Hydrology Days

Permanent URI for this collection

https://hdl.handle.net/10217/199983

Each year the American Geophysical Union "Hydrology Days" meeting brings together water scientists, researchers, and students to discuss the current state of the science and latest water-related research findings. Digital copies of the meetings from 2000-2018 may be found here. Digital copies of the meetings from 2019- are published in issues of the Colorado Water Center newsletter.

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Open Access
43rd annual AGU hydrology days
(Colorado State University. Libraries, 2023) American Geophysical Union, author; Colorado State University, author; One Water Solutions Institute, author
Includes the schedule and presentation abstracts only. The 43rd Annual American Geophysical Union Hydrology Days meeting held on March 21-22, 2023 provides a unique opportunity for students, faculty, staff and practitioners to engage in wide range of water-related interdisciplinary research topics. The 2023 event lands on the United Nations' annual World Water Day (March 22) with an emphasis on accelerating change to solve the water and sanitation crisis. In addition, building upon the University's Courageous Strategic Transformation we endeavor to broaden participation across campus as well as regional institutions. This year we encourage presentations from a wide variety of sessions designed to highlight the interconnections of water and linked systems. The Student Showcase will provide an opportunity for students to exchange ideas, present their research findings and refine their science communication skills. Select students will be invited to contribute to a special issue of Colorado Water! Students interested in entering the student competition must adhere to posted deadlines, register and submit an abstract to confirm their participation. Faculty, staff, practitioners and industry representatives are encouraged to attend the event and learn just how poised our students are to enter the workforce – take this opportunity to enhance the student experience and invest in the future! The spring meeting endeavors to expand our attendance beyond engineering and hydrology by engaging colleges across campus to holistically represent the far-reaching facets of water.
Open Access
42nd annual AGU hydrology days
(Colorado State University. Libraries, 2022) American Geophysical Union, author; Colorado State University, author
Includes the schedule and presentation abstracts only. The 42nd Annual American Geophysical Union Hydrology Days meeting held on April 25-27, 2022, provides a unique opportunity for students, faculty, staff and practitioners to engage in wide range of water-related interdisciplinary research topics.
Open Access
41st annual AGU hydrology days
(Colorado State University. Libraries, 2021) American Geophysical Union, author; Colorado State University, author
Includes the schedule and presentation abstracts only. The 41st Annual American Geophysical Union Hydrology Days meeting held on March 30-31, 2021, provides a unique opportunity for students, faculty, staff and practitioners to engage in wide range of water-related interdisciplinary research topics. Unfortunately, the global pandemic has left students with limited opportunities to share their research and satisfy graduation requirements. This year the spotlight focused on students to highlight the interconnections of water and linked systems. The 2021 Student Showcase provides an opportunity for students to exchange ideas, present their research findings and refine their science communication skills.
Open Access
40th annual AGU hydrology days
(Colorado State University. Libraries, 2020) American Geophysical Union, author; Colorado State University, author; Colorado State University, publisher
Includes the schedule and presentation abstracts only. The 40th Annual American Geophysical Union Hydrology Days meeting, held on April 13-14, 2020, provides a unique opportunity for students, faculty, staff and practitioners to engage in wide range of water-related interdisciplinary research topics. In addition to hydrologic systems, the event covers a broad range of water concerns, including agriculture and water rights, sustainability and conservation, climate change and urbanization, economics and policy. Hydrology Days' 40th anniversary builds on CSU legacy of excellence in water-related studies. Program includes abstracts of presentations.
Open Access
Hydrology days, 2019 - Student showcase: Hydrology is for everyone! - conference program
(Colorado State University. Libraries, 2019) American Geophysical Union, author; Colorado State University, author; Colorado State University, publisher
Includes the schedule and presentation abstracts only. The 39th annual AGU hydrology days was held in the Lory Student Center at Colorado State University on March 27-March 29, 2019. The meeting provides a unique opportunity for students, faculty, staff and practitioners to engage in wide range of water-related interdisciplinary research topics. In addition to hydrologic systems, the event covers a broad range of water concerns, including agriculture and water rights, sustainability and conservation, climate change and urbanization, economics and policy. The conference includes the Student Showcase: Hydrology is for Everyone! This program includes hyperlinks to each abstract.
