Understanding, Characterizing, and Modeling Complex Hydrologic Systems
"The interplay of climate variability and change, global water crisis, and human impact on the water cycle pose the most significant challenge for hydrology today. Our inter-disciplinary research deals with Hydrocomplexity, the quantitative understanding and prediction of emergent patterns of form and function that arise from complex non-linear multi-scale interactions between soil, water, climate, vegetation and human systems, and how this understanding can be used for innovative solutions to water and sustainability challenges. We use deterministic and stochastic modeling, computer simulations, informatics, and field data and investigations for these studies".
Intensively managed landscapes, regions of significant land use change, serve as a cradle for economic prosperity. However, the intensity of change is responsible for unintended deterioration of our land and water environments. By understanding present day dynamics in the context of long-term co-evolution of the landscape, soil and biota, IML-CZO aims to support the assessment of short- and long-term resilience of the crucial ecological, hydrological and climatic services. An observational network of three sites in Illinois, Iowa, and Minnesota that capture the geological diversity of the low relief glaciated and tile-drained landscape will drive novel scientific and technological advances. IML-CZO will provide leadership in developing the next generation of work force and informing management strategies aimed at reducing the vulnerability of the system to present and emerging trends in human activities such as the expansion of bioenergy crops.
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A major challenge in critical zone science is to understand and predict the interaction between above- and below-ground ecohydrologic processes. One process that facilitates this connection is hydraulic redistribution, a phenomenon by which roots serve as preferential pathways for water movement from wet to dry soil layers. We use a multi-layer canopy model with experimental data to quantify the influence of hydraulic redistribution on ecohydrologic processes in order to characterize the competitive and facilitative interaction between mesquite and bunchgrasses in a semiarid savanna. We show that hydraulic descent dominates during the wet monsoon season, whereas hydraulic lift occurs between precipitation events. We demonstrate that in semiarid savanna, mesquite exhibits a competitive advantage over understory bunchgrass through hydraulic redistribution. This study provides insights for evaluating the relationship between coexisting vegetation.
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This research builds on the open-source ecohydrologic model, Dhara, which is capable of describing surface water and nutrient transports in a two-dimensional framework and subsurface water and nutrient transports and transformations in three dimensions. If coupled with the capabilities of reactive transport modeling, such as biogeochemical dynamics of equilibrium and kinetic reactive processes, such a model could answer questions about the role of rhizosphere dynamics in nutrient and hydrologic fluxes at a watershed scale – this is the primary focus of this work. Other questions we seek to answer are: Within the context of the IML-CZO, can we suggest improved precision fertilizer application strategies that work synergistically with subsurface dynamics? Can we understand better the transformative nature of rhizosphere dynamics to better understand and predict runoff effects downstream? Beyond the IML-CZO, what are the differences in the effects of rhizosphere dynamics across different ecosystems?
The terrestrial biosphere that encompasses vegetation and the adjacent soil and atmosphere, is a veritable biogeochemical crossroads, consisting of complex interactions between energy, water, carbon and nutrient transfers. Changes in one component, e.g., water, energy, carbon or nutrient cycles, has a feedback effect on all other components, with the result that the connection between cause and effect is not easily understood and is hard to predict with confidence. How can we predict the acclimation response of vegetation to increase in atmospheric CO2 and associated impact on the hydrologic cycle? How can we model the mutualistic and competitive dynamics between different vegetation species that co-exist? How do root water uptake patterns through hydraulic redistribution affect biogeochemical dynamics? These are some of the questions that we are exploring through this research focus.
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Soil, as the largest reservoir of carbon in the terrestrial system, is going through rapid erosion due to anthropogenic influences. Understanding how erosion-induced soil organic carbon (SOC) redistribution influences SOC transformation is critical to ensure our food security and adjustment to climate shift. The important roles of erosion and deposition on SOC dynamics have drawn increasing attention in the past decades, but quantifying such dynamics is still challenging. Particularly, a model that synthesizes above- and below-ground processes in a high-resolution catchment scale is yet developed. Here, we build a modeling framework that couples landscape evolution, surface water runoff, organic matter transformation, and soil moisture dynamics to understand the SOC dynamics by natural forcing and farming practices.
