| 集水区降雨径流晌应的环境同位素实验研究 |
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| 引用本文： | 顾慰祖.集水区降雨径流晌应的环境同位素实验研究[J].水科学进展,1992,3(4):246-254. |
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| 作者姓名： | 顾慰祖 |
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| 作者单位： | 水利部南京水文水资源研究所 南京 210024 |
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| 基金项目： | 1986年水利部水利科学基金 |
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| 摘 要： | 利用环境同位素氚和氧-18对实验集水区进行降雨和径流响应的研究表明:(1)地面径流必源于本次降雨的概念不确,其中往往有非本次降雨的水量.经对1986年～1989年各次降雨估算表明,非本次降雨贡献最高可达50.5%.(2)非饱和带壤中流和饱和带地下水径流中必有非本次降雨的水量,并与地面径流一样,在次降雨径流过程中有时程变化.(3)对不同径流组成的流量过程,非本次降雨所占的比重不同.通过分析,可知降雨径流相关关系中的一一对应假定不确切,认为:传统的降雨径流经验关系和单位线概念需重新考虑;传统的过程线经验划分方法和现行同位素划分方法的有关基本假定不完全符合实际.
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| 关 键 词： | 实验流域 降雨径流关系 环境同位素 |
| 收稿时间： | 1991-12-31 |
Experimental Research on Catchment Runoff Responses Traced by Environmental Isotopes |
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| Gu Weizu.Experimental Research on Catchment Runoff Responses Traced by Environmental Isotopes[J].Advances in Water Science,1992,3(4):246-254. |
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| Authors: | Gu Weizu |
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| Affiliation: | Nanjing Institute of Hydrology and Water Resources |
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| Abstract: | The isotopic composition(T,180)of rainfall asd various runoff components including interflow from unsaturated zone and groundwater flow from saturated zone was monitored during the rainfall events of 1986-1989 in a special designed eaperimeatal catchment with all the runoff components are measurable. The contribution of prevenient water (old water) to surface runoff is identified and the portion of old water ranged from 0% to 50.5% is estimated. It implies that the current concept which considers surface runoff is always orginated from event rainfall is very likely a misconception. The different contributions of old water in interfiow and groundwater flow are identifled and estimated, too. The ezistance of temporal isotopic variability of runoff components during rainfall events demonstrates the temporal variations of old water composition in these components. For the four patterns of hydrograph with different combinations of runoff components, different compositions of old water are found ranged from 0% to 77%.As a comparison, several natural basins were sampled. From these results, it is shown that the current method of hydrograph separation up to now used widely in this country is, unrealistic in generally. These results also pose questions about the concepts related to rainfall-runoff relationships and to the UH analyses. |
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| Keywords: | experimental basin rainfall-runoff relationship enviroamental isotope |
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