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无定河流域悬移质有效输沙流量分析 被引量:6
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作者 马元旭 许炯心 黄河清 《泥沙研究》 CSCD 北大核心 2010年第3期73-80,共8页
本文利用无定河实施水土保持措施前11年(1959-1969年)的日平均流量和日平均含沙量资料,计算了无定河及其支流共12条河流的有效输沙流量。由于流量之间的不连续性,首先将各站所有的流量分为两组:小流量级和大流量级。将小流量级别的流量... 本文利用无定河实施水土保持措施前11年(1959-1969年)的日平均流量和日平均含沙量资料,计算了无定河及其支流共12条河流的有效输沙流量。由于流量之间的不连续性,首先将各站所有的流量分为两组:小流量级和大流量级。将小流量级别的流量分别以该流量级的1、3/4、1/2、1/4标准差为间隔进行分级。对于大流量,如果相邻的流量差在对应的小流量间隔内,将其归为一级。然后计算每级流量的输沙量,最大输沙量对应的流量为有效输沙流量。结果发现风沙区河流的有效输沙流量与黄土丘陵沟壑区和河源梁峁沟涧区河流的有效输沙流量之间存在着很大的区域差异。在四种分级间隔下,黄土丘陵沟壑区和河源梁峁沟涧区河流的有效输沙流量一般均出现在大洪水流量范围内,风沙区河流的有效输沙流量出现在小流量范围内。流量分级间隔的大小对风沙区河流的有效输沙流量的历时百分比有着较大的影响。不同地貌区域河流有效输沙流量的差异主要与流量过程和含沙量有关。 展开更多
关键词 无定河 有效输沙流量 水流历时 流量分级 流量过程 高含沙水流
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Response of Flash Flood Early Warning Critical Rainfall to Storm Pattern in South Branch of Censhui Watershed
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作者 Changzhi Li Baozhao Yuan +2 位作者 Miao Zhang Changjun Liu Dongya Sun 《Journal of Environmental Science and Engineering(B)》 2015年第12期637-648,共12页
Critical rainfall estimation for early warning of rainstorm-induced flash flood is an inverse rainstorm-runoff process based on warning discharge threshold for a warning station of interest in a watershed. The key asp... Critical rainfall estimation for early warning of rainstorm-induced flash flood is an inverse rainstorm-runoff process based on warning discharge threshold for a warning station of interest in a watershed. The key aspects of critical rainfall include rainfall amount and rainfall duration. Storm pattern affects highly the estimation of critical rainfall. Using hydrological modeling technique with detailed sub-basin delineation and manual for design rainstorm-runoff computation, this study first introduced basic concept and analysis methods on critical rainfall for flash flood early warning, then, investigated the responses of flash flood warning critical rainfall to storm pattern. Taking south branch of Censhui watershed in China as an example, critical rainfall in case of typical storm patterns for early warning of rainstorm-induced flash flood were estimated at 3 warning stations. This research illustrates that storm pattern plays important role in the estimation of critical rainfall and enough attention should also be paid to storm pattern when making a decision on whether a warning to be issued or not. 展开更多
关键词 Flash flood early warning critical rainfall storm pattern response.
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Projection and Historical Analysis of Hydrological Circulation in Sittaung River Basin, Myanmar
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作者 Takao Yamashita Htay Aung 《Journal of Civil Engineering and Architecture》 2016年第6期736-742,共7页
Based on the comparison between several model outputs from CMIP5 (Coupled Model Intercomparison Project Phase-5) and the satellite rainfall mapping data of GSMaP (global satellite mapping of precipitation), This p... Based on the comparison between several model outputs from CMIP5 (Coupled Model Intercomparison Project Phase-5) and the satellite rainfall mapping data of GSMaP (global satellite mapping of precipitation), This paper selected MIROC4h as a future projection of rainfall in the Sittaung River basin, Myanmar, with the fine spatial resolution of 0.5°. At first, MIROC4h projection towards 2035 was corrected by using the error trend (GSMaP-MIROC4h) for nine years over-rapping of both outputs from 2006 to 2014. Assuming the seasonal autoregressive processes, future error trend at each grid point was estimated by the time series forecast of SARMAP processes using the nine years training data. Then future projection correction was done by M1ROC4h output plus error trend at each grid point to obtain the corrected MIROC4h precipitation. As a historical analysis, using the corrected precipitation in the Sittaung River basin and observed river discharge at the outlet of the river, the hydrological model (HSPF (Hydrological Simulation Program Fortran)) calibration was carried out with consideration of the water utilization data for darn/reservoir and irrigation. As a projection analysis, future simulation of hourly discharge at the outlet of Sittaung River from 2015 to 2035 was conducted by using the corrected MIROC4h precipitation. The results of projection analysis show that high risks of flood will appear in 2023 and 2028 and the risks of draught will be expected in 2019-2021. 展开更多
关键词 Hydrological simulation HSPF CMIP5 MIROC4h TRMM GSMaP.
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