Open Access
Uncertainty in flood routing: diffuse wave models by fuzzy set theory approach
(Colorado State University. Libraries, 2018) Sales Castro, Maria Patrícia, author; de Lucena, Karyna Oliveira Chaves, author; Vidal, Ticiana Fontoura, author; de Souza, Alice Rocha, author; Chagas, Patricia Freire, author; de Souza, Raimundo Oliveira, author; Colorado State University, publisher
Impacts caused by flood routing affect families, economic activities, public and private systems. Impacts and economic losses has increased considerably, because these areas, in general, there is a growing concentration of people and economic activities present in the region. Flood routing is a problem, both developed and developing countries. Many hydrodynamic problems that involve of the propagation flood waves along the length in natural channels are solved by Saint-Venant equations. In most practical applications of flow routing in open channels, inertia terms are negligible, thus the system of Saint-Venant equations is reduced to a parabolic equation, known as the diffusive wave equation. This research aims to apply the fuzzy set theory in diffusive wave models at natural channels, in order to verify the uncertainties related to the hydrodynamic parameters present in these models. Through the implicit finite difference schemes was solved partial differential equations present in Saint-Venant equations. Simulations were carried out for different scenarios in the water body. It was developed a computer program, coded in Fortran. Results allowed establishing some interesting analysis with regard to the behavior of diffusive wave flood routing, it is strong influence of hydraulic parameters, the slope feature and Manning roughness coefficient. Results allowed concluding that the application of the fuzzy set theory in the hydrodynamic systems, it is a viable alternative for determining the uncertainty in flooding and thus be more a support tool in water resources management programs.
Open Access
Use of the Manning equation for predicting the discharge of high-gradient canals and natural streams
(Colorado State University. Libraries, 2018) Ostraff, Ashley A., author; Emerman, Steven H., author; Udy, Nicholas D., author; Allen, Sarah M., author; Rakotoarisaona, Henintsoa, author; Gherasim, Janelle, author; Stallings, Alison M., author; Saldivar, Jeremy N., author; Larsen, Kenneth L., author; Abbott, Morgan, author; Colorado State University, publisher
The Manning Equation is used to predict stream or canal discharge from hydraulic radius, slope of the water surface, and a Manning roughness coefficient. Jarrett (1984) proposed that, for high-gradient streams (S > 0.002), the Manning roughness coefficient could be predicted from the hydraulic radius and the slope alone. The objective of this study was to develop separate empirical formulae, depending upon climate and stream bank lithology, for predicting the Manning roughness coefficient for high-gradient canals and natural streams from hydraulic radius and slope. The objective was addressed by separating the database used by Jarrett (1984) according to stream bank lithology, and by carrying out new measurements of the Manning roughness coefficient at nine high-gradient stream sites with crystalline (igneous and metamorphic) banks and two high-gradient stream sites with carbonate banks in Haiti, nine high-gradient stream sites with carbonate banks in Utah, and 14 high-gradient canals in Utah. The data were used to develop empirical formulae for predicting the Manning roughness coefficient for (1) continental climate, clastic stream bank (2) tropical climate, crystalline stream bank (3) continental/tropical climate, carbonate stream bank (4) continental climate, earthen canal with grassy bank. The Manning roughness coefficient was a negative function of hydraulic radius for the first case and a positive function for the other cases, suggesting that the increase in turbulent resistance is caused by the roughness of the sediment in the first case, but by the increase in the Reynolds number, which is proportional to the depth, in the other cases.
