Preprints
Filtering by Subject: Hydrology
A Stability Analysis of Neural Networks and Its Application to Tsunami Early Warning
Published: 2023-05-14
Subjects: Geophysics and Seismology, Hydrology, Numerical Analysis and Computation
Neural networks (NNs) enable precise modeling of complicated geophysical phenomena but are sensitive to small input changes. In this work, we present a new method for analyzing this instability in NNs. We focus our analysis on adversarial examples, test-time inputs with carefully-crafted human-imperceptible perturbations that expose the worst-case instability in a model's predictions. Our [...]
A high-resolution temporal framework to understand the reach-scale controls on wood budgeting
Published: 2023-04-07
Subjects: Environmental Monitoring, Geomorphology, Hydrology, Physical and Environmental Geography, Remote Sensing
Large active channels usually store more wood than channels with a narrow flow because of the availability of large unvegetated bars for wood deposition and inner functioning that usually supplies more wood through channel shifting. However, the dynamics of the wood supply (wood input, output, or stability) can vary substantially over time and the drivers are largely unknown. To explore them, we [...]
Revisiting the Climate Narrative
Published: 2023-04-06
Subjects: Agriculture, Climate, Ecology and Evolutionary Biology, Environmental Engineering, Environmental Studies, Food Science, Forest Management, Hydrology, Natural Resources and Conservation, Natural Resources Management and Policy, Oil, Gas, and Energy, Other Environmental Sciences, Soil Science, Sustainability, Water Resource Management
The rise in atmospheric carbon dioxide is chiefly tied to land stewardship. Farmers and loggers have removed the plants that, until the industrial era, kept the soil fungi alive, kept soil emissions nearby by breaking the wind, and soaked those up. The result is plumes of carbon dioxide. Putting plants back in would curb these emissions. Farmers and loggers could address biodiversity loss [...]
Stream Thermalscape Scenarios for British Columbia, Canada
Published: 2023-03-21
Subjects: Fresh Water Studies, Hydrology, Natural Resources and Conservation, Water Resource Management
Water temperature is a key feature of freshwater ecosystems but comprehensive datasets are severely lacking, a limiting factor in research and management of freshwater species and habitats. An existing statistical stream temperature model developed for British Columbia, Canada, was refit to predict August mean stream temperatures, a common index of stream thermal regime also used in thermalscapes [...]
Large variation in Mekong river plastic transport between wet and dry season
Published: 2023-02-27
Subjects: Earth Sciences, Environmental Monitoring, Environmental Sciences, Hydrology, Water Resource Management
Plastic pollution in rivers is of increased global concern. Rivers act both as pathways for land-based plastic waste into the ocean, and as plastic reservoirs for long-term retention. Reliable observations are key to designing, optimizing and evaluating strategies to prevent and reduce plastic pollution. Several measurement methods have been developed to quantify macroplastic ($>$0.5 cm) storage [...]
Extrapolation-based regionalized re-evaluation of the global estuarine surface area
Published: 2023-02-24
Subjects: Biogeochemistry, Earth Sciences, Geomorphology, Hydrology
At the interface between the continental and oceanic domains, estuaries are essential components of the land–ocean aquatic continuum. These coastal ecosystems play a significant role in biogeochemical cycles, as they transform and export large amounts of terrigenous carbon and nutrients from rivers to marine waters. Because of this intense biogeochemical processing, they are significant [...]
Considerable gaps in our global knowledge of potential groundwater accessibility
Published: 2023-02-11
Subjects: Geology, Hydrology, Sustainability, Water Resource Management
At what depth groundwater can be found below the land surface is key to understanding whether it is potentially accessible to ecosystems and humans, or what role it plays in the water cycle. Knowledge of ground-water table depth (WTD) exists at regional scales in many places, but a bottom-up knowledge aggregation to obtain a coherent global picture is exceptionally challenging. Uncertainty in [...]
