Article
Geography, Physical
Lise Devreux, Margot Chapuis, Barbara Belletti
Summary: This study demonstrates the usefulness of combining quantitative indices to evaluate restoration success in braided rivers. The results show that restoration operations can improve the active channel width and morphological pattern of braided rivers.
Article
Engineering, Aerospace
Jacques Verron, Pascal Bonnefond, Ole Andersen, Fabrice Ardhuin, Muriel Berge-Nguyen, Suchandra Bhowmick, Denis Blumstein, Francois Boy, Laurent Brodeau, Jean-Francois Cretaux, Mei Ling Dabat, Gerald Dibarboure, Sara Fleury, Florent Garnier, Lionel Gourdeau, Karen Marks, Nadege Queruel, David Sandwell, Walter H. F. Smith, E. D. Zaron
Summary: The CNES/ISRO altimetric satellite SARAL/AltiKa, launched in February 2013, has provided valuable data for various scientific and operational applications. Despite the drift in the satellite’s orbit since July 2016, the specific contributions and innovations related to the use of the Ka-band have become increasingly prominent. The advantages of the Ka-band include reduced ionosphere effects and better resolution, but there are drawbacks such as attenuation during rain. This study aims to highlight the advancements of the Ka-band and its potential for future missions.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Engineering, Civil
Michal Halicki, Tomasz Niedzielski
Summary: This study assesses the accuracy of water level measurements by the Sentinel-3A altimetry at virtual stations along Polish rivers. The results show that the root mean square error ranges from 0.12 to 0.44 m, with a mean value of 0.22 m. The Nash-Sutcliffe efficiency varies between 0.40 and 0.98, with a mean value of 0.84. It is found that river width and land cover do not have an impact on the performance of the altimetric measurements, but complex river channel morphology and unfavorable geographical setting may affect the accuracy.
JOURNAL OF HYDROLOGY
(2022)
Article
Oceanography
Zachary K. Erickson, Erik Fields, Leah Johnson, Andrew F. Thompson, Lilian A. Dove, Eric D'Asaro, David A. Siegel
Summary: Mesoscale eddies are a significant source of spatial variability in the surface ocean and have a major impact on the marine carbon cycle. This study compares satellite altimetry measurements with in situ observations to validate the use of altimetry for locating and tracking eddies. The results show over 90% agreement between altimetry metrics and in situ estimates, indicating that current satellite altimetry is sufficiently accurate for understanding the spatial representation of mesoscale eddies, even relatively small ones.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Review
Oceanography
Naheem Adebisi, Abdul-Lateef Balogun, Teh Hee Min, Abdulwaheed Tella
Summary: This study systematically reviewed the current advances in estimating sea level change, including trends in observation systems, radar technology, satellite altimetry, and the role of emerging spatial data science concepts and processing workflows. The findings suggest that tide gauges remain the best approach for long-term coastal sea level study, while satellite altimetry is suitable for global and regional scales.
OCEAN & COASTAL MANAGEMENT
(2021)
Article
Meteorology & Atmospheric Sciences
Hisham Eldardiry, Faisal Hossain, Margaret Srinivasan, Vardis Tsontos
Summary: For nearly three decades, satellite nadir altimeters have been providing crucial information for understanding the dynamics of oceans and inland waters. This review paper highlights the successful applications of altimeter data in addressing key societal problems, demonstrating the value of these missions to a diverse user community. The study shows the progress in utilizing altimeter observations and bridging the gap between data availability and their actual uptake. The findings aim to promote the adoption of future satellite missions, such as the Surface Water and Ocean Topography mission.
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2022)
Article
Engineering, Civil
Michal Halicki, Christian Schwatke, Tomasz Niedzielski
Summary: This study investigates the bias of Sentinel-3 altimetry measurements over rivers caused by satellite ground track shift and associated river slope. The study finds that the measured heights over virtual stations correspond to different locations on the river due to track shift. By using two correction approaches, the accuracy of water level data is improved by 25%.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Jaclyn Gehring, Bhavya Duvvuri, Edward Beighley
Summary: This study presents a method for estimating river discharge using satellite data and river characteristics, and improves the estimation accuracy by optimizing parameters. The results show that the optimized characteristics provide better discharge estimates than using mean discharge.
Article
Environmental Sciences
Baoliang Ren, Yunwen Pan, Xingyu Lin, Kejun Yang
Summary: This paper aims to investigate and analyze the bed surface roughness of braided rivers using statistical theory. Through experiments and data collection, the correlations between discharge, bedload transport rate, bed morphology, and bed elevation are explored. The results show that the morphological active width increases with increasing discharge, and there is a significant correlation between bedload transport rate and morphological active width. The elevation probability distribution exhibits negative skewness and leptokurtic distribution, and the bed elevation has significant variability and anisotropy. Moreover, the correlation between dimensionless sill, correlation length, and bedload transport rate is highly significant, which can serve as a reliable factor for predicting bedload transport rate.
