检索结果相关分组
- 鄱阳湖实体动床模型设计
- 作者： 黄志文 邬年华 许新发 来源：江西水利科技 年份：2015 文献类型 ：期刊 关键词： 动床设计 实体模型 鄱阳湖 轻质塑料沙
- 描述：模型沙选择是动床模型设计的关键因素.鄱阳湖模型变率大、入湖泥沙细,动床模型宜选用轻质模型沙.本文采用泥沙运动相似条件的研究成果,进行模型沙粒径比尺的初步设计,结合水槽起动流速试验,选取适合的模型沙
- 全文：模型沙选择是动床模型设计的关键因素.鄱阳湖模型变率大、入湖泥沙细,动床模型宜选用轻质模型沙.本文采用泥沙运动相似条件的研究成果,进行模型沙粒径比尺的初步设计,结合水槽起动流速试验,选取适合的模型沙
- 鄱阳湖水利枢纽调度对湖区枯期水位与流速影响
- 作者： 余启辉 马强 游中琼 来源：人民长江 年份：2013 文献类型 ：期刊 关键词： 流速 水位 枯水期 调度方式 鄱阳湖水利枢纽
- 描述：通过充分考虑鄱阳湖与长江之间的相互作用、湖区区间汇流对水动力的作用以及湖区复杂的河湖交替形态,采用江湖连通一、二维耦合水文-水动力模型,研究了鄱阳湖水利枢纽调度对湖区枯期水位与流速的影响。结果表明
- 全文：通过充分考虑鄱阳湖与长江之间的相互作用、湖区区间汇流对水动力的作用以及湖区复杂的河湖交替形态,采用江湖连通一、二维耦合水文-水动力模型,研究了鄱阳湖水利枢纽调度对湖区枯期水位与流速的影响。结果表明
- 鄱阳湖模型选沙试验研究
- 作者： 荣晓刚 来源：南昌大学 年份：2011 文献类型 ：学位论文 关键词： 模型沙 塑料沙 粒径比尺 起动流速
- 描述：,通过这些设计方法可以基本确定出来符合相似要求的泥沙粒径比尺。运行文中的提出的模型沙粒径比尺的设计方法,初步确定选用泥沙的泥沙粒径比尺,最后通过水槽试验进行了塑料沙的起动流速试验,以d50分别为0.063
- 全文：,通过这些设计方法可以基本确定出来符合相似要求的泥沙粒径比尺。运行文中的提出的模型沙粒径比尺的设计方法,初步确定选用泥沙的泥沙粒径比尺,最后通过水槽试验进行了塑料沙的起动流速试验,以d50分别为0.063
- 鄱阳湖模型选沙试验研究
- 作者： 荣晓刚 来源：南昌大学 年份：2011 文献类型 ：学位论文 关键词： 模型沙 塑料沙 粒径比尺 起动流速
- 描述：,通过这些设计方法可以基本确定出来符合相似要求的泥沙粒径比尺。运行文中的提出的模型沙粒径比尺的设计方法,初步确定选用泥沙的泥沙粒径比尺,最后通过水槽试验进行了塑料沙的起动流速试验,以d50分别为0.063
- 全文：,通过这些设计方法可以基本确定出来符合相似要求的泥沙粒径比尺。运行文中的提出的模型沙粒径比尺的设计方法,初步确定选用泥沙的泥沙粒径比尺,最后通过水槽试验进行了塑料沙的起动流速试验,以d50分别为0.063
- 鄱阳湖模型选沙试验研究
- 作者： 荣晓刚 来源：南昌大学 年份：2011 文献类型 ：学位论文 关键词： 模型沙 塑料沙 粒径比尺 起动流速
- 描述：,通过这些设计方法可以基本确定出来符合相似要求的泥沙粒径比尺。运行文中的提出的模型沙粒径比尺的设计方法,初步确定选用泥沙的泥沙粒径比尺,最后通过水槽试验进行了塑料沙的起动流速试验,以d50分别为0.063
- 全文：,通过这些设计方法可以基本确定出来符合相似要求的泥沙粒径比尺。运行文中的提出的模型沙粒径比尺的设计方法,初步确定选用泥沙的泥沙粒径比尺,最后通过水槽试验进行了塑料沙的起动流速试验,以d50分别为0.063
- 鄱阳湖湖流特征
- 作者： 王婧 曹卫芳 司武卫 郭章亮 来源：南昌工程学院学报 年份：2015 文献类型 ：期刊 关键词： 湖流 鄱阳湖 分布特征
- 描述：基于2010—2014年湖流监测资料,分析了鄱阳湖湖流分布特征。结果表明:(1)鄱阳湖北部湖区流速最大,其次为主湖区、入江水道区,东部湖区最小;主槽流速大于洲滩和湖湾;枯水期流速大于平水期和丰水期
- 全文：基于2010—2014年湖流监测资料,分析了鄱阳湖湖流分布特征。结果表明:(1)鄱阳湖北部湖区流速最大,其次为主湖区、入江水道区,东部湖区最小;主槽流速大于洲滩和湖湾;枯水期流速大于平水期和丰水期
- 模拟研究变化水位和流速条件下鄱阳湖磷释放特征
- 作者： 童亚莉 梁涛 王凌青 李可欣 来源：Journal of Geographical Sciences 年份：2017 文献类型 ：期刊
- 描述：Since the construction of the Three Gorges Dam,the Poyang Lake hydrological characteristics obviously changed.During the impoundment period of the Three Gorges Reservoir,the hydrodynamic factors of Poyang Lake varied.Water level dropped,the velocity decreased and water exchange time lengthened,which changed the release of phosphorous from sediments.In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments,we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities.We found that both water level rising and velocity increasing could enhance the disturbance intensity to sediments,which caused the increase of suspended solids(SS)concentration,total phosphorus(TP)concentration in the overlying water,and the ability that phosphorus released to overlying water from sediments enhanced as well:when overlying water velocity maintained 0.3 m/s,SS concentration increased to 4035.85 mg/L at the water level25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2times that of the value at 10 cm;when water level maintained 15 