Land Use Effect on the CN Model Parameters in a Tropical Dry Environment

E. M Andrade, J. R Araújo Neto, M. J. S Guerreiro (), J. C. N Santos and H. A. Q Palácio
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E. M Andrade: Universidade Federal do Ceará, Campus do Pici
J. R Araújo Neto: IFCE, Campus Iguatu
M. J. S Guerreiro: FP-ENAS, Universidade Fernando Pessoa
J. C. N Santos: Instituto Federal do Triângulo Mineiro - Campus Uberlândia
H. A. Q Palácio: IFCE, Campus Iguatu

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2017, vol. 31, issue 13, No 5, 4103-4116

Abstract: Abstract Dry tropical forests account for over 1,000,000 km2, and there is still lack of knowledge on their hydrologic processes. The curve number (CN) hydrologic model developed by the Natural Resources Conservation Service (NRCS) is widely applied for runoff determination in various parts of the world, but not so in tropical semiarid regions. This study analyzes the impact of land use changes on the CN model in a tropical semiarid environment, in two catchments of native dry tropical forest and thinned dry tropical forest land use from 2009 to 2012. The CN model was calibrated and validated for the NRCS recommended initial abstraction ratio λ = 0.2, and for λ evaluated from rainfall and runoff data. A reliability analysis was performed using Monte Carlo simulation. Model goodness-of-fit was assessed with statistical criteria. A total of 42 and 40 rainfall-runoff events were analyzed for the native and thinned dry tropical forest, respectively. Characteristic λ values of 0.15 and 0.11 were determined for the two respective catchments. Although CN values were similar for both land uses, CNλ=0.20 = 80 and CNmedian λ = 77, the thinned catchment showed a higher CN model parameters variability. The CN model was more sensitive to variations of CN values than to those of λ. This study showed that no matter the vegetation management in a dry tropical forest environment, modeled runoff is not affected by λ, but rather affected by CN, which represents soil, landuse and management.

Keywords: Runoff coefficient; Groundcover; Hydrologic processes; Curve number; Initial abstraction ratio (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1007/s11269-017-1732-4

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