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Flow Connectivity and Sediment Transport Modeling in Flashy Ephemeral Channel Networks

In large river systems such as the Rio Grande, sediment influx and water delivery from ephemeral streams is difficult to quantify and track. Yet is has major management implications to such diverse issues as reservoir sedimentation, sediment plugs and avulsions, flooding, and additions to streamflow. In the Arroyo de los Pinos watershed, one such ephemeral system, we have been monitoring discharge at 18 different points for two years in an effort to quantify water and sediment delivery from the ephemeral channels. The data collected in the past, present, and future will allow for a better understanding of how the network connects across a range of precipitation intensities and magnitudes, and how these interactions control water and sediment delivery to the watershed outlet. Preliminary data support the prevailing understanding that the primary controls on local runoff generation are rainfall intensity, lithology, and sub-basin size (Richards, 2020).