrical energy generation and other functions of the reservoir will also increase greatly. | Mo Chongxun Liu Fanggui Yu Mei Ma Rongyong Sun Guikai | 2008 | Water Science and Engineering2008，1，2： | 5 |
| 3 | Discussion of Muskingum method parameter X显示文摘The parameter X of the Muskingum method is a physical parameter that reflects the flood peak attenuation and hydrograph shape flattening of a diffusion wave in motion.In this paper,the historic process that hydrologists have undergone to find a physical explanation of this parameter is briefly discussed.Based on the fact that the Muskingum method is the second-order accuracy difference solution to the diffusion wave equation,its numerical stability condition is analyzed,and a conclusion is drawn:X ≤ 0.5 is the uniform condition satisfying the demands for its physical meaning and numerical stability.It is also pointed out that the methods that regard the sum of squares of differences between the calculated and observed discharges or stages as the objective function and the routing coefficients C 0,C 1 and C 2 of the Muskingum method as the optimization parameters cannot guarantee the physical meaning of X. | Rui Xiaofang Liu Fanggui Yu Mei | 2008 | Water Science and Engineering2008，1，3： | 3 |
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