Estimation of residence time of lake water and material circulation on the basis of seasonal variation of river water flowing into the lake

基于入湖河水季节变化估算湖水停留时间和物质循环

基本信息

  • 批准号:
    13640436
  • 负责人:
  • 金额:
    $ 1.54万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2002
  • 项目状态:
    已结题

项目摘要

Seasonal variation of dissolved and suspended material coming into Lake Biwa through main 12 rivers are studied by the successive hydrological and chemical observations. On the basis of these observed data, water quality formation and residence time of lake water are analyzed by the numerical model.River water is characterized by the geological background and land use, and shows a large amplitude of seasonal variation in its water quality. We have an attention on some event such as waste water from paddy field, heavy rainfall, and water level depletion in summer. We also made a successive observation of water quality along the River Yasu, which has a maximum catchment area among river in Lake Biwa basin.After heavy rainfall, electric conductivity is rapidly increased by "washout effect", but is soon decreased by dilution. In this case, river water is flowing into the thermocline depth of the lake because of its lower water temperature than usual.Highly turbid water containing high concentration of phosphorus and nitrogen, which is originated from paddy fields just before rice-planting, flows into the lake. This phenomenon has very bad influence on the lake water quality.Residence time of lake water is estimated by numerical model using chloride concentration as a tracer : As a result, residence time of lake water is calculated little longer than that estimated former because river water flows into the surface layer and goes out fro the lake in spring time. Concentration of chloride also is calculated to be increased about 1 mg/L one year later if the qualities of river water are not improved.
连续的水文和化学观察研究研究了通过主要12河进入BIWA湖的季节性变化。根据这些观察到的数据,通过数值模型分析了水质的形成和湖水的停留时间。河流水的特征是地质背景和土地利用,并显示出其水质季节性变化很大。我们对某些事件有关注,例如夏季的降雨量,大雨和水位耗尽。我们还连续观察了Yasu河的水质,该河中的Biwa盆地河之间的流域最大。大雨后,通过“冲洗效应”迅速增加了电导率,但很快会因稀释而降低。在这种情况下,河水由于其水温低于平常而流入湖泊的热跃层深度。含有高浓度的磷和氮气的高浊水源于植入水稻之前的稻田,流入湖中。这种现象对湖水质量的影响非常严重。湖水的居住时间是通过使用氯化物浓度作为示踪剂的数值模型来估计的:结果,湖水的停留时间比估计的以前的时间更长,因为河水流入地面层,并在春季的湖中出来。如果没有提高河水的质量,则还计算出氯化物的浓度在一年后增加约1 mg/l。

项目成果

期刊论文数量(0)
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ENDOH Shuichi其他文献

カンボジア・シェムリアプ川流域における陸水の水質特性
柬埔寨暹粒河流域内陆水体水质特征
  • DOI:
  • 发表时间:
    2014
  • 期刊:
  • 影响因子:
    0
  • 作者:
    OYAGI Hideo;ENDOH Shuichi;et al;大八木英夫・Hang Peou・塚脇真二
  • 通讯作者:
    大八木英夫・Hang Peou・塚脇真二
カンボジア・シェムリアプ川リュ域における陸水の水質特性
柬埔寨暹粒河Ryu地区陆地水水质特征
  • DOI:
  • 发表时间:
    2014
  • 期刊:
  • 影响因子:
    0
  • 作者:
    OYAGI Hideo;ENDOH Shuichi;et al;大八木英夫・Hang Peou・塚脇真二;大八木英夫・Hang Peou・塚脇真二
  • 通讯作者:
    大八木英夫・Hang Peou・塚脇真二
The distribution of nutrient substance and dissolved oxygen around the inundated forest in Lake Tonle Sap
洞里萨湖淹没森林周围营养物质和溶解氧的分布
  • DOI:
  • 发表时间:
    2014
  • 期刊:
  • 影响因子:
    0
  • 作者:
    OYAGI Hideo;ENDOH Shuichi;ISHIKAWA Toshiyuki;Yasuaki OKUMURA and TSUKAWAKI Shinji;Hideo OYAGI et al
  • 通讯作者:
    Hideo OYAGI et al

ENDOH Shuichi的其他文献

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{{ truncateString('ENDOH Shuichi', 18)}}的其他基金

Evaluation of material circulation in lakes by continuous tracking of river water
通过河水连续跟踪评价湖泊物质循环
  • 批准号:
    16540397
  • 财政年份:
    2004
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Behavior and relationship of land and lake originated suspended substance in a lake
湖泊中源自陆地和湖泊的悬浮物质的行为和关系
  • 批准号:
    10640422
  • 财政年份:
    1998
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Behavion and Interaction of Suspended Substance in the thermocline and benthic layr of the lake.
湖泊温跃层和底栖层悬浮物质的行为和相互作用。
  • 批准号:
    08640546
  • 财政年份:
    1996
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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