Article
Environmental Sciences
Yuanyuan Yang, Wei Feng, Min Zhong, Dapeng Mu, Yanli Yao
Summary: Monitoring sea level changes and exploring their causes are important for predicting future climate change and sustainable development. This study investigates the basin-scale sea level budget using multiple sets of satellite data, finding that sea level rises significantly in certain ocean basins, with ocean mass being the main contributing factor and thermal expansion also playing a role.
Review
Environmental Sciences
Lei Yang, Lina Lin, Long Fan, Na Liu, Lingyong Huang, Yongsheng Xu, Stelios P. Mertikas, Yongjun Jia, Mingsen Lin
Summary: Scientometric reviews using computational and visual analytical approaches were conducted to examine the research trends and areas of concentration in the field of satellite altimetry. The findings revealed that significant changes have occurred in satellite altimetry research over the past 50 years, with major contributions from the United States, France, China, England, and Germany. There is a clear link between technological advancements and research trends in this field, with wide swath altimetry, GNSS-reflectometry, laser altimetry, terrestrial hydrology, and deep learning being among the most frontier study subjects. This research provides a comprehensive understanding of the overall development and research front in the field of satellite altimetry.
Review
Environmental Sciences
Fabrice Papa, Frederic Frappart
Summary: Surface water storage (SWS) is the freshwater stored in rivers/wetlands/floodplains/lakes, which plays a key role in the water cycle and land surface hydrology. It is challenging to measure SWS variations accurately, but satellite observations provide great opportunities for this. The launch of the SWOT satellite mission in 2022 will offer unprecedented spatial resolution for direct estimates of SWS variations, contributing to a better understanding of large-scale hydrological processes.
Article
Oceanography
Edward D. Zaron
Summary: Using satellite altimeter data, the frequency spectrum and tidal variations of sea level have been studied, revealing distinct peaks of high-frequency tidal signals and the characteristics of tidal continuum.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Environmental Sciences
D. Panici
Summary: The study investigates the motion of large wood in rivers and suggests that the trajectory of the wood is influenced by factors such as flow conditions and release locations. Results indicate that large wood tends to follow preferential patterns along the channel after a transient motion. The study proposes a new model based on acceleration induced by hydrodynamic actions for predicting the transport of large wood, paving the way for comprehensive models in full-scale applications.
WATER RESOURCES RESEARCH
(2021)
Review
Environmental Sciences
Margaret Srinivasan, Vardis Tsontos
Summary: More than 30 years of satellite altimeter missions have provided key data for research purposes and operational applications, such as ocean circulation, ocean heat content, climate change impacts, and weather forecasting. These missions have been valuable resources for shipping, fishing, and offshore operations, as well as decision makers in coastal, water resources, and disaster management fields. The precise measurements of ocean surface topography obtained from these missions have enabled better assessments of storms, waves, and sea level rise impacts on coastal communities and infrastructure.
Article
Engineering, Multidisciplinary
K. Larnier, J. Monnier, P. -A. Garambois, J. Verley
Summary: An inverse method utilizing satellite altimetry to estimate river discharge has been developed and assessed, showing accurate inference of river discharge and bathymetry profiles. The hierarchical flow model combined with variational data assimilation provides valuable insights for real-time discharge estimations in a computationally efficient manner.
INVERSE PROBLEMS IN SCIENCE AND ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Jerome Monnier, Jiamin Zhu
Summary: This method combines surface measurements and thickness measurements to infer bed topography beneath glaciers using a non-isothermal Reduced Uncertainty version of the Shallow Ice Approximation equation. Through the use of neural networks and data assimilation processes, the method demonstrates robustness and applicability in estimating bed elevation under glaciers.
COMPUTATIONAL GEOSCIENCES
(2021)
Article
Geochemistry & Geophysics
Charlotte M. Emery, Adrien Paris, Sylvain Biancamaria, Aaron Boone, Stephane Calmant, Pierre-Andre Garambois, Joecilia Santos Da Silva, Cedric H. David
Summary: In this study, satellite altimetry missions were used to estimate river discharge, and the data from these missions were assimilated to improve the accuracy of the simulated discharge. The results show that assimilating products with a dense spatial coverage can lead to better accuracy, and the best results are obtained when both products are assimilated.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Mathematics, Applied
T. Malou, J. Monnier
Summary: The estimation of the background error covariance operator in data assimilation (DA) is a classical and open topic. This study proposes a method to derive covariance operators from the underlying equations and models them using Green's kernels. The physically-derived operators show better accuracy and faster convergence compared to empirical operators.
Review
Geochemistry & Geophysics
Fabrice Papa, Jean-Francois Cretaux, Manuela Grippa, Elodie Robert, Mark Trigg, Raphael M. Tshimanga, Benjamin Kitambo, Adrien Paris, Andrew Carr, Ayan Santos Fleischmann, Mathilde de Fleury, Paul Gerard Gbetkom, Beatriz Calmettes, Stephane Calmant
Summary: The African continent hosts some of the largest freshwater systems worldwide, and its hydrology has been less studied. Remote sensing technology plays a crucial role in monitoring and managing Africa's water resources, with future satellite missions offering more opportunities.