Open Access
Estimation of soil erosion risk of the Euphrates river watershed using RUSLE model, remote sensing and GIS techniques
(Colorado State University. Libraries, 2018) Khassaf, Saleh Issa, author; Jaber Al Rammahi, Ali Hussein, author; Colorado State University, publisher
The average annual soil erosion is the main problem of natural water resources and the agriculture, the most dominant factor that effect on the soil erosion is water. The aim of this study was estimated the average annual soil erosion by using RUSLE model and the ArcGIS software of the Euphrates river watershed, this model was based on five factors for calculation soil erosion map of the watershed. The rainfall-runoff erosivity (R) factor map was computed for precipitation data that content from thirty-one stations scattered within and outside the watershed area to assist in the interpolation estimation. The soil erodibilty (K) factor map of topsoil was derived based on data that provided from UN-FAO (Food and Agriculture Organization of the United Nations). The topographic factor map can be depended mainly on the raw images of the Digital Elevation Model (DEM) of the watershed which DEM of Euphrates watershed consisted of sixteen images with a spatial cell size 30m*30m. The cover/crop management (C) factor map can be calculated based on the NDVI (Normalized Difference Vegetation Index) map of the Euphrates basin, the NDVI map can be derived based on remote sensing of the data available in the United State Geological Survey (USGS) for multi-images of the study area. The support practice factor (P) can be assumed equal to 1 because the bare land area occupied about 92% of the total area for computational years 2013 and 2017. The average annual soil loss for the year 2017 was ranged from 0 to 2995.614 tons/ha/year, 99.69% of the watershed area had the slight soil erosion loss while 0.17% of the watershed was represented the soil erosion of the slight to moderate type. For the year 2013, the soil loss estimated from 0 to 2610.47 tons/ha/year, 99.7% of watershed had the slight soil erosion loss while 0.16% of the watershed was classified into the slight to moderate soil loss type. Furthermore, the other soil loss types such as moderate to extremely high were found in the riverbed of the Euphrates. The sediment delivery ratio can be computed for upstream of Al Shamia barrage based on the field value of sediment yield for the year 2013. The observation value equaled to 25.62% while it's equal to 26.12% based on the Renfro equation.
Open Access
Research on characteristics of groundwater recharge in Weishan Irrigated District based on bromide tracer
(Colorado State University. Libraries, 2018) Cong, Sin, author; Xu, Zhenghe, author; Wang, Tong, author; Colorado State University, publisher
It is of great theoretical and practical significance to determine the vertical infiltration recharge of groundwater by Bromide tracer technology, which reveals the spatial variation rule of groundwater recharge and improves the theory and method of groundwater resource evaluation. Bromide was used as tracer in Weishan Irrigated District to determine the groundwater recharge as well as to evaluate the impacts of different irrigation basin location, irrigation regime and crop types on the recharge. The comprehensive recharge coefficient and the Kringing Spatial Interpolation methods were used to distinguish the effects of precipitation and surface water irrigation on groundwater recharge rate. The results showed that the recharge rates ranged from 85.8 to 243 mm/a, with an average of 168 mm/a; the average recharge rate in the upstream district was greater than that in the downstream; the average recharge rate of irrigated land (193 mm/a) is greater than that of non-irrigated land (110 mm/a). The recharge rate of winter wheat-summer maize and cotton fields with irrigation was 210 mm/a and 140 mm/a, respectively while it was 115 mm/a and 94.1 mm/a under no irrigation conditions. The comprehensive recharge coefficient of groundwater in the upstream irrigation area was larger than that in the downstream. By comparing the spatial distribution of groundwater level and comprehensive recharge coefficient, it was found that there was an inverse relationship between the groundwater level and the comprehensive recharge coefficient.
Open Access
Distribution of velocities in a cross section using the logD method: application to a cross section of the Wainiha River
(Colorado State University. Libraries, 2018) Milhous, Robert T., author; Colorado State University, publisher
The logD method distributes velocities across a transect (cross section) uses the equation v = C√Sd log(α(d / k)). In the equation d is the depth at a location in the cross section, S is the slope, α is an empirical parameter, k is the absolute roughness height and C is a constant (32.61 for traditional English, and 18.00 for metric units). Typical value of α is 10.96 (based on theoretical considerations), and 4.70 (based on empirical measurements). The distribution of velocities in a cross section is used in the Physical Habitat Simulation System (PHABSIM) to calculate physical habitat for aquatic animals. The logD method is an effective method for calculation of the velocity distribution and helps reduce problems associated with the simulation of velocities at the edges of a channel. The method requires a consistence approach to the selection of the roughness heights. Roughness heights determined from measured velocities may not have a physical meaning but if roughness heights based on measured heights are used they must be used through out the cross section and not mixed with roughness heights determined from measured velocities.
