维普中文期刊产品整合服务
48篇 您的检索式:作者名="Kumud"
    题名 作者 年代 出处 被引量
1大型浅水湖泊水动力模型不确定性和敏感性分析显示文摘选取国内外常用的水动力学模型(EFDC)和典型的浅水湖泊(太湖),采用拉丁超立方取样(LHS),研究湖泊水动力模块中常用的5个重要参数(风拖曳系数、床面粗糙高度、涡粘性系数、紊流扩散系数以及风遮挡系数)对湖体水位和流速的影响。结果表明:针对大型浅水湖泊,湖泊岸线形状和湖底地形、湖泊周围地形、湖泊水面风场对模拟结果产生决定性影响。尤其是在湖湾区和周边地形比较复杂的地区,风场参数对水动力模拟结果不确定性的贡献率最大。在垂向上,表层流速受到参数不确定性的影响最大,底层次之,中层最小。床面粗糙高度对水动力模拟结果不确定性贡献率较风场参数要小,水体涡粘滞系数和扩散系数影响则更小。故在选择大型浅水湖泊水动力模型参数时,要充分考虑湖泊岸线和周围地形,着重率定风场参数以及床面粗糙高度。李一平 唐春燕 余钟波 Acharya Kumud 2012水科学进展2012,23,2:44
2引江济太调水工程对太湖水动力的调控效果显示文摘为研究引江济太调水工程对太湖水动力调控所产生的效果,采用数学模型对其水动力进行模拟.利用环境流体动力学模型(EFDC模型),以湖体水龄(描述湖泊水体交换速率的参数)为研究对象,系统地研究引江济太调水工程对太湖水动力的调控情况.结果表明:(a)引江济太调水工程对太湖湖体水动力过程的作用效果很大程度上取决于风速、风向以及出入湖的流量;(b)太湖湖体水龄的分布具有很强的时空异质性,夏天的平均水龄约为130d,其他季节的平均水龄约为230d;(c)太湖地区夏天的主导风向——东南风能够促进东部湖区(无锡、苏州水源地所在地)和梅梁湾湖区(太湖重污染区)的水交换,改善水体运动条件;(d)望虞河入湖的最经济调水流量为100m3/s.郝文彬 唐春燕 滑磊 ACHARYA Kumud 2012河海大学学报(自然科学版)2012,40,2:34
3湖泊水动力模型外部输入条件不确定性和敏感性分析显示文摘以我国典型的大型浅水湖泊太湖为研究区域,采用国内外常用的环境流体动力学模型(EFDC),结合拉丁超立方取样(LHS)方法,研究湖泊水动力模型中4个重要的外部输入条件,即3个边界输入条件(出入湖流量、风速、风向)和1个初始输入条件(初始水位),对模型水动力模拟结果(水位、水龄以及流场)的影响与贡献.结果表明,初始水位的设定对模拟全湖水位和水龄产生决定性影响,不确定性的贡献率分别达到85.73%.和1166.125%,对垂向平均流速影响的贡献率只有3%;风速对表面流速模拟结果影响较大,贡献率达到58.70%,而对水位和水龄的贡献率分别为5.25%和3.00%.在垂向上,各层流速受外部输入条件不确定性的影响规律相似,贡献率排序为风速(55%-60%)〉风向(10%-15%)〉初始水位≈出入湖流量(1%~5%).因此在模拟大型浅水湖泊水动力过程时,可以根据不同的输出目标能够有针对性地提高外部输入条件的准确度,为提高模型精确度提供有效信息.李一平 邱利 唐春燕 布旻晟 田威 余钟波 Kumud Acharya 2014中国环境科学2014,34,2:30
4多目标优化下平原河网引调水改善水环境效果评估显示文摘引调水是改善平原河网地区水环境的重要方法之一,通过构建太湖流域走马塘东南片平原河网区一维水动力水质数学模型,研究不同引调水方案对区域水环境改善效果,确定引调水过程中的异质性因子.从决策目标、水质指标、空间指标3个层面综合考虑,构建环境效益与经济效益结合的多目标函数及评价体系,对引调水方案进行评估优选.结果表明:引调水流量较大时,能够在一定程度上改善区域水环境状况,规划方案下引调水5 d后,高锰酸盐指数、氨氮、总磷的平均改善率分别为30.7%、22.2%、26.4%;引调水时,区域河网中不同空间点位、不同水质指标之间的水质改善过程与效果都存在一定异质性;引调水水量、调度模式及污染源分布都会对调水后的河网区水质产生差异性影响;本研究建立的多目标评价体系较现有方法能够有效涵盖引调水中存在的异质性因子,从多个目标层面优选引调水方案,实现水量水质综合优化调控,为平原河网地区水环境长效管理与科学决策提供理论参考.潘泓哲 李一平 唐春燕 Kumud Acharya 姚向阳 张剑 朱雅 程一鑫 程月 于珊 岳桢铻 2021湖泊科学2021,33,4:17
5农村居民点小型污水处理方式研究显示文摘在对南京市农村居民点污水处理模式分析的基础上,提出适合南京市农村居民点的小型污水处理方式。针对这些小型污水处理方式,进行组合优化研究和应用研究,结合南京市农村地区的实际情况,提出小型污水处理方式的选择原则。田娜 谈永锋 李一平 Acharya Kumud 2013中国农村水利水电2013,,2:6
6Impact of mining on tree diversity of the silica mining forest area at Shankargarh, Allahabad, India显示文摘The Shankargarh forest area is rich in silica, a major mineral used in glass industry. Extensive open cast silica mining has severely damaged the forest as well as productivity of the region. An understand- ing of the impact of mining on the environment particularly on vegeta- tion characteristics is a prerequisite for further management of these mining sites, especially in the selection of species for reclamation works. The present paper deals with the study of the tree composition of silica mining area of Shgankargarh forest, at both disturbed and undisturbed sites. Tree