SURVEYS IN GEOPHYSICS
(2023)
Correction
Geochemistry & Geophysics
Fabrice Papa, Jean-Francois Cretaux, Manuela Grippa, Elodie Robert, Mark Trigg, Raphael M. Tshimanga, Benjamin Kitambo, Adrien Paris, Andrew Carr, Ayan Santos Fleischmann, Mathilde de Fleury, Paul Gerard Gbetkom, Beatriz Calmettes, Stephane Calmant
SURVEYS IN GEOPHYSICS
(2023)
Article
Water Resources
V Dos Santos, R. A. Juca Oliveira, P. Datok, S. Sauvage, A. Paris, M. Gosset, J. M. Sanchez-Perez
Summary: This study compares different satellite-based precipitation products for a hydrological model in the Congo River Basin. The findings show that satellite-only products tend to overestimate rainfall season peaks, while products that consider gauge calibration exhibit better agreement. The hydrological model is able to reproduce precipitation characteristics, with gauge-adjusted satellite products performing better than those without adjustment.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2022)
Article
Engineering, Civil
Victor Pellet, Filipe Aires, Dai Yamazaki, Xudong Zhou, Adrien Paris
Summary: This paper presents a new approach for mapping river discharge based on satellite observation and water budget balance. The method corrects satellite estimates using in situ measurements and balances the water budget at the grid level. The spatially continuous river discharge shows good agreement with altimetric water surface level and surface water extent satellite estimate. The method has the benefit of investigating model differences and describing extreme events.
JOURNAL OF HYDROLOGY
(2022)
Article
Geochemistry & Geophysics
Marielle Gosset, Pauline A. Dibi-Anoh, Guy Schumann, Renaud Hostache, Adrien Paris, Eric-Pascal Zahiri, Modeste Kacou, Laetitia Gal
Summary: This article reviews the latest technology in using space-borne observations to analyze extreme rainfall and flood events in Africa. It discusses how satellite data can help understand the genesis and impacts of these events, monitor their evolution, and improve early warning and population protection. Major flood events in Niger, Mozambique, Central African Republic, and Ivory Coast are reanalyzed using satellite information.
SURVEYS IN GEOPHYSICS
(2023)
Article
Geochemistry & Geophysics
Angelica Tarpanelli, Adrien Paris, Arthur W. Sichangi, Fiachra O'Loughlin, Fabrice Papa
Summary: This paper provides a review of methods for estimating river discharge using satellite data, with a particular focus on their role in climate change monitoring. It highlights the relevance, limitations, and advantages of these methods in African basins.
SURVEYS IN GEOPHYSICS
(2023)
Article
Environmental Sciences
Mohammad J. Tourian, Fabrice Papa, Omid Elmi, Nico Sneeuw, Benjamin Kitambo, Raphael M. Tshimanga, Adrien Paris, Stephane Calmant
Summary: Water storage-discharge analysis reveals that the total drainable water storage of the Congo Basin ranges from 476-502 km(3), with uneven distribution and a significant portion in the southern sub-basins. It would take approximately 4.3 months to completely drain the water storage. The Congo Basin plays a vital role in global biodiversity, as well as water and carbon cycles, but its freshwater availability and distribution are still relatively unknown.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Water Resources
Abubakar Haruna, Pierre-Andre Garambois, Helene Roux, Pierre Javelle, Maxime Jay-Allemand
Summary: This study compares the performance of three hydrological models of different complexities in Mediterranean flash flood modeling. The results reveal that the models capture the behavior of the catchment differently, contributing to improved relevance of the models. Evaluation using global sensitivity analysis, calibration/validation, and signature comparison demonstrates that the process-based MARINE model outperforms the continuous hourly models in terms of flood peak and timing at the event scale.
Article
Geosciences, Multidisciplinary
Leo Pujol, Pierre-Andre Garambois, Jerome Monnier
Summary: This study introduces a novel multidimensional hydraulic-hydrological numerical model with variational data assimilation capabilities, validated on cases of increasing complexity. By assimilating multiple observations of flow signatures, accurate inferences of multi-variate and spatially distributed parameters can be obtained, demonstrating the possibility for information feedback towards upstream hydrological catchments.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Geosciences, Multidisciplinary
Benjamin Kitambo, Fabrice Papa, Adrien Paris, Raphael M. Tshimanga, Stephane Calmant, Ayan Santos Fleischmann, Frederic Frappart, Melanie Becker, Mohammad J. Tourian, Catherine Prigent, Johary Andriambeloson
Summary: This study analyzes a large record of in situ and satellite-derived observations to characterize the hydroclimatic characteristics of the Congo River basin. The results provide valuable information for hydrological modeling and studying hydrological processes in the region.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Judith Eeckman, Helene Roux, Audrey Douinot, Bertrand Bonan, Clement Albergel
Summary: The latest developments of the MARINE hydrological model, including improvements in subsurface water transfer based on soil saturation degree and division of soil columns into two layers, have been explored in this work. Through comparisons with various products and measurements, it was found that the new models provide more accurate simulation of soil moisture during flash flood events compared to the base model.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2021)
