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首页> 外文会议>Flood Forecasting and Water Resources Assessment for IAHS(International Association of Hydrological Sciences)-PUB >Temporal and Spatial Variations of δ~(18)O along the Main Stem of the Yangtze River, China: Based on the 1st isotopic water campaign (2003) and 1 - yr regular monitoring at 4 - station
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Temporal and Spatial Variations of δ~(18)O along the Main Stem of the Yangtze River, China: Based on the 1st isotopic water campaign (2003) and 1 - yr regular monitoring at 4 - station

机译：长江干流沿岸δ〜（18）O的时空变化：基于2003年第一次同位素水运动和4站1年定期监测

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Yangtze River is the largest river in China, and the third longest around the world. The isotope compositions of δD and δ~(18)O in river water are very useful tools for interpreting hydro-logical processes and hydrological cycle related to climate changes and anthropic activities in large-scale river basin. Since 2003, 170 water samples recovered from the 1st water campaign and 1-year regular sampling at 4-station are analyzed forδD and δ~(18)O composition. From upstream to downstream, isotopic compositionsδD and δ~(18)O are gradually increased. The trend line of the first campaign is just situated in the medium of LMWL and the trend line of 1-year river water sampled at 4 regular stations. The relationship of isotopicδD and δ~(18)O at the 4-station is in good accordance with the LMWL. New water body from the tributaries coming to the main stem of Yangtze River is one of the main reasons of spatial isotopic variations in river waters. The results revealed that temporal and spatial variations in the oxygen- and hydrogen-isotope of water samples along the main stem of the Yangtze River strongly relies on the isotope pattern of the regional precipitation. Furthermore, signatures derived from influx of evaporatively enriched waters through the several reservoirs or lakes along the system will be resulted in d-excess values increasing. From the beginning to the end of the low water standing period, isotopic compositions (δD and δ~(18)O) are expressed as progressively increasing. The peak of the river water isotopic temporal variations is good corresponding to the boundary point of the beginning or ending for annual flooding period at site. The peak and valley of the river water temporal isotopic variations is a good indicator to split flooding period or low water standing period at a given location for a water year.
机译：长江是中国最大的河流，也是世界第三大河流。河流水中的δD和δ〜（18）O同位素组成对于解释与大规模流域气候变化和人类活动有关的水文过程和水文循环是非常有用的工具。自2003年以来，对第一次水运动和4个站的1年常规采样中回收的170个水样进行了δD和δ〜（18）O组成分析。从上游到下游，同位素组成δD和δ〜（18）O逐渐增加。第一个活动的趋势线位于LMWL的中间，而4个常规站点的1年河水趋势线则位于该位置。 4站同位素δD与δ〜（18）O的关系与LMWL吻合良好。从支流到长江干流的新水体是河水空间同位素变化的主要原因之一。结果表明，沿长江干流水样的氧同位素和氢同位素的时空变化强烈依赖于区域降水的同位素模式。此外，来自蒸发富集水通过沿系统的几个水库或湖泊涌入而产生的特征将导致d过量值增加。从低水位停留期的开始到结束，同位素组成（δD和δ〜（18）O）逐渐增加。河流水同位素时空变化的峰值与现场年度洪水的开始或结束的边界点相对应。河流水时空同位素变化的高峰和低谷是很好的指示，可以将一个水年的给定位置划分为洪水期或枯水期。

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