Open Access
Hydrology days award
(Colorado State University. Libraries, 2018) Colorado State University, author; Colorado State University, publisher
The 2018 Hydrology Days Award was presented to Stephen J. Burges.
Open Access
Fifty years observing issues in hydrology and water resources engineering - abstract
(Colorado State University. Libraries, 2018) Burges, Stephen J., author; Colorado State University, publisher
Abstract of award lecture "Fifty years observing issues in hydrology and water resources engineering" given on March 20, 2018 by Stephen J. Burges, winner of the 2018 Hydrology Days Award.
Open Access
A long-term context for snow water equivalent trends in Rocky Mountain National Park
(Colorado State University. Libraries, 2017) Patterson, Glenn G., author; Fassnacht, Steven R., author; Colorado State University, publisher
The seasonal snowpack in Rocky Mountain National Park is critical to the local and downstream water supply and the ecosystem of the park, and is important for winter recreational opportunities. Recent regional studies of trends in observed snow water equivalent (SWE) over the past three and a half decades have illustrated that temperatures are rising. Snow accumulation is decreasing, averaging on the order of a 2 to 4 cm/decade decline with snowmelt tending to be earlier, averaging on the order of 2 to 4 days/decade sooner. To place these SWE trends observed over the past few decades into a longer-term context, multi-century SWE reconstructions were derived from tree-ring widths and examined to determine whether similar multi-decade trends have occurred in the past. Possible SWE trends were examined into the future using projections from the Coupled Model Inter-comparison Project-Phase 5 (CMIP5) climate models linked to hydrologic models to identify models that best fit the observed data. From these model projections, possible SWE trends were estimated for the remainder of the 21st century. Results of the paleo-analysis suggest that similar multi-decade declining trends in SWE have occurred in the study area at certain times over the past four centuries. Results of the model projections suggest that recently observed trends (past 3+ decades) are likely to continue over the next eight or so decades.
Open Access
Two 1970's methods for prescribing instream flow regimens
(Colorado State University. Libraries, 2017) Milhous, Robert T., author; Colorado State University, publisher
At the beginning of the decade of the 1970's it was clear that unless an instream flow regimens was quantified the need for an instream flow. Three 1970's methods are reviewed: 1) a method based on the characteristics of the streamflows is the Montana Method, 2) a method based on the hydraulic attributes of the channel is the Water Surface Profile Method, and a method that uses hydraulic attributes contained in papers on the Montana Method. Strong points of the Montana Method are the relation between the magnitude of the instream flow and the quality of the habitat, and the variation of the instream flow between seasons. The WSP Method did link biological needs to river hydraulics which is a strong point. These links have proven to be very fruitful in instream flow studies. The Montana Method hydraulic criteria are useful but there is a stream size effect that was not accounted for in the application of the criteria.
Open Access
State politics, water supply, and systems engineering
(Colorado State University. Libraries, 2017) Weaver, Ed, author; Colorado State University, publisher
Tarrant Regional Water District (TRWD) was established in 1924 with two primary missions – flood control and water supply in and around Tarrant County, Texas. TRWD's current 11 county service area population of 1.8 million is projected to be 2.25 million by 2050. Sustainability will be key in meeting these growing demands. In 1997, the 75th Texas Legislature passed Senate Bill 1 aimed at improving development and management of the state's water resources by establishing a regional water planning process. In terms of systems engineering doctrines, Texas basically established a state wide water resources super system or system of systems and provided the associated concept development stage process for the state's designated planning regions to execute on an iterative and recurring five year cycle. With respect to sustainability, Senate Bill 1 also directed that water conservation options and actions be integral to the water supply planning, permitting and operational developments. Part of TRWD's sustainable water supply is a 2,000 acre constructed wetlands put online in 2013. This paper examines TRWD's constructed wetlands from the systems engineering and sustainability perspectives. From the systems engineering standpoint, the Richland Chambers (RC) Wetlands Facility was designed and constructed using a multi-phased prototype approach allowing TRWD to research and evaluate treatment performance, operation and maintenance issues, and design criteria through actual field trials and implementation. The RC Constructed Wetland meets the State's conservation (sustainability) requirement in that the developed indirect reuse system successfully treats and enhances the quality of the Trinity River return flows from TRWD's service area prior to discharging back into Richland Chambers Reservoir for the return trip to the service area. The net achievement is adding the equivalent of a new source to TRWD's water supply inventory without building a new reservoir or transmission conveyance (system capacity upgrade), achieving the State required conservation (recycling) mandate in Senate Bill 1 with indirect reuse, and maintaining the existing environmental water quality in Richland Chambers Reservoir with the removal of nutrients and sediments.
