S. Munier, A. Polebitski, C. Brown, G. Belaud, D.P. Lettenmaier.

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Presentation transcript:

S. Munier, A. Polebitski, C. Brown, G. Belaud, D.P. Lettenmaier

Surface Water and Ocean Topography (SWOT) satellite mission SWOT will:  Provide a global inventory of all terrestrial surface water bodies (lakes, reservoirs, wetlands) whose surface area exceeds ~ 6 ha, and rivers whose width exceeds 100 m  Measure the storage change in resolved lakes, reservoirs, and wetlands, and the discharge of resolved rivers at subseasonal to annual time scales.

 SWOT and water resources management  Study case and methodology  SWOT data assimilation  Operational reservoir management

 To maintain minimum streamflows at the outlet, reservoir managers have to:  Predict the influence of difference factors  Decide when and how much water has to be released from the reservoir  Hydrology-Hydraulics-Reservoir modeling  For definition of dam releases  Depending on water demand, hydric state, available water in reservoirs  Main limitations of current approaches  Model approximations  Quality of datasets (data sparse regions, discontinuities, quality control, uniformity, delay)  Transboundary basins (data sharing) Use of remote sensing data: SWOT

 The SWOT mission: Surface Water and Ocean Topography  French/American mission, launch planned in 2020  2-D water elevation measurements over rivers (width: 100 m and more)  21 days repetitivity  Accuracy on water elevation: 10 cm on a 1 km x 1 km square  Questions:  How to integrate information from SWOT data into operational water management systems?  What are the performances of operational water management when only SWOT data are used in real time?  How to integrate information from SWOT data into operational water management systems?  What are the performances of operational water management when only SWOT data are used in real time?

 Climate dominated by the Western African monsoon  Large seasonal floodplains  used for crop, livestock, fishing  Selingue reservoir (2 x 10 9 m 3 ) used for hydropower and low flow sustainability => Minimum streamflow requirement at Kirango (300 km downstream) considered reach The upper Niger river basin Kirango

 Hydrological inflows: VIC  0.5 degree resolution, daily time step  Reservoir: water budget  Hydrological inputs from VIC  Min and max levels  Hydrodynamics: LISFLOOD-FP  Inputs from VIC and reservoir  1 km resolution, adaptive time step  Evaporative losses Meteo- rological forcings Downstream discharge Dam release

First experiment: evaluation of SWOT data assimilation SWOT data assimilation (DA) Corrupted forcings

Second experiment: operational reservoir management Routing model

 Ensemble members generation  VIC meteorological forcings are corrupted  Principal Component Analysis (decomposition into spatial and temporal modes)  Each mode corrupted with white noise (0.2 std)  Spatiotemporal consistency maintained first spatial mode

 Assimilation of SWOT water elevation  SWOT observations over a complete cycle (21 days)

 Assimilation of SWOT water elevation  SWOT observations over a complete cycle (21 days) Number of SWOT observation

 Effect of the assimilation on the downstream discharge (b) Local Ensemble Kalman Filter (a) Open loop (c) Local Ensemble Kalman Smoother (LEnKS)(d) LEnKS + Inflow Correction

 Minimum flow requirement: 50 m 3 /s  Need for water releases from the Selingue reservoir

 Model Predictive Control  Optimizes the releases to satisfy the downstream requirement  Allows to account for the flow propagation (about 25 days)  Use of a simplified routing model (lag-and-route)  Initialization using the updated discharge in the river reach (after SWOT data assimilation) Model Predictive Control

target discharge Munier et al. (2014)

 Effect of SWOT errors (random and bias)

 Conclusions  Modeling framework adapted to SWOT data assimilation and operational water management  Assimilation persistency high enough to overcome delays between SWOT measurements  Perspectives  Niger Inner Delta (complex hydrodynamic and data sparse region with high flood extent variations)  Multiple reservoir control (MPC well adapted)  Multiple reservoir objectives (e.g., hydropower)  Data latency and SWOT errors issues over smaller basins