Hydrogeodesy Training Session Approximately 15 attendees, Three seminars 1. Introduction to Hydrogeodesy 2. Introduction to Data Assimilation 3. Introduction to Earth Observations for Water Resources Management

1
Hydrogeodesy Training SessionApproximately 15
attendees, Three seminars 1. Introduction to
Hydrogeodesy2. Introduction to Data
Assimilation3. Introduction to Earth
Observations for Water Resources Management

• Participants mostly interested in obtaining
  models for groundwater calculations in their
  study sites. They asked practical questions on
  how to apply hydrogeodesy and data assimilation.
• Several people wanted numerical codes, but we
  suggested that conceptual understanding and
  theory needs to obtained first, followed by hands
  on learning.
• The main purpose of these seminars is to
  introduce the audience these concepts and then
  provide follow up to those truly interested in
  the applications.

2
Geodesy is the science of determining the
geometry, gravity field, and rotation of the
Earth, and their evolution in time.
The geodetic reference frame is crucial for all
Earth observations and has hight societal value.
Hydrogeodesy applies geodetic techniques to study
and monitor the (terrestrial) hydrology.
GRACE has contributed tremendously to our
knowledge about water cycle mass redistributions
from global down to 150 km spatial scales and
sub-monthly temporal scales.
GRACE data products show differences, depending
upon the groups developing them and producing
them community-vetted products are not (yet)
available.
InSAR and GPS provide information on groundwater
change GPS provides soil moisture and snow depth
3
Hydrogeodesy has the demonstrated potential to
support water management and help address the
growing water scarcity.
Obstacles
Hydrogeodesy data products are difficult to
understand and apply in disciplines outside of
geodesy, particularly hydrology.
Gaps in infrastructure need to be addressed.
Integrated Earth system models for assimilation
of hydrogeodetic observations are needed.
Integrated Earth system models for assimilation
of hydrogeodetic observations are needed.
Considerable need for capacity building both in
knowledge creation and use of knowledge by
decision makers.
User guides, science-policy/public interfaces
that provide easier access to hydrogeodesy
results.
4
Data Assimilation

• Data assimilation provides the initial conditions
  that produce the best possible model forecast.
• It must create an analysis consistent with the
  model numerics, dynamics, physics, and
  resolution.
• NWP provides the short-range forecast for the
  analysis by making a series of small corrections
  to that forecast based on new information from
  observations.
• Analyses is different for different models and
  will most likely differ from the best estimate of
  the true state of the atmosphere produced by a
  hand analysis.
• Observations are assimilated to correct each
  short-range forecast that serves as the basis for
  the next analysis, resulting in a series of small
  corrections to the model forecast.

5
The formal approach for data assimilation
analysis is to solve for the minimized
subspace(Xa-Xb) dx

• Where,
• dx is the subspace
• Xa is the forecast
• Xb is the background (initial) state.

6
NWP Prediction of future atmospheric states

• U(Sx,y,z, t1) U(Sx,y,z, t) wu x
  fU(Sx,y,z,t) - Uobs
• T (Sx,y,z, t1) T (Sx,y,z, t) wT x
  fT(Sx,y,z,t) - Tobs
• q(Sx,y,z, t1) q(Sx,y,z, t) wq x
  fq(Sx,y,z,t) - qobs
• U - wind direction and magnitude
• T - atmospheric temperature
• Q - atmospheric water vapor
• Sx,y,z - space dimensions
• t - time dimension
• Wu wT wq - assimilation weighting functions for
  U, T, q
• f - interpolation function

7
(No Transcript)
8
Marketing Toolkits

• International trends and developments in a GEO
  societal benefit area
• Promotion of earth observation applications
• How to get funding?
• Capacity building
• Disaster toolkit
• Crop modelling toolkit
• Water toolkit