Open Access
Climate and humans as amplifiers of hydro-ecologic change: science and policy implications for intensively managed landscapes - abstract
(Colorado State University. Libraries, 2017) Foufoula-Georgiou, Efi, author; Colorado State University, publisher
Abstract of award lecture "Climate and humans as amplifiers of hydro-ecologic change: science and policy implications for intensively managed landscapes" given on March 21, 2017 by Efi Foufoula-Georgiou, winner of the 2017 Hydrology Days Award.
Open Access
Hydrology days award
(Colorado State University. Libraries, 2017) Colorado State University, author; Colorado State University, publisher
The 2017 Hydrology Days Award was presented to Efi Foufoula-Georgiou.
Open Access
Adapting subsurface drip irrigation system to deficit irrigation: proceedings of Hydrology days 2016
(Colorado State University. Libraries, 2016) Varzi, Manijeh Mahmoudzadeh, author; Oad, Ramchand, author; Colorado State University, publisher
Subsurface drip irrigation (SDI) is a type of drip irrigation with buried pipe lines so that water is applied directly to the root zone and under soil surface. SDI systems have high application efficiency but need high technology for installation and are, thus, costly. SDI is relatively new to Colorado and mainly used for vegetables. As a costly system its use is still limited. However, it is compatible with automation so that timing and volume of water application can be controlled with great precision. SDI provides a good opportunity in times of water scarcity when deficit irrigation is inevitable. Drought in a river basin increases the value of water and farmers can benefit from selling part of their water to municipal and industrial water users. The remaining water is normally not enough for fully irrigating the crops so this practice is called deficit irrigation. Reduced yield due to water deficit can be predicted using crop water production functions; however, it is essential to control water application precisely so that the predicted yield is guaranteed. This paper will explore the opportunities that SDI provides for practice of deficit irrigation.
Open Access
Water and energy cycles coupling diagnosed from remotely sensed global observations - abstract
(Colorado State University. Libraries, 2016) Entekhabi, Dara, author; Colorado State University, publisher
Abstract of award lecture "Water and energy cycles coupling diagnosed from remotely sensed global observations" given on March 22, 2016 by Dara Entekhabi, winner of the 2016 Hydrology Days Award.
Open Access
A conceptual framework for the use of machine learning for the synthesis of stream discharge - gage height rating curves
(Colorado State University. Libraries, 2016) Allen, Sarah M., author; Emerman, Steven H., author; Murdock, Thomas H., author; Tulley, Skyler K., author; Colorado State University, publisher
The objective of this research is to use machine learning for the synthesis of stream discharge – gage height rating curves from easily measurable hydrogeologic parameters. A machine learning algorithm would require as input a compilation of relevant hydrogeologic parameters for each gaging station. Since such a compilation does not yet exist, the first step has been to create a conceptual framework that identifies the relevant hydrogeologic parameters that would need to be compiled. Frequent reverse flow or flood waves preclude the existence of a rating curve (unique relationship between gage height and discharge). If a rating curve exists, then a stable channel has a power-law rating curve. Deviations from the power-law curve result from deposition (power-starvation) or scouring (sediment-starvation), which could occur at the high or low range of discharge or both. The eight types of deviation (including no deviation) from the power-law curve can be regarded as eight functional forms of rating curves, which can be represented as lines, parabolas or cubic polynomials on plots of the Z-scores of the logarithms of gage height and discharge. Rating curves can be classified into the eight types based on the hydrogeologic criteria of (1) stream slope (2) relative erodibility of the stream banks (3) distance to the nearest upstream and downstream confluences with relatively significant discharge. USGS gaging stations in Utah were chosen randomly until each of the eight types of rating curves was found. The first example of each type was shown to be consistent with the corresponding hydrogeologic criteria.