View Proposal #388
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| ID | 388 |
|---|---|
| First Name | Morgan |
| Last Name | Fonley |
| Institution | University of Iowa |
| Speaker Category | graduate student |
| Title of Talk | Amplification and damping of an oscillating streamflow signal in a river network |
| Abstract | When river flow is observed under dry conditions (such as late summer), a daily fluctuation can be seen. Without the addition of precipitation, the source of these fluctuations is understood to be evapotranspiration of water from the riparian zone of trees near the river network. The flow at any point in the river network exhibits a time delay between the time of maximal evaporation (around midday) and the minimal streamflow. Several hypotheses suggest reasons for this time delay including different methods by which water moves through the soil. An alternative hypothesis is that the time delay instead comes from constructive and destructive interference that occurs when the oscillating flows of river links undergo different phase shifts and combine their signals. In this way, the flow at a downstream river link can be amplified or damped. I present an analytic solution to the transport equation, a linear ordinary differential equation that can be used to determine the flow at any point in a river network when all hillslopes are assumed to have uniform parameters. I use this solution to demonstrate the extent of amplification or damping that can occur when different parameter values are varied. |
| Subject area(s) | |
| Suitable for undergraduates? | Y |
| Day Preference | SaturdayMild |
| Computer Needed? | Y |
| Bringing a laptop? | N |
| Overhead Needed? | N |
| Software requests | Any Powerpoint or PDF viewer |
| Special Needs | |
| Date Submitted | 09/25/2014 |
| Year | 2014 |