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长江下游黑沙洲南水道河床演变及碍航特性 被引量:4
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作者 牛晨曦 假冬冬 张幸农 《水运工程》 北大核心 2017年第9期159-164,共6页
依据河道实测水文、地形资料对长江下游黑沙洲水道河床演变和碍航特性进行深入分析,初步提出该河段的航道整治思路。分析表明:大水年尤其是特大洪水年,河床冲淤变化相对较大,南水道过渡段左槽冲刷、右槽中下段淤积现象明显。主要原因是... 依据河道实测水文、地形资料对长江下游黑沙洲水道河床演变和碍航特性进行深入分析,初步提出该河段的航道整治思路。分析表明:大水年尤其是特大洪水年,河床冲淤变化相对较大,南水道过渡段左槽冲刷、右槽中下段淤积现象明显。主要原因是洪水期南水道过渡段漫滩水流增强,左槽分流沿程增加、右槽分流沿程减小,江中心滩束流作用有限,处于缓流区的右槽下段输沙能力不足,汛后冲刷不充分。航道整治的基本思路为稳定相对有利的滩槽格局,拦截漫滩水流、限制左槽的进一步冲刷发展、增强南水道右槽水流的冲刷能力。 展开更多
关键词 河床演变 碍航特性 航道整治 黑沙洲南水道
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Research on underwater acoustic channel estimation and temperature factors based on FBMC 被引量:1
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作者 GUO Yin-jing LIU Zhen +2 位作者 YANG Wen-jian niu chen-xi LIU Hui 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第2期197-204,共8页
The complexity of underwater environment poses a challenge to underwater acoustic communication.In marine environment,different temperatures,depths and salinities would affect the performance of acoustic communication... The complexity of underwater environment poses a challenge to underwater acoustic communication.In marine environment,different temperatures,depths and salinities would affect the performance of acoustic communication.The analysis of the underwater acoustic channel under the influence of temperature factors provides a reference for further study of the underwater acoustic channel estimation problem based on filter bank multi-carrier(FBMC).The FBMC based offset quadrature amplitude modulation(OQAM)technology(FBMC/OQAM)was introduced into the underwater acoustic communication.Based on FBMC,the underwater acoustic channel estimation technology was studied.By changing the pilot structure to adapt to the complex and variable underwater acoustic channel,the iterative method was used to obtain the channel information with higher accuracy and further improve the performance of channel estimation.Theoretical analysis and simulation results show that iterative channel estimation algorithm based on the new interference approximation method(IAM)pilot proposed in this paper has better performance in underwater acoustic channel. 展开更多
关键词 filter bank multi-carrier(FBMC) underwater acoustic channel estimation TEMPERATURE PILOT interference approximation method(IAM)
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