Synchronous and Cross Scale Hydrometeorological Controls over Streamflow
Abstract
Different hydrometeorological variables interact with streamflow at different timescales with varying levels of dominance. This interaction can be synchronous or asynchronous under different timescales. Understanding the timescale, lag and strength of the interaction is key to model development and hydrological forecasts. We employed information theoretic concepts that capture nonlinear interactions to reveal the different time lags and strength of interactions for multiple timescales across a number of intensively monitored watersheds in the US. The results suggest daily streamflow is predominantly controlled by synchronous daily precipitation, while hourly streamflow is controlled by a distinctly lagged hourly precipitation. Generally, the influence of precipitation's dominance over hourly streamflow decreases when it is aggregated to coarser timescales. In addition, the strength and timing of these interactions varies across watersheds, particularly on the hourly scale. By expanding these preliminary analyses to additional hydrometeorological variables and watersheds, we aim to understand the roles these variables play in streamflow dynamics across multiple timescales.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMH101...07C
- Keywords:
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- 1804 Catchment;
- HYDROLOGY;
- 1847 Modeling;
- HYDROLOGY;
- 1855 Remote sensing;
- HYDROLOGY;
- 1874 Ungaged basins;
- HYDROLOGY