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Hyperspectral remote sensing is an efficient tool for studying various ecosystems. The surface soil characteristics are an important component in ecosystem functioning and processes. Our research is targeted at the development of methodological frameworks for the interpretation and quantification of different physical and biogeochemical properties of landscapes which help us to better understand the eco-hydrology of the landscape. The focus of this research is also to understand the geochemical impacts of large scale hydrologic disaster events such as floods on landscapes using a combination of high spectral (AVIRIS) and spatial (LiDAR) resolution datasets.
In the Midwestern United States, the agricultural ecosystem could be considered as the representative landcover and the associated drainage and evapotranspiration as the main hydrological unit. In that ecosystem, the interactions between soil, land and atmosphere will reveal the behavior of a highly anthropogenic altered landscape. An eddy covariance flux tower that captures the ecosystem fluxes provides valuable data to extend our understanding of how alterations to the land surface at intensively managed agricultural sites will impact the fluxes within the surface boundary layer. At the ecosystem scale, in this study we assess how the surface heterogeneity needs to be accounted in the land surface -atmosphere analysis to better represent the ecosystem structure.
During extreme flooding in the Ohio and Mississippi Rivers in May 2011, the U.S. Army Corps of Engineers intentionally breached several levees to activate the Bird's Point-New Madrid Floodway and also activated the Morganza and Bonnet Carré Spillway. Extensive data from field surveys and areal lidar and hyper-spectral mapping were obtained to assess flood impact and landscape vulnerability. These events, when seen as a once in a scientific-lifetime experiment provide a unique opportunity to study the impact of hydrologic extremes and develop adaptation and mitigation strategies for future events in the context of both agricultural land use and flood protection.
For more information see:
Assessment of Floodplain Vulnerability during Extreme Mississippi River Flood 2011
Mitigating land loss in coastal Louisiana by controlled diversion of Mississippi River sand
Engineering at Illinois News,
ScienceDaily
Ecohydrologic systems are emergent self-organizing systems, which evolve to exploit the variable gradients of carbon, water, nutrients, and energy at the land surface. Emergence due to self-organization is difficult to define and observe, but the concept requires the presence of nonlinear interactions, which may be studied using complex network theory. This research uses entropy-based statistics to render the eco-hydrological system as a process network of weighted couplings between the variables, which is derived from multivariate time series datasets consisting of observations or simulations. The tool used includes (1) Partial Information Decomposition, which quantifies different information contents from multiple sources to a target variable; and (2) Momentary Information Transfer, which quantifies the information from a lagged source to a target along a causal path, indicated by a time series graph representation of the network. Our research explores how complex network approaches can be used for understanding interaction between processes and emergent behavior.
The Reading Group on Information Theory in the Geosciences is one of the results of the successful 2020 SITES Virtual Meeting of the Information Theory in the Geosciences community, where 28 participants presented innovative research and discussed the intersection of information theory, machine learning, and AI. The reading group offers the possibility to researchers on different stages of their careers to actively discuss one article in each session. To see the recordings of the Reading group, subscribe to our
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For more information regarding the Reading Group on Information Theory in the Geosciences, please contact Leila Hernandez Rodriguez (lch2@illinois.edu) or Praveen Kumar (kumar1@illinois.edu)
For more information about the Information Theory in the Geosciences community, please contact Ben Ruddell (entropy@nau.edu).