Changes in water age during dry-down of a non-perennial stream
Published: 2023-02-10
Subjects: Hydrology
Non-perennial streams, which lack year-round flow, are widespread globally. Identifying the sources of water that sustain flow in non-perennial streams is necessary to understand their potential impacts on downstream water resources, and guide water policy and management. Here, we used water isotopes (δ18O and δ2H) and two different modeling approaches to investigate the spatiotemporal dynamics [...]
Soil moisture modulation of midlatitude heat waves
Published: 2023-02-10
Subjects: Atmospheric Sciences, Climate, Earth Sciences, Hydrology, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics
Heat waves are broadly expected to increase in severity and frequency under climate change. Case studies highlight a number of physical mechanisms that play a role in present-day heat waves, which typically occur during a coalescence of anomalous atmospheric and land surface conditions. However, a unified model of heat wave physics is lacking, primarily owing to difficulty in disentangling the [...]
Comparing Well and Geophysical Data for Temperature Monitoring within a Bayesian Experimental Design Framework
Published: 2023-01-24
Subjects: Earth Sciences, Hydrology, Physical Sciences and Mathematics, Water Resource Management
Temperature logs are an important tool in the geothermal industry. Temperature measurements from boreholes are used for exploration, system design, and monitoring. The number of observations, however, is not always sufficient to fully determine the temperature field or explore the entire parameter space of interest. Drilling in the best locations is still difficult and expensive. It is therefore [...]
Dynamic rainfall thresholds for landslide early warning in Progo Catchment, Java, Indonesia
Published: 2023-01-20
Subjects: Applied Statistics, Earth Sciences, Geomorphology, Hydrology, Meteorology
This study aims to derive and evaluate new empirical rainfall thresholds as the basis for landslide early warning in Progo Catchment, Indonesia, using high-resolution rainfall datasets. Although attempts have been made to determine such thresholds for regions in Indonesia, they used coarse-resolution data and fixed rainfall duration that might not reflect the characteristics of rainfall events [...]
STICr: An open-source package and workflow for Stream Temperature, Intermittency, and Conductivity (STIC) data
Published: 2023-01-13
Subjects: Hydrology
Non-perennial streams constitute over half the world’s stream miles but are not commonly included in national streamflow monitoring networks. Stream Temperature, Intermittency, and Conductivity (STIC) loggers are a widely used tool for studying non-perennial streams because they provide a relatively inexpensive and robust method for characterizing flow presence or absence. However, raw data [...]
Improving Shoreline Forecasting Models with Multi-Objective Genetic Programming
Published: 2023-01-10
Subjects: Artificial Intelligence and Robotics, Climate, Environmental Engineering, Environmental Monitoring, Geomorphology, Hydrology, Numerical Analysis and Scientific Computing, Oceanography, Sedimentology, Statistical Models
Given the current context of climate change and increasing population densities at coastal zones, there is an increasing need to be able to predict the development of our coasts. Recent advances in artificial intelligence allow for automatic analysis of observational data. This work makes use of Symbolic Regression, a type of Machine Learning algorithm, to evolve interpretable shoreline [...]
Shyft and Rasputin: a toolbox for hydrologic simulations on triangular irregular networks
Published: 2023-01-07
Subjects: Hydrology
Terrain topography controls insolation variations at catchment scale. This effects are known to be important in cold and mountainous regions due to high diurnal and seasonal variability in incoming radiation. However, meteorological data in such areas lacks accuracy due to sparse station network and coarse re-analysis grids. Simulation tools that model hydrologic processes at local scales require [...]
Blockchain Applications and Opportunities for Water Resources and Hydrology: A Systematic Review
Published: 2022-12-31
Subjects: Databases and Information Systems, Hydrology
Although blockchain technology was first applied for peer-to-peer financial transactions, it has been used for the digitalization of physical asset management and data management processes in many areas in the industry and academia, including the water domain. Its potential as an immutable data storage system and smart contract integration has provided a plethora of use cases and utility in the [...]