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Using stable isotopes to estimate young water fractions in a heavily regulated, tropical lowland river basin
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-07-28 , DOI: 10.1002/hyp.13878 Anh Duc Trinh 1 , Thu Nga Do 1, 2 , Virginia N. Panizzo 3 , Suzanne McGowan 3 , Melanie J. Leng 4, 5
Hydrological Processes ( IF 2.8 ) Pub Date : 2020-07-28 , DOI: 10.1002/hyp.13878 Anh Duc Trinh 1 , Thu Nga Do 1, 2 , Virginia N. Panizzo 3 , Suzanne McGowan 3 , Melanie J. Leng 4, 5
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The young water fraction of streamflow (Fyw), an important hydrological variable, has been calculated for the first time, for a monsoon‐fed coastal catchment in northern Vietnam. Oxygen stable isotopes (δ18O) from six river sites in the Day River Basin (DRB) were analysed monthly, between January 2015 and December 2018. River δ18O signatures showed sine wave variability, reflecting the amount effect and tropical (dry‐rainy) seasonality of the region. The δ18O composition of precipitation ranged from −12.67 to +1.68‰, with a mean value of −5.14‰, and in‐streamflow signatures ranged from −11.63 to −1.37‰ with a mean of −5.02‰. Fractions of young water (Fyw) were calculated from the unweighted and flow‐weighted δ18O composition of samples. Unweighted Fyw ranged between 29 ± 8% and 82 ± 21% with a mean value of 51 ± 19%, and was not significantly different from flow‐weighted Fyw (range between 33 ± 25% and 92 ± 73%, mean 52 ± 36%). Both unweighted and flow‐weighted Fyw were highest in the middle of stream and lowest in downstream sites, capturing the impacts of landuse changes, hydrology and human activities in the catchment. Our calculations imply that more than a half of rainwater reaches the DRB river mainstream within the first 3 months. The Fyw is much higher than the global average (of one‐third) and insensitive to discharge due to the combination of a humid catchment with high rainfall, low storage capacity, flat landscape and an intensive drainage system in the DRB. Also the low discharge sensitivity of Fyw in the DRB implies that the regional hydrology is severely altered by humans.
中文翻译：
使用稳定的同位素来估计热带低地流域受到严格管制的年轻水份
越南北部季风饲养的沿海流域首次计算了水流的年轻水分量（Fyw），这是一个重要的水文变量。氧稳定同位素（δ 18 O）从日河流域（DRB）的6个河流位点分析了月，2015年1月和2018年十二月间河δ 18个Ø签名显示正弦波的变化，反映了量效和热带（干多雨）该地区的季节性。的δ 18沉淀的O的合成物介于-12.67至+ 1.68‰，具有-5.14平均值‰，和在水流签名介于-11.63至-1.37‰，平均的-5.02‰。幼水的分数（Fyw）从加权计算和流量加权δ 18样品O的合成物。未加权Fyw介于29±8％和82±21％之间，平均值为51±19％，与流量加权Fyw并无显着差异（范围在33±25％和92±73％之间，平均值52±36 ％）。流域中的未加权Fyw和流量加权Fyw最高，而下游的Fyw最低，反映了流域内土地利用变化，水文学和人类活动的影响。我们的计算表明，在头三个月内，超过一半的雨水进入了DRB河的主流。该FYW远高于全球平均水平（三分之一），并且由于DRB中集水量高，降雨多，储水量低，地势平坦以及集水系统密集等原因，对排放不敏感。此外，DRB中Fyw的放电敏感性低，这意味着人类严重改变了区域水文学。
更新日期：2020-10-06
中文翻译：
使用稳定的同位素来估计热带低地流域受到严格管制的年轻水份
越南北部季风饲养的沿海流域首次计算了水流的年轻水分量（Fyw），这是一个重要的水文变量。氧稳定同位素（δ 18 O）从日河流域（DRB）的6个河流位点分析了月，2015年1月和2018年十二月间河δ 18个Ø签名显示正弦波的变化，反映了量效和热带（干多雨）该地区的季节性。的δ 18沉淀的O的合成物介于-12.67至+ 1.68‰，具有-5.14平均值‰，和在水流签名介于-11.63至-1.37‰，平均的-5.02‰。幼水的分数（Fyw）从加权计算和流量加权δ 18样品O的合成物。未加权Fyw介于29±8％和82±21％之间，平均值为51±19％，与流量加权Fyw并无显着差异（范围在33±25％和92±73％之间，平均值52±36 ％）。流域中的未加权Fyw和流量加权Fyw最高，而下游的Fyw最低，反映了流域内土地利用变化，水文学和人类活动的影响。我们的计算表明，在头三个月内，超过一半的雨水进入了DRB河的主流。该FYW远高于全球平均水平（三分之一），并且由于DRB中集水量高，降雨多，储水量低，地势平坦以及集水系统密集等原因，对排放不敏感。此外，DRB中Fyw的放电敏感性低，这意味着人类严重改变了区域水文学。
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