vegetation study was conducted at undisturbed and disturbed sites of Shankargarh forests using standard quadrate method. Density, abundance and frequency values of tree species were calculated. Species were categorized into different classes according to their frequency. The importance value index (IVI) for each species was determined. Species diversity, Concentration of dominance, Species richness and Evenness index were calculated for the undisturbed and disturbed sites. The distri- bution pattern of the species was studied by using Whitford's index. Similarity index between tree composition of disturbed and undisturbed sites was determined by using Jaccard's and Sorenson's index of similar- ity. Tree species showed a drastic reduction in their numbers in disturbed sites compared to that of the undisturbed sites. The phytosociological indices also illustrated the impact of mining on the tree composition of the area. The present study led to the conclusion that resultant tree vege- tation analysis can be used as important tool for predicting the suitability of particular species for revegetating the mined areas.Kumud Dubey K. P. Dubey 2011Journal of Forestry Research2011,22,4:4
7Wind-induced hydrodynamic changes impact on sediment resuspension for large, shallow Lake Taihu, China显示文摘The internal sediment release is a key factor controlling eutrophication processes in large,shallow lakes.Sediment resuspension is associated with the wave and current induced shear stress in large,shallow lakes.The current study investigated the wind field impacts on sediment resuspension from the bottom at Meiliang Bay of large,shallow Lake Taihu.The impacts of the wind field on the wave,current,and wave-current combined shear stresses were calculated.The critical wind speed range was 4–6 m/s after which wave and current shear stress started to increase abruptly,and onshore wind directions were found to be mainly responsible for greater shear stress at the bottom of Lake Taihu.A second order polynomial fitting correlation was found between wave(R^2 0.4756)and current(R^2 0.4466)shear stresses with wind speed.Wave shear stress accounted for 92.5% of the total shear stress at Meiliang Bay.The critical wave shear stress and critical total shear stress were 0.13 N/m^2 for sediment resuspension whereas the current shear stress was 0.019 N/m^2 after which suspended sediment concentrations(SSC)increased abruptly.A second order polynomial fitting correlation was found between wave(R^2 0.739),current(R^2 0.6264),and total shear stress(R^2 0.7394)with SSC concentrations at Meiliang Bay of Lake Taihu.The sediment resuspension rate was 120 to 738 g/m^2/d during 4–6 m/s onshore winds while offshore winds