1 / 15

CBWM Phase 5 Status Report

CBWM Phase 5 Status Report. Modeling Subcommittee Meeting October 2, 2002. Overview. Model structure and responsibilities Model segmentation Precipitation modeling. Model Responsibilities. Source data /p50X/pp/data/ CBP External transfer module (scripts) /p50X/pp/etm/ CBP

cera
Télécharger la présentation

CBWM Phase 5 Status Report

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CBWMPhase 5 Status Report Modeling Subcommittee Meeting October 2, 2002

  2. Overview • Model structure and responsibilities • Model segmentation • Precipitation modeling

  3. Model Responsibilities • Source data /p50X/pp/data/CBP • External transfer module (scripts) /p50X/pp/etm/CBP • Model parameters /p50X/pp/lib/catalogs/modules/USGS • Watershed-reach connection files /p50X/pp/lib/connect/USGS

  4. Segmentation • Downstream ID has been added to all reaches in the Chesapeake Bay Watershed except for those draining directly to the estuary. (Their ID is zero.) • Working on attributing the southern Virginia watersheds with DSID.

  5. Segmentation • Reaches and watersheds have been reconnected so that we know what streams are in what watersheds. • Working on transferring the mean annual discharge attributes to the watersheds so we have the flow attribute in the names.

  6. Precipitation Modeling • Objectives: • Spatially distribute recorded point-precipitation data to provide high-resolution, low-bias areal precipitation time-series data at an hourly time step for use as input to hydrologic models. • Provide areal precipitation time-series data that can be used in a consistent manner over a range of spatial scales.

  7. Precipitation Modeling: Scope • Data used to achieve these objectives are daily and hourly recorded precipitation totals from climate stations within the study area, including a 25-km buffer around the area boundary. • Precipitation data are from the period 1985 through 2000.

  8. Precipitation Modeling: Scope • 487 daily-data stations • 192 hourly-data stations

  9. Precipitation Modeling: Scope • Daily precipitation data are simulated for 10-km square grid cells throughout the study area. • Daily precipitation for each FIPS2 area within the study area is computed based on time-series data from grid cells within each FIPS2 area.

  10. xyz Methodology • Multiple linear regression (MLR) equations are developed for daily precipitation (p) in each of six sub-regions using independent variables x, y, and z from climate stations in each sub-region. • The general form of the MLR equation is:

  11. Hourly Disaggregation • Simulated daily precipitation data are disaggregated into hourly data using: • recorded hourly precipitation from the nearest climate station, or • Mean-hourly precipitation by month and weather type. • Simulated daily p totals are preserved during disaggregation.

  12. Mean-hourly rainfall (Feb)

  13. Example Data • 10x10km daily data • January, 1990 • mm/day

  14. Future Plans • Complete trial Patuxent run • Complete F-tables • Begin PEST implementation • Continue investigating inclusion of estimates of ground-water residence times

  15. “on the graph paper”

More Related