Benefits of parsimonious representations of hydrological processes in Earth System Models
Abstract
The representation of hydrological processes in Earth System Models has improved dramatically over recent years. As a result, more realistic and higher resolution models have been developed, but consequently at the cost of higher computational demand as well as a larger number of parameters that have to be prescribed often from uncertain information. Higher complexity can make model diagnostics not a straightforward task due undesired high degree of parameter interactions and ultimately an inability to identify key controlling processes. Parsimonious models are powerful tools that can provide useful insight into dominant controls. They can also be rejected easier, which means we can better evaluate assumptions regarding important hydrologic processes. Here, we highlight the benefits of building and using parsimonious parameterizations of key hydrological processes which are ultimately targeted at Earth System Modeling applications. We present key steps in model development focusing on surface-subsurface interactions, in particular (1) on the representation of preferential flow of water in soils on chalk regions, (2) on the role of groundwater dynamics on soil moisture dynamics across a range of different soils, and (3) on the controlling aspects of vegetation on recharge in karst areas. In relation to above, we discuss the benefits of (i) using more complex models as benchmarks for the development of such parsimonious models, (ii) testing models using synthetic experiments in addition to real-world observations, and (iii) combining in-situ data and stepwise diagnostics approach for model development.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.H41B..02R
- Keywords:
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- 0430 Computational methods and data processing;
- BIOGEOSCIENCESDE: 1805 Computational hydrology;
- HYDROLOGYDE: 1846 Model calibration;
- HYDROLOGYDE: 1873 Uncertainty assessment;
- HYDROLOGY