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Gharari, S. (author), Hrachowitz, M. (author), Fenicia, F. (author), Savenije, H.H.G. (author)Conceptual hydrological models rely on calibration for the identification of their parameters. As these models are typically designed to reflect real catchment processes, a key objective of an appropriate calibration strategy is the determination of parameter sets that reflect a “realistic” model behavior. Previous studies have shown that...journal article 2013
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- Gao, H. (author), Hrachowitz, M. (author), Fenicia, F.F. (author), Gharari, S. (author), Sriwongsitanon, N. (author), Savenije, H.H.G. (author) journal article 2015
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Hrachowitz, M. (author), Fovet, O. (author), Ruiz, L. (author), Euser, T. (author), Gharari, S. (author), Nijzink, R. (author), Freer, J. (author), Savenije, H.H.G. (author), Gascuel-Odoux, C. (author)Hydrological models frequently suffer from limited predictive power despite adequate calibration performances. This can indicate insufficient representations of the underlying processes. Thus, ways are sought to increase model consistency while satisfying the contrasting priorities of increased model complexity and limited equifinality. In this...journal article 2014
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Gharari, S. (author), Hrachowitz, M. (author), Fenecia, F. (author), Gao, H. (author), Savenije, H.H.G. (author)Conceptual environmental systems models, such as rainfall runoff models, generally rely on calibration for parameter identification. Increasing complexity of this type of model for better representation of hydrological process heterogeneity typically makes parameter identification more difficult. Although various, potentially valuable,...journal article 2013
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Gharari, S. (author), Hrachowitz, M. (author), Fenicia, F. (author), Gao, H. (author), Savenije, H.H.G. (author)Conceptual environmental system models, such as rainfall runoff models, generally rely on calibration for parameter identification. Increasing complexity of this type of models for better representation of hydrological process heterogeneity, typically makes parameter identification more difficult. Although various, potentially valuable,...journal article 2014
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Bouaziz, L.J.E. (author), Aalbers, Emma (author), Weerts, Albrecht H. (author), Hegnauer, Mark (author), Buiteveld, Hendrik (author), Lammersen, Rita (author), Stam, Jasper (author), Sprokkereef, Eric (author), Savenije, Hubert (author), Hrachowitz, M. (author)Future hydrological behavior in a changing world is typically predicted based on models that are calibrated on past observations, disregarding that hydrological systems and, therefore, model parameters may change as well. In reality, hydrological systems experience almost continuous change over a wide spectrum of temporal and spatial scales. In...journal article 2022
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- Nijzink, R.C. (author), Samaniego, L (author), Mai, J (author), Kumar, R (author), Thober, S (author), Zink, M (author), Schafer, D (author), Savenije, Hubert (author), Hrachowitz, M. (author) journal article 2016
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Gharari, Shervan (author), Gupta, Hoshin V. (author), Clark, Martyn P. (author), Hrachowitz, M. (author), Fenicia, Fabrizio (author), Matgen, Patrick (author), Savenije, Hubert (author)Process-based hydrological models seek to represent the dominant hydrological processes in a catchment. However, due to unavoidable incompleteness of knowledge, the construction of “fidelius” process-based models depends largely on expert judgment. We present a systematic approach that treats models as hierarchical assemblages of hypotheses ...journal article 2021
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Hulsman, P. (author), Savenije, Hubert (author), Hrachowitz, M. (author)Study region: The study area is the river basin upstream of the Kariba dam located in the Zambezi River at the border of Zambia and Zimbabwe. Study focus: During the dry season of 2019 in Sub-Saharan Africa, extremely low water levels occurred in the Zambezi. According to news media, locals perceived this drought as the worst in several...journal article 2021
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Bouaziz, L.J.E. (author), Fenicia, Fabrizio (author), Thirel, Guillaume (author), de Boer-Euser, Tanja (author), Buitink, Joost (author), Brauer, Claudia C. (author), De Niel, Jan (author), Savenije, Hubert (author), Hrachowitz, M. (author)Streamflow is often the only variable used to evaluate hydrological models. In a previous international comparison study, eight research groups followed an identical protocol to calibrate 12 hydrological models using observed streamflow of catchments within the Meuse basin. In the current study, we quantify the differences in five states and...journal article 2021
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Hulsman, P. (author), Hrachowitz, M. (author), Savenije, Hubert (author)In the Luangwa basin in Zambia, long-term total water storage variations were observed with Gravity Recovery and Climate Experiment, but not reproduced by a standard conceptual hydrological model that encapsulates our current understanding of the dominant regional hydrological processes. The objective of this study was to identify potential...journal article 2021
