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Search Results: 1 - 10 of 274530 matches for " 李宇男 "
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基于MISOHRM模型的非一致性洪水频率计算方法及应用II: 西江中游水文要素时空变异规律
Algorithm and Application of Inconsistent Flood Frequency Based on the MISOHRM Model (II): Temporal and Spatial Alteration Analysis
 [PDF]

, 谢平, 许斌,
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.15047
Abstract:

西江中游由于缺乏湖泊对洪水的调蓄,加之防洪堤不断地加高加固引起洪水归槽,加强了洪水遭遇效应,导致洪水发生的频率和强度发生变化。为了解西江中游水文要素变异的驱动力和时空变异规律,为多输入单输出水文相关模型(MISOHRM)的建立及非一致性洪水频率计算方法提供基础依据,本文利用1958~2007年西江中游七个水文站两个区间的水文要素序列,采用水文变异诊断系统对各要素进行变异分析。结果显示西江中游干流上的武宣、大湟江口和梧州站的洪峰流量序列关系密切,变异点也较为一致;而支流上的站点间以及站点和区间之间联系程度不紧密。

With the higher and harder levees and no lakes to storage the flood at the middle Xi River, the en-counter and return to main channel of flood were strengthened and the frequency and intensity of flood were changed. Because of the basic function of hydrological elements alteration analysis to the MISOHRM model and inconsistent flood frequency algorithm, with the hydrological series of 7 hydrological stations at the middle Xi River from the year of 1958 to 2007, the hydrological alteration diagnosis system was used to analyze the alteration regulation. The results show that, the relationship of the Wuxuan, Wuzhou and Da-huangjiangkou stations in the main stream is close and consistent, but the relationship between stations and regions in the tributary are not apparent.

 

基于MISOHRM模型的非一致性洪水频率计算方法及应用III:模型构建与非一致性洪水频率计算
Algorithm and Application of Inconsistent Flood Frequency Based on the MISOHRM Model (III): Hydrological Frequency Analysis with Inconsistent Flood Series
 [PDF]

, 谢平, , 许斌
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.16071
Abstract: 西江流域由于上游干、支流和区间洪水遭遇和洪水归槽问题,导致上游量级不大的洪水到了下游则演变成大洪水或特大洪水,给流域防洪工作以及两岸人民生产生活造成了巨大威胁。针对干支流和区间遭遇作用的西江洪水问题,本文利用西江中游7个水文站1958~2007年的年最大洪峰流量序列和两个区间(武江区间和江梧区间)1958~2007年的年最大一日降雨序列,分别建立了西江中游两区间多输入单输出水文相关模型(MISOHRM);从成因的角度探讨了西江中游干流控制站点大湟江口和梧州站洪水的组成和影响因子;并应用该模型对西江梧州站年最大洪峰流量序列进行频率计算,以得到过去、现状和未来条件(三种情景)下年最大洪峰流量序列的频率分布,为防洪规划和洪水灾害风险评估提供设计依据。
Due to both flood returning to main channel and the encounter experience of  main and branch flood and interval flood, the flood could evolve into a deluge or catastrophic flood from a much smaller order of magnitude as it arrives from upstream to downstream, posing a significant threat to the drainage area’ flood control as well as people’s production and living on both sides. For studying the flood under the consideration of encounter experience of main and branch flood and interval flood in West River, the relevant model of multi-input and single-output are developed on the main and branch flood and the interval rainstorm, and using the relevant model to investigate the composition and impact factors of flood in Dahuangjiangkou and Wuzhou station from the perspective of causes. The station of Dahuangjiangkou in the WestRiveras an example, the past and present as well as future frequency distributions of annual flood series were gained, and get flood frequency
基于MISOHRM模型的非一致性洪水频率计算方法及应用IV:西江中游堤防防洪能力影响评价
Algorithm and Application of Inconsistent Flood Frequency Based on the MISOHRM Model (IV): Flood Control Ability Assessment in the Middle of Xijiang River
 [PDF]

