Journal ArticleDOI
The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models
TLDR
In this paper, the authors examined some of the problems of deriving flow pathways from raster digital terrain data in the context of hydrological predictions using TOPMODEL and proposed a strategy for the case where downslope subsurface flow pathways may deviate from those indicated by the surface topography.Abstract:
The accuracy of the predictions of distributed hydrological models must depend in part on the proper specification of flow pathways. This paper examines some of the problems of deriving flow pathways from raster digital terrain data in the context of hydrological predictions using TOPMODEL. Distributed moisture status is predicted in TOPMODEL on the basis of spatial indices that depend on flow path definition. The sensitivity of this index to flow path algorithm and grid size is examined for the case where the surface topography is a good indicator of local hydraulic gradients. A strategy for the case where downslope subsurface flow pathways may deviate from those indicated by the surface topography is described with an example application.read more
Citations
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Journal ArticleDOI
A new method for the determination of flow directions and upslope areas in grid digital elevation models
TL;DR: In this paper, a new procedure for the representation of flow directions and calculation of upslope areas using rectangular grid digital elevation models is presented, based on representing flow direction as a single angle taken as the steepest downward slope on the eight triangular facets centered at each grid point.
Journal ArticleDOI
Hydrological functions of tropical forests: not seeing the soil for the trees?
TL;DR: In this article, a wide range of available scientific evidence with respect to the influence exerted by the presence or absence of a good forest cover on regional climate (rainfall), total and seasonal water yield (floods, low flows), as well as on different forms of erosion and catchment sediment yield under humid tropical conditions in general and in southeast Asia in particular.
Journal ArticleDOI
Predictive vegetation mapping: geographic modelling of biospatial patterns in relation to environmental gradients:
TL;DR: Predictive vegetation mapping as discussed by the authors is defined as predicting the geographic distribution of the vegetation composition across a landscape from mapped environmental variables, which is made possible by the availability of digital maps of topography and other environmental variables such as soils, geology and climate variables.
Journal ArticleDOI
Mathematical modeling of watershed hydrology.
TL;DR: In this article, a historical perspective of watershed hydrology modeling is provided, and new developments and challenges in watershed models are discussed, while model validation, error propagation, and analyses of uncertainty, risk, and reliability have not been treated as thoroughly.
Journal ArticleDOI
Digital elevation model grid size, landscape representation, and hydrologic simulations
Weihua Zhang,David R. Montgomery +1 more
TL;DR: In this article, high-resolution digital elevation data from two small catchments in the western United States were used to examine the effect of digital elevation model (DEM) grid size on the portrayal of the land surface and hydrologic simulations.
References
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A physically based, variable contributing area model of basin hydrology
Mike Kirkby,Keith Beven +1 more
TL;DR: In this paper, a hydrological forecasting model is presented that attempts to combine the important distributed effects of channel network topology and dynamic contributing areas with the advantages of simple lumped parameter basin models.
Journal ArticleDOI
Prediction of Surface Saturation Zones in Natural Catchments by Topographic Analysis
TL;DR: In this paper, the topography of hillslopes or whole catchments is analyzed numerically to calculate local geometric and drainage attributes that can be combined to test for the expectation of soil waterlogging.
Journal ArticleDOI
Topographic Partition of Watersheds with Digital Elevation Models
TL;DR: In this paper, the authors describe a methodology for parameterization of a distributed components approach to watershed simulation, which is designed to aid in the efficient parameterization and organization of watershed data as input to hydrologic simulation models.
Journal ArticleDOI
Catchment geomorphology and the dynamics of runoff contributing areas
Keith Beven,Eric F. Wood +1 more
TL;DR: In this article, an extension of the Beven-Kirkby model is proposed to predict variable contributing areas and the results showed that the improved model is worthy of further study.
Journal ArticleDOI
Saturation regions in catchments and their relations to soil and topographic properties
TL;DR: In this paper, the authors derived criteria for the existence of saturated areas on draining hillslopes in natural catchments in terms of soil transmissivity, the hillslope gradient and its wetness state, characterised by the baseflow discharge from the catchment.
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