Water balance modelling in lateritic terrain
作者:
Elin Langsholt,
期刊:
Hydrological Processes
(WILEY Available online 1994)
卷期:
Volume 8,
issue 1
页码: 83-99
ISSN:0885-6087
年代: 1994
DOI:10.1002/hyp.3360080107
出版商: John Wiley&Sons, Ltd
关键词: Laterites;Soil physical variability;Stochastic models;Water balance
数据来源: WILEY
摘要:
AbstractAn analytical approximate model for unsaturated flow in a spatially variable field, coupled with infiltration and evapotranspiration at the upper boundary and a fluctuating water‐table at the lower boundary, has been developed. The unsaturated flow equations depend on parameterizations of θ(Φ) and K(Φ). They are based on the notion of a moving, discontinuous front. The field heterogeneity refers to saturated hydraulic conductivity only. Horizontal variability is considered, and the flow medium is approximated as a set of uncorrelated, vertically homogeneous columns. Expectations and variances obtained with this approach have been compared with observations of the field hydrological processes. Three important aspects of the hydrology in this lateritic terrain are rapid water‐table response, Hortonian surface runoff generation and soil suction variability. The stochastic conceptualization used explains to a high degree these characteristics, although some limitations are demons
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