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Study finds that ecosystems function like information communication networks during rainfall and drought by examining response of heat, soil moisture and carbon fluxes to precipitation. NSF News Release→ Read more→
American Meteorological Society recognizes outstanding individuals and organizations of the weather, water, and climate community and has named Dr. Praveen Kumar as an AMS fellow. Read more→
A new study shows that mesquites employ hydraulic redistribution to move water between soil layers in the savannas of Santa Rita. Read more→
While much of the rhetoric around climate change centers on extreme events such as floods or droughts, reaserchers in Dr. Kumar's group found that frequency and intensity of non-extreme or everyday precipitation events are changing and having a noticeable effect on the ecosystem. Listen to the podcast→
Researchers led by the Indian Institute of Technology – Bombay (IITB) have found that land-based moisture is as important a determinant as moisture from the sea that influences monsoon and widespread extreme rain events over central India — from Gujarat to Assam — that also includes Mumbai. Read more→
Researchers have analyzed more than five decades of data from across North America to find that changes in non-extreme precipitation are more significant than previously realized. And the changes are greater than those that have occurred with extreme precipitation. Read more→
CEE at Illinois professor Praveen Kumar has been awarded the Mahatma Gandhi Pravasi Samman award, which is given to non-resident Indians for “outstanding services, achievements and contributions for keeping the ‘Flag of India high.’” Read more→
New study finds that using corn for biofuel comes with greater environmental costs and fewer benefits than using corn for food. Read more→
Scientists have predicted that modern soybean crops produce more leaves than they need to the detriment of yield. Read more→
Listen to the PBS News interview
Scientists work with farmers to study land use impact, with eye on food and water security, environmental sustainability. Read more→
Managing water scarcity, one of the most pressing challenges society faces today, will require a novel conceptual framework to understand our place in the hydrologic cycle. Read more→
A recent study led by the UT Goodrich Chair of Excellence Thanos Papanicolaou could very well change the way we view the health of our nation’s soil. Read more→
The 2015 American Geophysical Union Class of Fellows has been selected and will be recognized at the annual Fall Meeting in San Francisco, Calif. Read more→
CyberGIS Center for Advanced Digital and Spatial Studies receives a Major Research Instrumentation grant from the National Science Foundation Read more→
Illinois-led team develops tools to search the unstructured Web, Read more→
In addition to providing renewable energy, grass crops like switchgrass and miscanthus could store some of the carbon they pull from the atmosphere in the soil, Read more→
Each day, millions of researchers across the geoscience field and around the world are busy collecting data for unique research projects. Read more→
Current breeding approaches to increase crop yield have reached biological limits, and climate change poses an additional threat to sustainable food production. Read more→
The planet is losing its albedo, but new research suggests it could be perked back up using sexy new approaches to crop breeding. Read more→
Crops that produce more while using less water seem like a dream for a world with a burgeoning population and already strained food and water resources. This dream is coming closer to reality for University of Illinois... Read more→
In May 2011, when the U.S. Army Corps of Engineers used explosives to breach a levee south of Cairo, Ill., diverting the rising waters of the Mississippi and Ohio rivers to prevent flooding in the town, about 130,000 acres of Missouri farmland were inundated. Read more→
Sand deposits were worked into trains of dunes when flood water flowed into the Bonnet Carré Spillway in Lousiana. Once the flood subsided and the spillway was closed, the water drained and dried from the spillway, thereby exposing the dunes. Read more→
Water sustainability is one of the greatest challenges facing the country of India. The urgent need for a clean, reliable water supply is complicated by a burgeoning population, agricultural demands, unreliable energy, and the monsoon system, Read more→
College of Engineering announces 2011-12 Carver Fellows. Four Engineering at Illinois graduate students have received prestigious Roy J. Carver Fellowships in Engineering. Read more→
Effective solutions to problems of sustainability require collaboration among scientists and researchers in the physical and social sciences, but information-sharing across disciplines can be problematic. Read more→
Energy researchers and environmental advocates are excited about the prospect of gaining more efficient large-scale biofuel production by using large grasses like miscanthus or switchgrass rather than corn. Read more→
Biofuels are being projected as one of the possible solutions to reduce our dependence on non-renewable sources of energy such as crude oil and gas. Many countries have set ambitious targets to increase the renewable contents in fuel. Read more→
When the U.S. Army Corps of Engineers saved the town of Cairo, IL, from flooding in May by using explosives to breach a protective levee and divert the rising waters of the Mississippi and Ohio rivers, about 130,000 acres of Missouri farmland was inundated. Read more→