cm,SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s,and TP concentration in the overlying water increased from 0.11 mg/L to 0.44mg/L.When the water level maintained 15 cm,the phosphorous release rate reached the maximum value of 4.86 mg/(md)at 0.4 m/s.The concentration of total dissolved phosphorous(TDP)and soluble reactive phosphate(SRP)both in overlying water and sediment-water interface were negatively correlated with p H.Using the parabolic equation,the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm,and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.
- 全文：Since the construction of the Three Gorges Dam,the Poyang Lake hydrological characteristics obviously changed.During the impoundment period of the Three Gorges Reservoir,the hydrodynamic factors of Poyang Lake varied.Water level dropped,the velocity decreased and water exchange time lengthened,which changed the release of phosphorous from sediments.In order to investigate how the hydrodynamic factors influence the release of phosphorous from sediments,we used a two-way annular flume device to simulate the release characteristics of phosphorous from sediments under variable water levels and velocities.We found that both water level rising and velocity increasing could enhance the disturbance intensity to sediments,which caused the increase of suspended solids(SS)concentration,total phosphorus(TP)concentration in the overlying water,and the ability that phosphorus released to overlying water from sediments enhanced as well:when overlying water velocity maintained 0.3 m/s,SS concentration increased to 4035.85 mg/L at the water level25 cm which was about 25 times compared to the minimum value and TP concentration in the overlying water also reached the maximum value at the water level 25 cm which was 1.2times that of the value at 10 cm;when water level maintained 15 cm,SS concentration increased to 4363.35 mg/L at the velocity of 0.5 m/s which was about 28 times compared to the value of 0 m/s,and TP concentration in the overlying water increased from 0.11 mg/L to 0.44mg/L.When the water level maintained 15 cm,the phosphorous release rate reached the maximum value of 4.86 mg/(md)at 0.4 m/s.The concentration of total dissolved phosphorous(TDP)and soluble reactive phosphate(SRP)both in overlying water and sediment-water interface were negatively correlated with p H.Using the parabolic equation,the optimum water level at a velocity of 0.3 m/s was calculated to be 0.57 cm,and the optimum velocity at water level of 15 cm was found to be 0.2 m/s.
- 鄱阳湖湖流特性分析与研究
- 作者： 熊道光 来源：海洋与湖沼 年份：1991 文献类型 ：期刊 关键词： 分析 湖流 鄱阳湖 湖泊
- 描述：。面上分布不均衡,湖流大小的顺序是湖口水道、五河入湖区、主湖区、湖湾区。垂直分布,顺畅型接近对数曲线,倒灌型和顶托型复杂多变。低水河相,流速大,流向规则稳定;高水湖相,流速小,流向紊乱多变。风生流对吞吐流的影响有显著的风向效应和水位高低、湖面宽窄的差异。
- 全文：。面上分布不均衡,湖流大小的顺序是湖口水道、五河入湖区、主湖区、湖湾区。垂直分布,顺畅型接近对数曲线,倒灌型和顶托型复杂多变。低水河相,流速大,流向规则稳定;高水湖相,流速小,流向紊乱多变。风生流对吞吐流的影响有显著的风向效应和水位高低、湖面宽窄的差异。