contributed ≥ 200 g/m^2/d.The study results reveal the driving mechanism for understanding the role of the wind field in sediment resuspension while considering wind speed and direction as control parameters to define wave and current shear stresses.Abdul Jalil Yiping Li Ke Zhang Xiaomeng Gao Wencai Wang Hafiz Osama Sarwar Khan Baozhu Pan Salar Ali Kumud Acharya 2019International Journal of Sediment Research2019,34,3:4
8基于生物-光学模型的浅水湖泊水体透明度模拟研究显示文摘水体透明度能够直观反映湖泊水下光场的分布情况,是沉水植物生态恢复的基础条件。以2005年太湖常规采样点实测资料为基础,研究了浅水湖泊水体固有光学特性与水体成分浓度之间的生物光学模型,分析了透明度与光束衰减系数、漫射衰减系数、人眼分辨力之间的关系模型;以生物光学模型为基础,将基于水体成分浓度的透明度反演模型与湖泊三维水动力模型、水质模型和沉积物传输模型相耦合,构建了浅水湖泊水体透明度模型。将该模型与现有的多元回归模型对比,分析了对透明度模拟的精度状况。利用该模型,模拟了不同水动力时水体透明度分布,对太湖生态恢复潜力进行分析,得出了不同水动力条件下太湖典型沉水植物可能恢复的区域,为浅水湖泊生态恢复提供了依据。李一平 滑磊 谈永锋 郝文彬 唐春燕 Kumud Acharya 狄成斌 2013水力发电学报2013,32,6:2
9Preliminary phytochemical screening and physico-chemical parameters of aerial parts of Artemisia Vulgaris 显示文摘Kumar AP Kumud U 2010lnt J Res Pharm2010,1,:1
10Antidiabetic effects of S-methyl cysteine sulphoxlde on alloxan diabetes显示文摘Kumud K Augusti K L 1995Planta Med1995,61,:1
11Antidiabetic effects of onion and garlic sulfoxide amino acids in rats显示文摘Sheela C G Kumud K Augusti K T 1995Planta Med1995,61,4:1
12Carbon disulphide induced impairments in male reproductive system in rats显示文摘PATEL K G KUMUD G GAUTAM A 1999Indian J Phys Allied Sci1999,53,1:1
13Terahertz planar antennas for future wireless communication: A technical review显示文摘Kumud Ranjan Jha G Singh 2013Infrared Physics & Technology2013,60,:1
14Microstrip patch array an- tenna on photonic crystal substrate at terahertz frequency 显示文摘Kumud Ranjan Jha G Singh 2012Infrared Physics & Technology2012,55,:1
15An extended macroscopic model for traffic flow显示文摘Kumud K Sanwal Karl P 1996Transportation Research Part B1996,30,1:1
16Antidliabetic and hypolipidemic effect of Smethyl cysteine Sulfoxide isolated from Allium cepa Linn显示文摘Kumud K Mathew B J 1995India Journal of Biochemistry & Biophysics1995,32,49:1
17Antidliabetic and Hypolipidemic Effect of Smethyl Cysteine Sulfoxide isolated from Allium Cepa Linn 显示文摘Kumud K Mathew B J 1995India Journal of Biochemistry & Biophysics1995,32,:1
18Anfidiabetic and hypolipidemic effect of Smethyl cysteine Sulfoxide isohted from Allium cepa Linn显示文摘Kumud K Mathew B J 1995India Journal of Biochamistry & Biophysics1995,32,:1
19Antidiabetic effects of S-methyl cysteine sulphoxide on alloxan diabetes显示文摘Kumud K Augusti K L 1995Planta Med1995,61,:1
20Modeling impacts of Yangtze River water transfer on water ages in Lake Taihu, China显示文摘Yiping Li Kumud Acharya Zhongbo Yu 2010Ecological Engineering2010,,2:1
返回顶部 每页显示:
共3页 首页 上一页 第1页 下一页 末页 /3 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费