Delta Basin

The Delta Basin is a square flume measuring approximately 5 meters by 5 meters, and is 0.61 meters deep. The exact experimental configuration may vary depending on the scientific objectives - the specific scheme at right represents that for the DB03-1 and DB03-2 experiments.

A mix of sediment and water are introduced at a single infeed point in one corner of the basin. This produces a radially symetrical delta-like deposit. A syphon-based ocean controller at the opposite corner allows for precise base-level manipulation, and specifically for the creation of accomodation space via a slow base-level rise.

Data

Topography on the fluvial surface is measured using a laser-line system: laser lines (three are shown in the schematic) are projected onto the fluvial surface, and photographs taken at regular intervals by a camera on a fixed mount. 

Surface processes are recording using the same camera in time-lapse mode.

Stratigraphy is recorded by slicing the resulting deposit and photographing the faces (with the same camera). "Peels" are also taken of the faces.

By using the same camera in the same position, image data from all three data sets may be directly compared. 

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DB03-1 Corrected surface images
Images of the fluvial surface taken during the DB03-1 High Frequency Topography. See project description for details. The original images were taken every 15 seconds of run time and stored in Nikon's NEF format. These images have been corrected (for lens distortion and perspective) using Andromeda Software's Lendsoc Photoshop filter, and saved in JPG format. Images are stored in folders by calendar date. The file names are of the format "Ryyyy-mm-dd-hhmmss.jpg" where "R" stands for "run" (vs "T" in other experiment images for "topography") - note that the date/time is calendar not runtime - images with the runtime in the file name are elsewhere in the archive.

DB03-1 Deposit Face Images
Images of the DB03-1 Deposit stratigraphy. The deposit was sliced at the 1.5, 1.75, and 2.0 meter downstream transects, corresponding to the locations where surface topography measurements were taken. Another set of images is of a stream-wise face approximately at the center of the delta. Images are in Nikon's proprietary NEF format, and are uncorrected.

DB03-1 Elevation Data
These Excel workbooks contain fluvial surface elevation data from the DB03-1 experiment. See the readme. In the "cleaned_and_renamed" folder, the data have been cleaned up (redundant data removed, out-of-range data removed, worksheet names corrected, etc) but otherwise are unaltered. The "runtimetablefinal.xls" workbook has a table for convering the topo image file names (built from calendar time) into experiment run time. Data records pixels-above-bottom-of-image. Bottom-of-image is common to the topo images, surface images and deposit face images for correlation purposed. The data was created by analyzing the topo images (see project description) and establishing a weighted average elevation of the topo line at each point. Read the readme document for more information.

DB03-1 Topography Data with event data
This folder contains cleaned up elevation data from the DB03-1 experiment, plus aggradation and erosion event data. The main folder contains the elevation and event data workbooks: one Excel workbook per run day, and three sheets per workbook corresponding to the three topo lines, plus worksheets of event counts and durations. All elevation data is in pixels-above-bottom-of-image. The data was collected by analyzing images of laser lines (see project description) - note that the laser-line images were all corrected based on the callibration grid for the middle (x=1.75 meters) line, which may introduce minor errors in the data for the other two lines. In addition to the basic elevation data, the workbooks contain Event data (Aggradation and Erosion) for each day, plus the Excel macros that created the event data There are two workbooks with combined results - see the readme file.

DB03-2 Final Deposit Images
These images are coomposite images of the deposit. For each cross-stream transect, a series of overlapping images were taken, and these were stitched together to create these composits. The original images are elsewhere in this archive.