许斌, 谢平, ,
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.16073
Abstract: 为了抵御洪水的堤防工程被不断加高,改变了原天然河道的洪水槽蓄关系,促使洪峰流量序列发生变异,使得洪水序列失去了一致性,导致防洪堤的防洪能力一再受到挑战和质疑。本文在梧州站基于MISOHRM模型的非一致性洪水频率计算结果的基础上,对其堤防防洪能力进行了分析。结果显示:梧州站堤防的防洪能力有显著降低的趋势,在安全超高2.0~2.5 m的条件下,其右堤可以抵御的洪水标准从过去条件下的77.13~145.90年一遇,降低到现状条件下的6.20~10.93年一遇和未来条件下的3.33~4.95年一遇。左堤可以抵御的洪水标准从过去条件下的24.53~39.72年一遇,降低到现状条件下的3.13~4.25年一遇和未来条件下的1.85~2.32年一遇。
The levees were built to control the flood, and with the higher and higher flood control standard, the flood series become inconsistent and the hydrological alteration happens in the flood peak series, the flood control ability was under challenge and suspicion, while the research of flood control ability in the changing environment was not too much. With the calculation results of inconsistent flood frequency method based on the MISOHRM model of Wuzhou station, the flood control ability was analyzed. The results show that: the decrease tendency of flood control ability is obviously at Wuzhou station, under the condition of safe super elevation from 2.0mto2.5m, the flood control ability of right levee decreased from 77.13 -145.90 yd (past condition) to 6.20 -10.93 yd (present condition) and
基于MISOHRM模型的非一致性洪水频率计算方法及应用I:原理与方法
Algorithm and Application of Inconsistent Flood Frequency Based on the MISOHRM Model (I): Principles and Algorithm
 [PDF]