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Hulsman, P. (author), Savenije, Hubert (author), Hrachowitz, M. (author)Satellite observations can provide valuable information for a better understanding of hydrological processes and thus serve as valuable tools for model structure development and improvement. While model calibration and evaluation have in recent years started to make increasing use of spatial, mostly remotely sensed information, model...journal article 2021
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Gao, H. (author), Hrachowitz, M. (author), Sriwongsitanon, Nutchanart (author), Fenicia, F. (author), Gharari, S. (author), Savenije, Hubert (author)Understanding which catchment characteristics dominate hydrologic response and how to take them into account remains a challenge in hydrological modeling, particularly in ungauged basins. This is even more so in nontemperate and nonhumid catchments, where—due to the combination of seasonality and the occurrence of dry spells—threshold processes...journal article 2016
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Savenije, Hubert (author), Hrachowitz, M. (author)Catchment-scale hydrological models frequently miss essential characteristics of what determines the functioning of catchments. The most important active agent in catchments is the ecosystem. It manipulates and partitions moisture in a way that supports the essential functions of survival and productivity: infiltration of water, retention of...journal article 2017
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Nijzink, R.C. (author), Hutton, Christopher (author), Pechlivanidis, Ilias (author), Capell, René (author), Arheimer, Berit (author), Freer, Jim (author), Han, Dawei (author), Wagener, Thorsten (author), McGuire, Kevin (author), Savenije, Hubert (author), Hrachowitz, M. (author)The core component of many hydrological systems, the moisture storage capacity available to vegetation, is impossible to observe directly at the catchment scale and is typically treated as a calibration parameter or obtained from a priori available soil characteristics combined with estimates of rooting depth. Often this parameter is...journal article 2016
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de Boer-Euser, Tanja (author), McMillan, H (author), Hrachowitz, M. (author), Winsemius, H.C. (author), Savenije, Hubert (author)Root zone storage capacity ( S r ) is an important variable for hydrology and climate studies, as it strongly influences the hydrological functioning of a catchment and, via evaporation, the local climate. Despite its importance, it remains difficult to obtain a well-founded catchment representative estimate. This study tests the hypothesis that...journal article 2016
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Dembele, M. (author), Hrachowitz, M. (author), Savenije, Hubert (author), Mariéthoz, Grégoire (author), Schaefli, Bettina (author)Hydrological model calibration combining Earth observations and in situ measurements is a promising solution to overcome the limitations of the traditional streamflow-only calibration. However, combining multiple data sources in model calibration requires a meaningful integration of the data sets, which should harness their most reliable...journal article 2020
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Bouaziz, L.J.E. (author), Steele-Dunne, S.C. (author), Schellekens, Jaap (author), Weerts, Albrecht H. (author), Stam, Jasper (author), Sprokkereef, Eric (author), Winsemius, H.C. (author), Savenije, Hubert (author), Hrachowitz, M. (author)The spatiotemporal dynamics of water volumes stored in the unsaturated root zone are a key control on the response of terrestrial hydrological systems. Robust, catchment-scale root-zone soil moisture estimates are thus critical for reliable predictions of river flow, groundwater recharge, or evaporation. Satellites provide estimates of near...journal article 2020
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Bouaziz, L.J.E. (author), Weerts, Albrecht (author), Schellekens, Jaap (author), Sprokkereef, Eric (author), Stam, Jasper (author), Savenije, Hubert (author), Hrachowitz, M. (author)Intercatchment groundwater flows (IGFs), defined as groundwater flows across topographic divides, can occur as regional groundwater flows that bypass headwater streams and only drain into the channel further downstream or directly to the sea. However, groundwater flows can also be diverted to adjacent river basins due to geological features ...journal article 2018
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Hulsman, P. (author), Winsemius, H.C. (author), Michailovsky, Claire I. (author), Savenije, Hubert (author), Hrachowitz, M. (author)Limited availability of ground measurements in the vast majority of river basins world-wide increases the value of alternative data sources such as satellite observations in hydrological modelling. This study investigates the potential of using remotely sensed river water levels, i.e. altimetry observations, from multiple satellite missions...journal article 2020