Elsevier

Journal of Hydrology

Volume 84, Issues 1–2, 15 April 1986, Pages 107-140
Journal of Hydrology

Research paper
Determination of the components of stormflow using water chemistry and environmental isotopes, Mattole River basin, California

https://doi.org/10.1016/0022-1694(86)90047-8Get rights and content

Abstract

The chemical and isotopic composition of rainfall and stream water was monitored during a storm in the Mattole River basin of northwestern California. About 250 mm of rain fell during 6 days (∼80% within a 42 h period) in late January, 1972, following 24 days of little or no precipitation. River discharge near Petrolia increased from 22 m3 s−1 to a maximum of 1300 m3 s−1 while chloride and silica concentrations decreased only from 3.2 to 2.1 and 11.5 to 8.6 mgl−1, respectively. Meanwhile, the isotopic composition of the river changed from δD = − 42‰, δ180 = − 6.8‰ and 40 tritium units (T.U.) to extreme values at highest flow of δD = − 35‰, δ180 = − 5.9‰ and 25 T.U. in response to volume-weighted rainfall averaging δD = − 19.5‰, δ180 = − 3.1‰ and 18 T.U.

Despite much rainfall of a composition quite different from that of the prestorm river water, “buffering” processes in the watershed greatly restricted changes in the chemical and isotopic content of the river during storm runoff. Because of the physical and hydrologic characteristics of the watershed, major contributions of groundwater to stormflow are very unlikely. The large increase in dissolved chemical load observed at maximum river discharge required that extensive interaction with, and presumably penetration of, soils occurred within a few hours time. Such a large increase in chemical load also required subsurface stormflow throughout a high proportion of the watershed. Chemical and isotopic stabilization of stormflow is believed to be due mainly to displacement of prestorm soil water, with some effects on river chemistry due to rapid rain-soil interactions.

The isotopic and chemical composition of prestorm soil moisture cannot readily be predicted a priori because of possible variability in rainfall composition, evaporation, and exchange with atmospheric moisture, nor can it be assumed that baseflow has a predictable relation to the chemical or isotopic composition of water displaced from soils during storms. Therefore, it seems inappropriate to draw conclusions as to the relative proportions of groundwater and rainfall in runoff from a particular storm based only on the average compositions of rainfall, stormflow, and prestorm river water, as has been done in most previous isotope hydrograph studies.

Given the great variation in hydrology, topography, soil characteristics, rainfall intensity and quantity, etc. from place to place, the relative amount of overland flow, subsurface flow from the unsaturated zone and of groundwater in stormflow can vary greatly in time and space.

References (70)

  • R.P. Betson

    What is watershed runoff

    J. Geophys. Res.

    (1964)
  • K.J. Beven et al.

    Macropores and water flow in soils

    Water Resour. Res.

    (1982)
  • O.P. Bricker et al.

    Mineral-water interaction during the chemical weathering of silicates

  • H. Craig

    Isotopic variations in meteoric waters

    Science

    (1961)
  • W. Dangaard

    Stable isotopes in precipitation

    Tellus

    (1964)
  • T. Dincer et al.

    Snowmelt runoff from measurements of tritium and oxygen-18

    Water Resour. Res.

    (1970)
  • T. Dunne

    Models of runoff processes and their significance

  • W.H. Durum

    Relation of mineral constituents in solution to streamflow, Saline River near Russel, Kansas

    Am. Geophys. Union, Trans.

    (1953)
  • S. Epstein

    Variations of the 18O16O ratios of fresh water and ice

    Natl. Acad. Sci., Nucl. Sci. Ser. Rep.

    (1956)
  • P. Fritz et al.

    Storm runoff analyses using environmental isotopes and major ions

  • J.R. Gat et al.

    Modification of the isotopic composition of rainwater by processes which occur before groundwater recharge

  • H. Gebhardt et al.

    Anion adsorption by allophanic tropical soils: Chloride adsorption

  • R.E. Grim

    Clay Mineralogy

  • R.E. Hanes

    Chloride reactions in soils

  • G.E. Hendrickson et al.

    Relationship of chemical quality of water to stream discharge in Kentucky

  • A. Herrmann et al.

    Groundwater-runoff relationships

    Catena

    (1980)
  • J.D. Hewlett

    Soil moisture as a source of base flow from steep mountain watersheds

    U.S. Dep. of Agriculture, Southeastern Forest Experiment Sta., Pap.

    (1961)
  • J.D. Hewlett

    Principles of Forest Hydrology

  • J.D. Hewlett et al.

    Factors affecting the response of small watersheds to precipitation in humid areas

  • R.E. Horton

    The role of infiltration in the hydrological cycle

    Am. Geophys. Union, Trans.

    (1933)
  • J.H. Horton et al.

    Flow path of rain from the soil surface to the water table

    Soil Sci.

    (1965)
  • P. Hubert et al.

    Aspects hydrologiques et sédimentologiques de la crue exceptionnelle de la Dranse du Chablais du 22 Septembre 1968

    Arch. Sci. Geneve

    (1969)
  • C.R. Hursh

    Storm-water and absorption

    Discussion of List of Terms with Definitions

    Rep. of the Committee on Absorption and Transpiration. Am. Geophys. Union, Trans.

    (1936)
  • C.R. Hursh

    Report of the subcommittee on subsurface flow

    Am. Geophys. Union, Trans.

    (1944)
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