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Papers by Roy Koch
Hydraulic Engineering: Saving a Threatened Resource—In Search of Solutions, 1992
Eos, Transactions American Geophysical Union, 1987
Let us know how access to this document benefits you.
were presented May 10, 2001, and accepted by the thesis committee and the
The effect of the time distribution of rainfall intensity on the prediction of the depth of exces... more The effect of the time distribution of rainfall intensity on the prediction of the depth of excess precipitation is evaluated. A comparison is made of the excess precipitation produced by an observed storm, a 10 time increment, variable intensity storm and a constant intensity storm, all with the same depth of rainfall. Excess precipitation is calculated using a physically based model for variable rainfall infiltration for three soil types. Results indicate that the required complexity of the design storm is dependent on soil type if cumulative excess precipitation depth is used as the criterion. For soil with low infiltration rates, the constant intensity approximation is adequate while for more permeable soils, the variable intensity is required. A bias toward underprediction is noted with more permeable soils under the constant intensity approximation. The 10 increment rainfall model appears adequate for all soil types.
Eos, Transactions American Geophysical Union, 1987
A special session entitled “Large Scale Climatic and Hydrologic Variability and Interactions” was... more A special session entitled “Large Scale Climatic and Hydrologic Variability and Interactions” was held at the 1986 AGU Fall Meeting in San Francisco, Calif. Sponsored jointly by the Hydrology and Atmospheric Sciences sections, the conference objective was to explore the current state of understanding and methods of analysis appropriate to climate and hydrologic processes on large time scales (e.g., seasonal or annual) and over broad areas (e.g., continental). In particular, the interactions between climate and hydrologic processes and observed variability were addressed.
Manager of the Tualati n Valley Irrigation District (TVID), were both instrumental in familiarizi... more Manager of the Tualati n Valley Irrigation District (TVID), were both instrumental in familiarizin g us with the TVID and providing the data used to test the models. Much of the program development and testing was performed by Rod Alle n as part of his Master's Thesis. Additional assistance was provided b y Greg Jones and Dan Clark on development of the Data Management System, an d by Theron Argraves in data reduction. The assistance of all thes e individuals was instrumental in the success of this work .
Adv in Sys Sci &Apps, 1995
AGUFM, Dec 1, 2006
... KLAMATH SEASONAL STREAMFLOW: TRANS-NIÑO INDEX by ADAM MCCOY KENNEDY A thesis submitted in par... more ... KLAMATH SEASONAL STREAMFLOW: TRANS-NIÑO INDEX by ADAM MCCOY KENNEDY A thesis submitted in partial fulfillment of the requirements for the degree of ... this work. For that, I am forever thankful. Adam McCoy Kennedy, 24 May 2006 Page 3. ii ...
Journal of Water Resources Planning and Management, Oct 1, 1986
Although technologically advanced methods have been used to manage large water resource systems, ... more Although technologically advanced methods have been used to manage large water resource systems, there is both a need and an opportunity for application of similar techniques at the level of the individual user. With a microcomputer as the computational tool, a decision support system (DSS) is developed for use by local water managers, where the appropriative water rights doctrine applies and irrigation is the primary water use. The DSS consists of data files describing the water rights, water use, and hydrologic systems integrated with simulation models for soil moisture and river routing in response to irrigation diversions and inflows. The model allows projection of irrigation demands and assessment of the effects of distribution strategies on flow in the river system. Operation of the DSS is demonstrated on a small, hypothetical river system. Even though the hardware and software appear to be suitable to the task, actual application may depend on cooperation among users and be limited to providing adv...
Journal of Water Resources Planning and Management, 1986
Although technologically advanced methods have been used to manage large water resource systems, ... more Although technologically advanced methods have been used to manage large water resource systems, there is both a need and an opportunity for application of similar techniques at the level of the individual user. With a microcomputer as the computational tool, a decision support system (DSS) is developed for use by local water managers, where the appropriative water rights doctrine applies and irrigation is the primary water use. The DSS consists of data files describing the water rights, water use, and hydrologic systems integrated with simulation models for soil moisture and river routing in response to irrigation diversions and inflows. The model allows projection of irrigation demands and assessment of the effects of distribution strategies on flow in the river system. Operation of the DSS is demonstrated on a small, hypothetical river system. Even though the hardware and software appear to be suitable to the task, actual application may depend on cooperation among users and be limited to providing adv...
