Experimental Research on Catchment Runoff Responses Traced by Environmental Isotopes

Gu Weizu

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.

Nanjing Institute of Hydrology and Water Resources

Received Date: 1991-12-31

Rev Recd Date: 1992-04-14

Publish Date: 1992-10-25

Key words:

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.

HTML

Reference (7)

[1]	RK 林斯雷.MA寇乐,JLH保罗赫斯.工程水文学.刘光文等译.北京:水利电力出版社,1981.232
[2]	罔本芳美.技术水文学.日刊工业新闻社,昭和57年.176
[3]	长江流域规划办公室主编.水文预报方法.北京,水利电力出版社,1979. 80, 87, 78
[4]	H Craig. Standard for reporting concentrations of deuterium and oxygen-18 in natural water.Science. 1991.133:1833.1834
[5]	Kendall C, Gu Weizu. Development of isotopically heterogeneous infiltration waters in an artificial catchment in Chuzhou, China. Proceedings of International Symposium Isotope Techniques in Water Resources Development 1991. IAEA, 1992. 66
[6]	Sklash M G, Farvolden R N. The use of environmental isotopes in the study of high-runoff episodes in streams. Isotope Studies of Hydrologic Processes. Illinois University. Press, 1982. 66-67
[7]	Gu Weizu. Field research on surface water and subsurface water relationships in an artificial experimental catchment. Proceedinss of International Syuiposium Interaction Between Groundwater and Surface Water. Sweden, 1968. 35-36

[1]	RK 林斯雷.MA寇乐,JLH保罗赫斯.工程水文学.刘光文等译.北京:水利电力出版社,1981.232
[2]	罔本芳美.技术水文学.日刊工业新闻社,昭和57年.176
[3]	长江流域规划办公室主编.水文预报方法.北京,水利电力出版社,1979. 80, 87, 78
[4]	H Craig. Standard for reporting concentrations of deuterium and oxygen-18 in natural water.Science. 1991.133:1833.1834
[5]	Kendall C, Gu Weizu. Development of isotopically heterogeneous infiltration waters in an artificial catchment in Chuzhou, China. Proceedings of International Symposium Isotope Techniques in Water Resources Development 1991. IAEA, 1992. 66
[6]	Sklash M G, Farvolden R N. The use of environmental isotopes in the study of high-runoff episodes in streams. Isotope Studies of Hydrologic Processes. Illinois University. Press, 1982. 66-67
[7]	Gu Weizu. Field research on surface water and subsurface water relationships in an artificial experimental catchment. Proceedinss of International Syuiposium Interaction Between Groundwater and Surface Water. Sweden, 1968. 35-36

Experimental Research on Catchment Runoff Responses Traced by Environmental Isotopes

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Article Metrics

Proportional views

Related