Abstract
Quantifying evapotranspiration (ET) rates in urban environments is paramount for understanding and modeling other hydrologic fluxes such as runoff and recharge. Large impermeable fractions of land in urban areas may only experience evaporation following rainfall events. Pervious fractions are believed to support most of the ET burden. Point measurements of land-cover ET in pervious areas can provide better estimates of the overall urban ET budget. These can be made by examining changes in the total soil moisture above the seasonal low water table or the ET extinction depth. Soil moisture can be determined by summing the average soil moisture content measured at various depths with capacitance sensors on a vertical probe. Graphs of total soil moisture above the water table for a riparian area in west-central Florida display two distinct slopes, a flattened slope during the overnight period and a steeper slope between approximately 9:00 am and 6:00 pm. The overnight slope is believed to correspond to a process removing moisture continually from the soil, such as gravity drainage. The daylight portion of the slope corresponds to ET plus the continuing downward gravity drainage. Daylight ET is the cause of the difference between the two slopes. Different plant communities exhibit measurably different ET rates and can be estimated using this methodology.
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REFERENCES
Bastiaanssen, W. G. M., Menenti, M., Feddes, R. A., and Holtslag, A. A. M., 1998, A remote sensing surface energy balance algorithm for land (SEBAL). 1. Formulation, J. Hydro. 212–213:198–212.
Brooks, K. N., Ffolliott, P. F., Gregersen, H. M., and DeBano, L. F., 1997, Hydrology and the management of watersheds, 2nd ed., Iowa State University Press, Ames Iowa, 43 pp.
DHI, 2004, (September 16, 2004); http://www.dhisoftware.com/mikeshe/.
Kustasa, W. P., and Norman, J. M., 1999, Evaluation of soil and vegetation heat flux predictions using a simple two-source model with radiometric temperatures for partial canopy cover, Agric. For. Meteorol, 94(1):13–29.
Lu, J., Sun, G., McNulty, S. G., and Amatya, D. M., 2003, Modeling actual evapotranspiration from forested watersheds across the southeastern United States. J. Am. Water Res. Assn. 39(4):887–896.
Mackay, D. S., Samanta, S., Nemani, R. R., and Band, L. E., 2003, Multi-objective parameter estimation for simulating canopy transpiration in forested watersheds, J. Hydro., 277(3–4):230–247.
Maidment, D. R.,1992, Handbook of Hydrology, McGraw-Hill, Inc., New York, pp.4.1–4.53.
Mauser, W., and Schadlich, S., 1998, Modelling the spatial distribution of evapotranspiration on different scales using remote sensing data, J. Hydro., 212–213:250–267.
Mo, X., Liua, S., Lina, Z., and Zhao, W., 2004, Simulating temporal and spatial variation of evapotranspiration over the Lushi basin, J. Hydro., 285(1–4):125–142.
Monteith, J. L., 1965, Evaporation and the environment, Symp. Soc. Expl. Biol. 19:205–234.
Ross, M., Geurink, J., Tara, P., Trout, K., and Jobes, T., 2004. Integrated Hydrologic Model (IHM) Volume 1: Theory Manual, Prepared for Tampa Bay Water Publication Number USF-CMHAS 0383.0304.58, University of South Florida, Tampa Florida.
Ross, M., Trout, K., Tara, P., Said, A., and Geurink, J., 2005. A new discretization scheme for integrated surface and groundwater modeling, J. Hydro. Sci. and Tech., 21(1–4):143– 156.
Sentek, 2004, (September 15, 2004); http://www.sentek.com.au/home/.
Shuttleworth, W. J., Gash, J. H. C., Lloyd, C. R., McNeil, D. D., Moore, C. J., and Wallace, J. S., 1988. An integrated micrometeorological system for evaporation measurement. Agric. For. Meteorol, 43:295–317.
Sun, G., Amatya, D. M., Skaggs, R. W., Swift, Jr., L. W., Shepard, J. P., and Riekerk, H., 2002, A comparison of the watershed hydrology of coastal forested wetlands and the mountainous uplands in the Southern US, J. Hydro, 263(1–4):92–104.
Sun, G., Riekerk, H., and Comerford, N B., 1998, Modeling the forest hydrology of wetlandupland ecosystems in Florida, J. Am. Water Res. Assn, 34(4):827–841.
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Trout, K., Ross, M. (2006). ESTIMATING EVAPOTRANSPIRATION IN URBAN ENVIRONMENTS. In: Tellam, J.H., Rivett, M.O., Israfilov, R.G., Herringshaw, L.G. (eds) Urban Groundwater Management and Sustainability. NATO Science Series, vol 74. Springer, Dordrecht. https://doi.org/10.1007/1-4020-5175-1_12
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DOI: https://doi.org/10.1007/1-4020-5175-1_12
Publisher Name: Springer, Dordrecht
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