astronomy

Jens Christian Refsgaard

Jens Christian Refsgaard is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Jens Christian Refsgaard rather than just read about it. In short: Jens Christian Refsgaard is a hydrologist and academic. He is an emeritus professor at the Geological Survey of Denmark and Greenland.

Key takeaways

Jens Christian Refsgaard belongs to astronomy; place it in that map before memorising details.
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Reference excerpt

Jens Christian Refsgaard is a hydrologist and academic. He is an emeritus professor at the Geological Survey of Denmark and Greenland. Refsgaard's research focuses on hydrological modelling, uncertainty analysis, and water resources.

Education Refsgaard completed his Master's in Hydrology from the Technical University of Denmark in 1976. Later, he obtained a Doctorate in Natural Science from the University of Copenhagen in 2007.

Career Refsgaard was appointed as an assistant professor Technical University of Denmark in 1978 before becoming an associate professor in 1982, and remained in that position until 1984. Simultaneously, he worked at the Danish Hydraulic Institute (DHI) from 1980 to 2000. He was then a research professor at the Geological Survey of Denmark and Greenland from 2000 to 2018 and has been an emeritus professor there since 2019.

Research Refsgaard's research has focused on catchment modelling, good modelling practice, uncertainty assessment, and water resources. In catchment modelling, he has worked with physically based hydrological systems such as the MIKE SHE. His work has addressed model parametrization, calibration and validation, as well as comparative evaluation, and has also examined the methodological development of hydrological models. He has contributed to the formulation of guidance on good modelling practice to support appropriate and consistent model use. In the area of uncertainty assessment of models, Refsgaard has studied approaches for identifying and analysing uncertainties. His publications have highlighted the implications of model structure error and strategies for addressing geological uncertainty in groundwater flow modelling. He has also outlined the modelling procedure and defined modelling uncertainty. Beyond modelling, Refsgaard's research has examined groundwater–surface water interactions in Denmark through analyses of geomorphological, geological, and hydrological characteristics across multiple regional catchment types. His work has also discussed the accelerating impacts of climate change on the Baltic Sea, describing it as indicative of future coastal ocean conditions.

Awards and honors 2005 – Fellow, The Danish Academy of Technical Sciences 2011 – G.O. Andrup Groundwater Award, Vandcenter Syd

Selected articles Refsgaard, Jens Christian; Knudsen, Jesper (July 1996). "Operational Validation and Intercomparison of Different Types of Hydrological Models". Water Resources Research. 32 (7): 2189–2202. Bibcode:1996WRR....32.2189R. doi:10.1029/96WR00896. Refsgaard, Jens Christian (November 1997). "Parameterisation, calibration and validation of distributed hydrological models". Journal of Hydrology. 198 (1–4): 69–97. Bibcode:1997JHyd..198...69R. doi:10.1016/S0022-1694(96)03329-X. Refsgaard, Jens Christian; Henriksen, Hans Jørgen (January 2004). "Modelling guidelines––terminology and guiding principles". Advances in Water Resources. 27 (1): 71–82. Bibcode:2004AdWR...27...71R. doi:10.1016/j.advwatres.2003.08.006. Refsgaard, Jens Christian; van der Sluijs, Jeroen P.; Brown, James; van der Keur, Peter (November 2006). "A framework for dealing with uncertainty due to model structure error". Advances in Water Resources. 29 (11): 1586–1597. Bibcode:2006AdWR...29.1586R. doi:10.1016/j.advwatres.2005.11.013. Refsgaard, Jens Christian; van der Sluijs, Jeroen P.; Højberg, Anker Lajer; Vanrolleghem, Peter A. (November 2007). "Uncertainty in the environmental modelling process – A framework and guidance". Environmental Modelling & Software. 22 (11): 1543–1556. Bibcode:2007EnvMS..22.1543R. doi:10.1016/j.envsoft.2007.02.004. Refsgaard, Jens Christian; Stisen, Simon; Koch, Julian (January 2022). "Hydrological process knowledge in catchment modelling – Lessons and perspectives from 60 years development". Hydrological Processes. 36 (1) e14463. Bibcode:2022HyPr...36E4463R. doi:10.1002/hyp.14463.

References

Worked examples

Example 1 — a first encounter with Jens Christian Refsgaard

Start with the simplest possible case. Write down what Jens Christian Refsgaard claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Jens Christian Refsgaard before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Jens Christian Refsgaard ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Jens Christian Refsgaard

In research: Jens Christian Refsgaard appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Jens Christian Refsgaard in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Jens Christian Refsgaard is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hydrologists, Living people, Technical University of Denmark alumni, so understanding it makes those chapters shorter.
In everyday life: Look for Jens Christian Refsgaard outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Jens Christian Refsgaard in 20 minutes

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Frequently asked questions

What is Jens Christian Refsgaard in simple terms?

Jens Christian Refsgaard is a hydrologist and academic. He is an emeritus professor at the Geological Survey of Denmark and Greenland.

Why does Jens Christian Refsgaard matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Jens Christian Refsgaard?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Jens Christian Refsgaard.