![Research paper thumbnail of Hydrologic variability related to El Nino in the Pacific Northwest [abstract]](https://attachments.academia-assets.com/107480035/thumbnails/1.jpg)
](A preliminary statistical analysis was undertaken to evaluate whether the effect of El Nino event... more A preliminary statistical analysis was undertaken to evaluate whether the effect of El Nino events is apparent in variables related to hydrologic behavior. Annual precipitation, temperature and streamflow were used for three locations in Oregon representing coastal, Willamette Valley/Cascade and eastern Oregon regions. The mean and variance for periods of El Nino occurrence vs. those with no El Nino were computed. Numerical differences were observed but were not consistent across all stations. The coastal area showed a decrease in mean precipitation and increase in mean streamflow during El Nino events. Other stations showed a positive increase in mean for both precipitation and streamflow for El Nino events. Variance of precipitation was greater in the coastal area but smaller in other areas and vice versa for streamflow during El Nino events. Statistical analyses indicated no significant differences of means, variances or distributions using nonparametric tests for El Nino vs. non...
Water Resources Research, 1985
Based on hydrologic arguments, a stochastic model for discretized streamflow from rainfall is pro... more Based on hydrologic arguments, a stochastic model for discretized streamflow from rainfall is proposed in the form of an averaged filtered Poisson process (FPP). Using a two-component description with excess precipitation and drainage as inputs to the surface and subsurface flow systems, simplified models are presented for the physical processes. The mean, variance, and covariance function of discretized streamflow are computed in terms of the first and second moments of excess precipitation and drainage which are derived analytically. The behavior of the stochastic properties of streamflow is evaluated for various soil types, basin travel times• and effective initial soil water contents. Where there is an intuitive. feeling for the interaction of physical characteristics and stochastic properties, such as the mean, the model appears to produce qualitatively correct results. Prediction of stochastic properties is limited by the selection of an effective initial soil moisture value.
![Research paper thumbnail of Annual stream flow variability over the western United States [abstract]](https://attachments.academia-assets.com/102923293/thumbnails/1.jpg)
](EXTRACT (SEE PDF FOR FULL ABSTRACT): The variability of mean annual streamflow over the western U... more EXTRACT (SEE PDF FOR FULL ABSTRACT): The variability of mean annual streamflow over the western United States is described and related to indices of large scale atmospheric circulation over the Pacific Ocean and western U.S. Principal component analysis reveal [sic] four statistically significant modes of streamflow variability across the region.
Climate variability has direct social and economic impacts the most direct of which occur through... more Climate variability has direct social and economic impacts the most direct of which occur through the hydrologic cylce. Of primary concern to society are the hydrologic extremes of floods and droughts. An improved knowledge of climate variability and its relationship to hydrologic variability is a first step in better planning, design and operation of the systems which are both directly and indirectly dependent. In considering climatic and hydrologic varibility, there are many aspects which can be addressed. In this study we focus our analysis on the spatial patterns of variability of surface climate (precipation and temperature) and streamflow across the western United States and the relationship of these patterns to a large scale circulation in the atmosphere, the Southern Oscillation.
Hydraulic Engineering: Saving a Threatened Resource—In Search of Solutions, 1992
Eos, Transactions American Geophysical Union, 1987
Let us know how access to this document benefits you.
were presented May 10, 2001, and accepted by the thesis committee and the
The effect of the time distribution of rainfall intensity on the prediction of the depth of exces... more The effect of the time distribution of rainfall intensity on the prediction of the depth of excess precipitation is evaluated. A comparison is made of the excess precipitation produced by an observed storm, a 10 time increment, variable intensity storm and a constant intensity storm, all with the same depth of rainfall. Excess precipitation is calculated using a physically based model for variable rainfall infiltration for three soil types. Results indicate that the required complexity of the design storm is dependent on soil type if cumulative excess precipitation depth is used as the criterion. For soil with low infiltration rates, the constant intensity approximation is adequate while for more permeable soils, the variable intensity is required. A bias toward underprediction is noted with more permeable soils under the constant intensity approximation. The 10 increment rainfall model appears adequate for all soil types.
Eos, Transactions American Geophysical Union, 1987
A special session entitled “Large Scale Climatic and Hydrologic Variability and Interactions” was... more A special session entitled “Large Scale Climatic and Hydrologic Variability and Interactions” was held at the 1986 AGU Fall Meeting in San Francisco, Calif. Sponsored jointly by the Hydrology and Atmospheric Sciences sections, the conference objective was to explore the current state of understanding and methods of analysis appropriate to climate and hydrologic processes on large time scales (e.g., seasonal or annual) and over broad areas (e.g., continental). In particular, the interactions between climate and hydrologic processes and observed variability were addressed.
Manager of the Tualati n Valley Irrigation District (TVID), were both instrumental in familiarizi... more Manager of the Tualati n Valley Irrigation District (TVID), were both instrumental in familiarizin g us with the TVID and providing the data used to test the models. Much of the program development and testing was performed by Rod Alle n as part of his Master's Thesis. Additional assistance was provided b y Greg Jones and Dan Clark on development of the Data Management System, an d by Theron Argraves in data reduction. The assistance of all thes e individuals was instrumental in the success of this work .