谢平, 许斌,,
Journal of Water Resources Research (JWRR) , 2012, DOI: 10.12677/JWRR.2012.14030
Abstract: 西江中游由于缺乏湖泊对洪水的调蓄,加之防洪堤不断地加高加固引起洪水归槽,加强了洪水遭遇效应,导致洪水发生的频率和强度发生变化,其一致性受到影响。多输入单输出水文相关模型(MISOHRM)可以较好地分析某一站点的水文要素受到其上游多个站点因素的影响情况,结合非一致性水文频率计算原理,提出适用于非一致性洪水序列的频率计算方法,该方法将对变化环境下的堤防建设和流域防洪减灾规划制定,具有一定的参考价值。
With the higher and harder levees and no lakes to storage the flood at the middle stream of XijiangRiver, the encounter and return to main channel of flood were strengthened and the frequency and intensity of flood were changed, and the consistency was affected. The Multiple Input Single Output Hydrological Relevant Model (MISOHRM) was used to analyze the affection of multiple affecters upstream to the certain hydrological station downstream, with the principles of inconsistent hydrological frequency calculation, the algorithm of inconsistent flood series frequency calculation was put forward. This algorithm could be useful to the construction of levees and the formulation of flood control planning in the changing environment nowadays.
地震与波浪荷载作用下偏心海洋平台扭转耦联参数影响分析
何晓,
工程力学 , 2009,
Abstract: 质量偏心和刚度偏心是结构偏心的两种重要形式,该文从单层平台结构体系在地震与波浪环境荷载作用下的一般振动方程出发,推导得到了可以考虑平台不同偏心形式的振动方程。在此基础上,针对不同水深的导管架海洋平台典型算例进行了数值计算,分析了三种荷载工况(地震作用、波浪作用、地震波浪耦合作用)时,平台结构的偏心形式、偏心率以及目标分析点的位置对偏心平台扭转耦联响应的影响规律,同时还分析了地震、波浪荷载强度对偏心平台扭转耦联响应的影响规律。分析结果表明:平台结构的偏心形式、目标点位置以及偏心率的大小都会影响偏心平台的扭转耦联响应,同时地震与波浪的联合作用对不同场地上不同周期类型的平台影响不尽相同,在某些情况下有必要考虑地震与波浪的联合作用对海洋平台进行抗震分析。
波浪与地震对小尺度桩柱的共同作用研究
何晓,
地震工程与工程振动 , 2007,
Abstract: 本文以某一实际平台桩柱为例,对其进行波浪作用以及波浪与地震共同作用研究。依据我国海港水文规范JTJ213-98、DNV的环境条件和环境荷载规范以及API的相关规范1-3,对波浪荷载的计算采取不同的简化处理方式,从而分析流体的附加质量效应和流固耦合效应在不同工况下对桩柱结构响应的影响,并分析了该影响随工作水深和波浪参数的变化规律。结果表明,两种工况下流体的附加质量效应和流固耦合效应对桩柱响应的影响趋势并不相同,当进行波浪与地震共同作用分析时,有必要考虑流体附加质量效应和流固耦合效应对结构响应的影响。
偏心形式对偏心结构扭转耦联地震响应的影响
何晓,
世界地震工程 , 2008,
Abstract: 质量偏心和刚度偏心是结构偏心的两种重要形式,从单层无阻尼结构体系地震作用下的一般振动方程出发,推导得到了不同偏心形式的结构考虑地震动扭转分量时的振动方程。在此基础上,编制相应程序对典型算例进行了数值计算,分析了结构的偏心形式、偏心率、侧扭周期比、结构周期、结构尺寸以及地震动扭转分量对偏心结构扭转耦联地震响应的影响规律。分析结果表明结构的偏心形式对结构扭转耦联响应影响较大,不可忽视,同时地震动转动分量对结构平扭耦联响应也存在一定的影响。
基于rs和gis的耕地资源质量评价——以浙江省富阳市为例
姚赫,,
土壤 , 2013,
Abstract: 开展耕地质量调查与评价对更科学地利用有限的耕地资源、提高综合生产能力、遏制耕地质量退化、确保地力等有十分必要的作用。本研究综合运用遥感(rs)和地理信息系统(gis)技术,对研究区landsattm多光谱影像进行了定量分析,最终将富阳耕地质量划分为5个等级。结果表明,一级耕地只占了0.28%,二、三级耕地占了约70%,较差的耕地占了约30%。在此基础上分析了各等级耕地的分布情况并提出了改进建议,探讨了基于rs和gis技术进行耕地质量评价的意义。
马哈利樱桃矮化砧的DNA甲基化水平及模式分析
,
- , 2017,
Abstract: 该研究利用MSAP技术,对25株矮化马哈利樱桃和25株半矮化马哈利樱桃进行甲基化水平和模式分析,以探讨其矮化的表观性状与其基因组甲基化修饰的关系。结果表明:(1)从64对引物中筛选出15对引物,在半矮化组中共扩增4 577个条带,其中半甲基化336个,全甲基化1 274个;在矮化组中共扩增4 444个条带,其中半甲基化349个,全甲基化1 383个;t检验和方差分析表明,矮化组与半矮化组在总甲基化水平和全甲基化水平上差异极显著,在半甲基化水平上差异显著,矮化组甲基化水平高于半矮化组。(2)半矮化组单态性位点23个,多态性位点136个;矮化组单态性位点17个,多态性位点142个,表明矮化组多态性高于半矮化组。(3)多态性类型分析表明,矮化组出现A4类型的频率较半矮化组高,A2类型的频率较半矮化组低,即矮化组中发生超甲基化的位点多于半矮化组,且‘马哈利’基因组甲基化多态性位点主要发生在双链内侧甲基化位点以及超甲基化位点上。研究认为,马哈利樱桃矮化和半矮化的基因组甲基化水平及模式存在差异,马哈利砧木的矮化性状与其基因组甲基化修饰有关。
汶川地震村镇建筑结构震害调查与分析
,刘晓,
大连理工大学学报 , 2009, DOI: 10.7511/dllgxb200905017
Abstract: 汶川地震给四川地区特别是村镇地区造成了灾难性的破坏.介绍了四川村镇地区的主要建筑结构形式,及此次地震村镇建筑的震害特点,并对地震中村镇房屋的常见破坏形式进行了分析,提出了村镇建筑抗震方面的建议.通过本次村镇建筑震害调查分析发现我国村镇建筑结构普遍缺乏必备的抗震构造措施,存在较大隐患,与村镇建筑相适应的实用抗震技术有待进一步系统化、规范化;村镇房屋建设还缺少完善的国家技术规范指导,村镇建筑抗震能力亟待进一步提高.
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