An evaluation of approaches for modelling hydrological processes in high‐elevation, glacierized Andean watersheds

• DOI: 10.1002/hyp.10055
• Publication Date: 2013-09-06T17:04:47Z
• Authors: S. Ragettli; G. Cortés; J. McPhee; F. Pellicciotti
• Keywords: Snowmelt; Hydrological modelling; Elevation (ballistics); Distributed element model; Hydrometeorology; Conceptual model

Abstract We use two hydrological models of varying complexity to study the Juncal River Basin in Central Andes Chile with aim understand degree conceptualization and spatial structure that are needed model present future streamflows. a conceptual semi‐distributed based on elevation bands [Water Evaluation Planning (WEAP)], frequently used for water management, physically oriented, fully distributed [Topographic Kinematic Wave Approximation Integration ETH Zurich (TOPKAPI‐ETH)] developed research purposes mainly. evaluate ability reproduce key processes basin emphasis snow accumulation melt, streamflow relationships between internal processes. Both capable reproducing observed runoff evolution Moderate‐resolution Imaging Spectroradiometer cover adequately. In spite WEAP's simple approach modelling snowmelt its lack glacier representation gravitational redistribution as well proper routing algorithm, this can historical data similar goodness fit more complex TOPKAPI‐ETH. show performance both be improved by using measured precipitation gradients higher temporal resolution. contrast good climate, however, we demonstrate simplifications WEAP lead error compensation, which results different predictions simulated melt potentially warmer climate. TOPKAPI‐ETH, physical processes, depends less calibration thus is subject compensation errors through components. Our obtained locally ad hoc short‐term field campaigns complement extrapolated from long‐term records simulating changes cycle high‐elevation catchments but these only efficiently applying spatially Copyright © 2013 John Wiley & Sons, Ltd.