S.R. Fassnacht's Research - Colorado State University
ABSTRACTS from various papers
Study Sites ,
former work: sediment research
- Hydrologic Modelling
- Develop routines for snow processes and data assimilation in hydrologic and soil-vegetation atmospheric transfer models (WATFLOOD, CLASS, USGS-PRMS)
- Derive snow water equivalent (SWE) estimates across various mountain watersheds in gridded format and assess gridding techniques in terms of snowpack volumes
- Combine gridded SWE data with remotely sensed snowcovered area maps as input to a hydrologic model for snowmelt streamflow estimation (Upper Colorado River basin)
- Use weather radar to predict snowfall quantities for distributed hydrologic modelling, to assess the snowpack properties and to predict snowmelt streamflow (SW Ontario watersheds)
- Remote Sensing and Spatial Data
- AVHRR and TM imagery processing for snow-covered area (SCA) estimation with commercial information systems and in-house software
- GOES imagery analysis for SCA estimation and cloud-cover investigation
- RADARSAT imagery for soil moisture analysis
- Ground based weather radar data interpolation and analysis
- Field and Laboratory Studies
- Snow surveying and soil moisture sampling (with Environment Canada)
- Develop a snow sampling program for research and education
- Design, construct, test a laboratory assembly to measure fresh snow characteristics
- local snow sampling
- Runoff Forecasting and Hydrologic Modelling - emphasizing Snow and Winter Processes
- The overall goal is to improve runoff forecasting for water resources managers and other water users, in order to know how much water is in system and to better allocate resources.
- There are two main foci for modelling. Hydrological modelling efforts use both conceptual or index models and physically-based models to simulate state variables and streamflow.
The first focus is to improve the representation of snow and winter processes in models, for more accurate simulation. The second focus is to incorporate these lessons learned from these models
into simpler spatial runoff models.
- The existing runoff models use point data and spatial models are being developed to use distributed snowpack data.
- Hydrological Data Issues: Spatial Data and Remote Sensing
- The different model types use a variety of data and thus spatial analysis and commercial information systems are important components prior to modelling. For example, conceptual models use temperature and precipitation
data (and at times net radiation), while physically based models use radiation (long and short wave), pressure, humidity and wind data.
- These spatial data are being further developed for use in forecast models, as well as for evaluation of hydrological models. Others research are using these data to evaluate atmospheric models,
and remotely sensed precipitation estimates. These data include snow water equivalent and snow covered area.
- Field Studies
- There exists a good understanding of the physics behind most snow and winter hydrological processes. However, this understanding has not always been translated into
a relationship that can be used for modelling. Fieldwork will build the knowledge-base to better understand the processes and how to incorporate the understanding
- Experience from fieldwork will supplement data mining efforts. There are numerous existing datasets that are very comprehensive. These datasets are being explored to provide additional information.
Fieldwork will provide the hands on training to understand the datasets, and to collect additional information.
- Field studies will investigate lesser understood processes and will support other research efforts.
SEDIMENT TRANSPORT AND CHANNEL STABILITY
From 1991 to 1994, I was involved in the Northern Oil and Gas Action Program (NOGAP) in the Mackenzie River Delta, NWT, Canada.
This Environment Canada multi-disciplinary project examined the hydrologic and sediment regime of the Mackenzie Delta area to
provide an understanding required for environmental assessment and engineering design of future oil and gas infrastructure.
My involvement entailed:
- the application of a hydraulic flow model (ONE-D),
- bathymetric data were collected for the model
- methodologies were developed to improve vertical control for cross-sectional data
- systematic calibration of the model using geomorphological channel characteristics
- the development of a
multi-channel suspended sediment transport model (FOSH-MC) ,
- model linkage of an advection-dispersion sediment model and an hydraulic model to consider network sediment movement
- flow modelling to establish a
suspended sediment sampling schedule
- process investigations to understand sedimentation/erosion activity at channel bi(tri)furcations
- initial application to the Slave River Delta, NWT
- the investigation of channel stability at three locations.
- examine channel dynamics and/or stability at potential pipeline crossings
- investigate channel stability at an anomalous 'scour hole' in the
East Channel (Mackenzie Delta) .
Upstream of this location, the channel is ~ 200 m wide and 5 m deep with a thalweg of ~12 m.
At the 'scour hole', the channel deepens to 30 m. There is spherical (3-D) flow in the area of the hole.
This flow appears to be maintaining the hole. The origin of the hole is unknown, but likely cryospheric.
Steven DOT Fassnacht AT colostate DOT edu
Last update: SRF, 2011-02-18