Adv in Sys Sci &Apps, 1995
AGUFM, Dec 1, 2006
... KLAMATH SEASONAL STREAMFLOW: TRANS-NIÑO INDEX by ADAM MCCOY KENNEDY A thesis submitted in par... more ... KLAMATH SEASONAL STREAMFLOW: TRANS-NIÑO INDEX by ADAM MCCOY KENNEDY A thesis submitted in partial fulfillment of the requirements for the degree of ... this work. For that, I am forever thankful. Adam McCoy Kennedy, 24 May 2006 Page 3. ii ...
Journal of Water Resources Planning and Management, Oct 1, 1986
Although technologically advanced methods have been used to manage large water resource systems, ... more Although technologically advanced methods have been used to manage large water resource systems, there is both a need and an opportunity for application of similar techniques at the level of the individual user. With a microcomputer as the computational tool, a decision support system (DSS) is developed for use by local water managers, where the appropriative water rights doctrine applies and irrigation is the primary water use. The DSS consists of data files describing the water rights, water use, and hydrologic systems integrated with simulation models for soil moisture and river routing in response to irrigation diversions and inflows. The model allows projection of irrigation demands and assessment of the effects of distribution strategies on flow in the river system. Operation of the DSS is demonstrated on a small, hypothetical river system. Even though the hardware and software appear to be suitable to the task, actual application may depend on cooperation among users and be limited to providing adv...
Journal of Water Resources Planning and Management, 1986
Although technologically advanced methods have been used to manage large water resource systems, ... more Although technologically advanced methods have been used to manage large water resource systems, there is both a need and an opportunity for application of similar techniques at the level of the individual user. With a microcomputer as the computational tool, a decision support system (DSS) is developed for use by local water managers, where the appropriative water rights doctrine applies and irrigation is the primary water use. The DSS consists of data files describing the water rights, water use, and hydrologic systems integrated with simulation models for soil moisture and river routing in response to irrigation diversions and inflows. The model allows projection of irrigation demands and assessment of the effects of distribution strategies on flow in the river system. Operation of the DSS is demonstrated on a small, hypothetical river system. Even though the hardware and software appear to be suitable to the task, actual application may depend on cooperation among users and be limited to providing adv...
A preliminary statistical analysis was undertaken to evaluate whether the effect of El Nino event... more A preliminary statistical analysis was undertaken to evaluate whether the effect of El Nino events is apparent in variables related to hydrologic behavior. Annual precipitation, temperature and streamflow were used for three locations in Oregon representing coastal, Willamette Valley/Cascade and eastern Oregon regions. The mean and variance for periods of El Nino occurrence vs. those with no El Nino were computed. Numerical differences were observed but were not consistent across all stations. The coastal area showed a decrease in mean precipitation and increase in mean streamflow during El Nino events. Other stations showed a positive increase in mean for both precipitation and streamflow for El Nino events. Variance of precipitation was greater in the coastal area but smaller in other areas and vice versa for streamflow during El Nino events. Statistical analyses indicated no significant differences of means, variances or distributions using nonparametric tests for El Nino vs. non...
Water Resources Research, 1985
Based on hydrologic arguments, a stochastic model for discretized streamflow from rainfall is pro... more Based on hydrologic arguments, a stochastic model for discretized streamflow from rainfall is proposed in the form of an averaged filtered Poisson process (FPP). Using a two-component description with excess precipitation and drainage as inputs to the surface and subsurface flow systems, simplified models are presented for the physical processes. The mean, variance, and covariance function of discretized streamflow are computed in terms of the first and second moments of excess precipitation and drainage which are derived analytically. The behavior of the stochastic properties of streamflow is evaluated for various soil types, basin travel times• and effective initial soil water contents. Where there is an intuitive. feeling for the interaction of physical characteristics and stochastic properties, such as the mean, the model appears to produce qualitatively correct results. Prediction of stochastic properties is limited by the selection of an effective initial soil moisture value.
EXTRACT (SEE PDF FOR FULL ABSTRACT): The variability of mean annual streamflow over the western U... more EXTRACT (SEE PDF FOR FULL ABSTRACT): The variability of mean annual streamflow over the western United States is described and related to indices of large scale atmospheric circulation over the Pacific Ocean and western U.S. Principal component analysis reveal [sic] four statistically significant modes of streamflow variability across the region.
Climate variability has direct social and economic impacts the most direct of which occur through... more Climate variability has direct social and economic impacts the most direct of which occur through the hydrologic cylce. Of primary concern to society are the hydrologic extremes of floods and droughts. An improved knowledge of climate variability and its relationship to hydrologic variability is a first step in better planning, design and operation of the systems which are both directly and indirectly dependent. In considering climatic and hydrologic varibility, there are many aspects which can be addressed. In this study we focus our analysis on the spatial patterns of variability of surface climate (precipation and temperature) and streamflow across the western United States and the relationship of these patterns to a large scale circulation in the atmosphere, the Southern Oscillation.