APPLICABILITY OF ISOTOPIC HYDROGRAPH SEPARATION IN A SUBURBAN BASIN DURING SNOWMELT

被引：36

作者：

BUTTLE, JM

VONK, AM

TAYLOR, CH

机构：

[1] Department of Geography, Trent University, Peterborough, Ontario

[2] Trent University, Peterborough, Ontario

[3] Department of Geography, Trent University, Peterborough, Ontario

来源：

HYDROLOGICAL PROCESSES | 1995年 / 9卷 / 02期

关键词：

SNOWMELT; SUBURBANIZATION; ISOTOPIC HYDROGRAPH SEPARATION; RUNOFF PROCESSES;

D O I：

10.1002/hyp.3360090206

中图分类号：

TV21 [水资源调查与水利规划];

学科分类号：

081501 ;

摘要：

Methodological issues associated with isotopic hydrograph separations (IHSs) in built-up environments are explored using results from the 1990 spring melt in a suburban basin in Peterborough, Ontario, Canada. The heterogeneous nature of suburban environments complicates the selection of appropriate isotopic signatures for event and pre-event waters. Near-stream groundwater delta(18)O sampled from wells was poorly mixed, such that the pre-event water signature was best characterized by delta(18)O in pre-melt baseflow or discharge from a headwater spring. The event water signature during snowmelt can be characterized using delta(18)O in the pre-melt snowpack, surface runoff samples or meltwater from lysimeters. However, the use of snowpack delta(18)O may be inappropriate in suburban basins where meltwater from thin snowcover may exhibit pronounced responses to delta(18)O in rainfall contributions. Intensive sampling of the spatial variability of runoff or meltwater delta(18)O may be required to characterize the average event water signature adequately. Rainfall delta(18)O provided an appropriate event water signal during a large rain on snow event, and differences between this IHS and one generated using an event water signature that included meltwater contributions from snow-covered surfaces were within the uncertainty attributable to the analytical error in delta(18)O values. Event water supplied 55-63% of the peak discharge and 48-58% of total runoff from the basin during the melt, which is consistent with the fraction of the basin that has been developed. These results contrast with IHSs conducted in forested basins that suggest that stormflow is dominated by pre-event water contributions.

引用

页码：197 / 211

页数：15

共 30 条

[1] Bengtsson L., Westerstrom G., Urban snowmelt and runoff in northern Sweden, Hydrol. Sci. J., 37, pp. 263-275, (1992)
[2] Bishop K.H., (1991)
[3] Bonell M., Pearce A.J., Stewart M.K., The identification of runoff‐production mechanisms using environmental isotopes in a tussock grassland catchment, eastern Otago, New Zealand, Hydrol. Process., 4, pp. 15-34, (1990)
[4] Buttle J.M., Snow accumulation and snowmelt runoff in a suburban environment, Proc. East. Snow Conf., 42, pp. 126-138, (1986)
[5] Buttle J.M., Effects of suburbanization upon snowmelt runoff, Hydrol. Sci. J., 35, pp. 285-302, (1990)
[6] Buttle J.M., Isotope hydrograph separations and rapid delivery of pre‐event water from drainage basins, Prog. Phys. Geogr., 18, pp. 16-41, (1994)
[7] Buttle J.M., Sami K., Testing the groundwater ridging hypothesis of streamflow generation during snowmelt in a forested catchment, J. Hydrol., 135, pp. 53-72, (1992)
[8] Buttle J.M., Xu F., Snowmelt runoff in suburban environments, Nordic Hydrol., 19, pp. 19-40, (1988)
[9] Buttle J.M., Sami K., Xu F., Resolution of data limitations facing snowmelt runoff modelling in suburban areas, Proceedings of the International Conference on Urban Hydrology under Wintry Conditions, Narvik, Norway, 19–21 March 1990, (1990)
[10] Buttle J.M., Vonk A., Taylor C.H., Environmental isotope hydrograph separation during snowmelt in a suburban catchment, Proc. East. Snow Conf., 49, pp. 1-12, (1992)

← 1 2 3 →