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- 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.
- 高密度电阻率法在鄱阳湖圩堤防汛抢险中的应用
- 作者： 万怡国 高江林 邹晨阳 来源：人民长江 年份：2017 文献类型 ：期刊 关键词： 隐患探测 防汛抢险 高密度电阻率法 鄱阳湖区圩堤
- 描述：鄱阳湖区圩堤由于堤身环境、质量及区域地质条件等原因,易发生堤身渗漏和堤基管涌等险情,汛期高水位时,此类险情直接威胁圩堤安全。针对湖区西河东联圩堤身渗漏传统处置方法效果不佳的问题,采用高密度电阻率法
- 全文：鄱阳湖区圩堤由于堤身环境、质量及区域地质条件等原因,易发生堤身渗漏和堤基管涌等险情,汛期高水位时,此类险情直接威胁圩堤安全。针对湖区西河东联圩堤身渗漏传统处置方法效果不佳的问题,采用高密度电阻率法
- 鄱阳湖流域江湖关系研究综述
- 作者： 杨沛钧 廖智凌 来源：中国农村水利水电 年份：2017 文献类型 ：期刊 关键词： 长江 江湖关系 鄱阳湖
- 描述：围绕鄱阳湖近年频繁出现的极端枯水位问题,从鄱阳湖、长江以及五河(抚、信、修、赣、饶)三者的江湖关系这方面介绍了近年来开展的具有代表性的研究方法及其成果,总结了当今鄱阳湖流域江湖关系的研究热点问题以及
- 全文：围绕鄱阳湖近年频繁出现的极端枯水位问题,从鄱阳湖、长江以及五河(抚、信、修、赣、饶)三者的江湖关系这方面介绍了近年来开展的具有代表性的研究方法及其成果,总结了当今鄱阳湖流域江湖关系的研究热点问题以及
- “江湖”大战 鄱阳湖水利枢纽工程博弈36 年
- 作者： 欧维 赵伟 方明 徐典波 来源：环球人文地理 年份：2017 文献类型 ：期刊 关键词： 水位降低 博弈 长江中下游 长江流域 鄱阳湖 江湖 水利枢纽工程 生态地位
- 描述：鄱阳湖是中国最大的淡水湖,因其特殊的生态地位,被人们称为长江流域的“绿肺”,有学者甚至直言,鄱阳湖一旦病变,长江中下游就会“半身不遂”。近年来,鄱阳湖连续出现枯水期水位降低、枯水期提前等“病况
- 全文：鄱阳湖是中国最大的淡水湖,因其特殊的生态地位,被人们称为长江流域的“绿肺”,有学者甚至直言,鄱阳湖一旦病变,长江中下游就会“半身不遂”。近年来,鄱阳湖连续出现枯水期水位降低、枯水期提前等“病况
- 鄱阳湖典型洲滩湿地水分补排关系
- 作者： 林欢 许秀丽 张奇 来源：湖泊科学 年份：2017 文献类型 ：期刊 关键词： 鄱阳湖湿地 水分补排过程 根系层 HYDRUS模型 GSPAC系统 土壤水
- 描述：有限的监测手段,部分界面水分通量连续动态变化数据的获取及定量化工作较为困难,目前应用数值模拟法于湿地水分运移研究的案例仍不多见.本文以鄱阳湖典型湿地为研究区,构建垂向一维数值模型,阐释了湖泊水位显著
- 全文：有限的监测手段,部分界面水分通量连续动态变化数据的获取及定量化工作较为困难,目前应用数值模拟法于湿地水分运移研究的案例仍不多见.本文以鄱阳湖典型湿地为研究区,构建垂向一维数值模型,阐释了湖泊水位显著