摘要
山溪性中小河流在全球沉积物由陆入海过程中扮演着重要角色,过去研究主要关注于河流入海物质通量估算及河口区环境评价,而对其相关的水循环研究较少。以浙闽沿海地区代表性中小河流(如椒江和木兰溪等)不同季节河水δD和δ^(18)O组成为研究基础,结合中国东部季风区降水及河流水文资料,旨在探讨浙闽典型中小河流氢氧同位素组成的时空变化特征及控制因素。研究发现,不同季节河流氢氧同位素组成变化显著,夏季河水主要补给来源为降水,冬季则主要受地下水的调节。空间上,干流河水夏季δ^(18)O沿程变化不大,冬季受沿程蒸发作用的影响,呈现由上游向下游逐渐偏正的趋势;受降雨量效应及地下水纬度效应的综合控制,冬季河水δ^(18)O随纬度升高明显偏负。河口区冬季样品δ^(18)O与盐度具有很好的相关性,结合我国东部其他河口数据,为研究我国东部海域周边沿岸流时空变化提供了新的参考手段。
Small mountainous rivers play an important role in the global sediment budget between the land and the sea.Previous studies mostly focus on sediment flux to the oceans in addition to estuarine environment,but rare on the related water cycle.The seasonal compositions of δD and δ^（18）O of river water from small rivers（such as Jiaojiang and Mulanxi rivers）and their estuaries in Zhejiang and Fujian provinces are investigated in this study.Combined with the precipitation and river hydrological data,we discussed the temporal and spatial variations in δD and δ^（18）O of river water and their influence factors.It is found that the δ^（18）O of river water are very different depending upon water sources.In the study areas,river water is mainly sourced from precipitation in summer and from groundwater in winter.Spatially,the δ^（18）O of mainstream water in this area is relatively constant in summer while increases from the inland to the estuary in winter due to the evaporation effect.Under the effects of precipitation and the latitude effect on groundwater,the δ^（18）O of river water decreases from south to north in winter.In the estuary area,however,theδ^（18）O values correlated well with the salinity.Together with the data from other estuaries in eastern China,this paper offers a new reference for further study of the spatial and temporal variation of coastal current in the east coast of China.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2018年第1期160-169,共10页
Marine Geology & Quaternary Geology
基金
国家海洋局第三海洋研究所专项资金(海三科2016034)
国家自然科学基金"我国东部典型河流及边缘海沉积物的‘从源到汇’时间尺度探究"(41676035)
"全球变化与海气相互作用"专项(GASI-GEOGE-03)
上海市优秀学科带头人计划(14XD1403600)
科技部"典型中小入海河流河口动力沉积地貌与环境本底数据调查"项目(2013FY112200)
关键词
河水
氢氧同位素
时空变化
示踪
浙闽中小河流
river water
stable hydrogen and oxygen isotopes
the temporal and spatial variation
tracer
small rivers in Zhe-jiang and Fujian Provinces
