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A Quality Assessment Tool for Nonstationary Water Levels in the Transition between Coastal and Hydrological Regimes

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Storage:	The size of this resource is 642.1 KB
Created:	Aug 24, 2023 at 6:56 p.m.
Last updated:	Oct 23, 2023 at 7:10 p.m.
Citation:	See how to cite this resource

Sharing Status:	Private (Accessible via direct link sharing)
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Abstract

Correct water level data is critical for navigation, flood predictions, and the general management of communities and ecosystems located near waterways. However, errors may arise from the instruments themselves, problems during deployment/data collection, or from post-processing and the ongoing management of historical records. While some error is unavoidable, acceptable errors can greatly vary and may require a variety of different types of quality assurances. For water level data from coastal gauges, quality assurance has traditionally used stationary approaches and assumes water levels are controlled by tides. Thus, quality assurance that can account for other trends through time (e.g., sea level rise) or intermittent events (e.g., storm surges, river discharge) are needed. While observational studies may have some level of quality assurance, the exact steps are rarely detailed.
Here, we detail a nonstationary quality assurance method that identifies and removes poor data and finds potential datum changes, adjusting the data to one continuous datum. The method is design for bulk processing of multiple timeseries and, for each one, produces a corrected hourly timeseries. In the sections below we detail our assumptions, preliminary data formatting, the data analysis process—which includes developing the buddy gauge timeseries, datum corrections, and bad data flags—and closes with identifying further changes that could be implemented in future versions.

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Coverage

Spatial

Coordinate System/Geographic Projection:

WGS 84 EPSG:4326

Coordinate Units:

Decimal degrees

Place/Area Name:

Sacramento-San Joaquin Delta and San Francisco Bay

North Latitude

38.7552°

East Longitude

-120.6189°

South Latitude

37.2139°

West Longitude

-123.6292°

Temporal

Start Date:
End Date:

Content

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Credits

Funding Agencies

This resource was created using funding from the following sources:

Agency Name	Award Title	Award Number
California Delta Stewardship Council		DSC- 21024

How to Cite

Dykstra, S. L., H. Baranes, S. A. Talke, D. A. Jay (2023). A Quality Assessment Tool for Nonstationary Water Levels in the Transition between Coastal and Hydrological Regimes, HydroShare, http://www.hydroshare.org/resource/47505deb95cc4df08a9de4d1e1641f71

This resource is shared under the Creative Commons Attribution CC BY.

http://creativecommons.org/licenses/by/4.0/

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