Procedure for estimating model parameters of a mathematical model

Prepared for the U.S.D.A. Forest Service, Rocky Mountain Forest and Range Experiment Station, Flagstaff, Arizona.April 1976.Project period: May 1, 1975 - December 31, 1976.CER75-76DBS-RML22.References: leaves 31-32.Sponsored by the USDA Forest Service, Rocky Mountain Forest and Range Experiment Station and the Colorado State University Experiment Station. Research Agreement No. 16-541-CA

Simple procedural method for estimating on-site soil erosion

CER76-77DBS-RML-TJW38.Prepared for USDA Forest Service, Rocky Mountain Forest and Range Experiment Station.Includes bibliographical references (pages 37-38).February 1977

Mapping of potential landslide areas in terms of slope stability

CER78-79DBS-RML-TJW19.Contract no. 16-712.O1-CA.Prepared for USDA Forest Service, Rocky Mountain Forest and Range Experiment Station.Includes bibliographical references (pages 57-62).November 1978

Preliminary procedural guide for estimating water and sediment yield from roads in forest

CER76-77DBS-RML-LYS21.Prepared for USDA Forest Service, Rocky Mountain Forest and Range Experiment Station.Includes bibliographical references (page 120).November 1976

Dynamic water routing using a predictor-corrector method with sediment routing

Submitted to Bureau of Reclamation, U.S. Dept. of the Interior.September 1982.Bibliography: pages 61-63.Project no. B-228-COLO

Mathematical modeling of response from small watershed

August, 1974.Includes bibliographical references (pages 151-155).The physical quantities which describe the major watershed response to the precipitation are the water yield, the sediment yield, and the resultant stream morphology. This study provides the theoretical background and numerical methods for modeling physical processes governing the watershed response. A method of nonlinear kinematic wave approximation for flow routing has been developed to route water and sediment over land and in channels. The numerical scheme developed in this study is unconditionally stable and may be used with a wide range of time increment to space increment ratio without loss of significant accuracy. From theoretical considerations, it has been found that the flow discharge is the better selection for the unknown in numerical computations than the depth or area. The applicability of the numerical method has been tested in various cases - overland flow, natural channel, and small drainage system and has been found satisfactory for modeling of watershed response. As the applications of this flow routing procedure, a rainfall-runoff model for simulating hydrographs from small watersheds and a rainfall erosion model for calculating time-dependent erosion rates from overland flow areas have been developed. The rainfall-runoff model simulates hydrographs on the single storm basis. The model includes the water balance simulation for land surface hydrologic cycle and the water routing features for both overland flow and channel systems. Unlike the conventional approach to parametric modeling of watershed response, this model contains much more information on the physics of flow and requires much less assistance from optimization schemes than any existing water models known to the writer. For the tested basin the simulated hydrographs agree reasonably well with the measured hydrographs. The sensitivity analysis indicates that soil data are very sensitive to the computed hydrograph. Flow resistance parameters and vegetation data are less sensitive to the simulated results. In addition, this physically oriented model has the capability to predict watershed treatment effects on water yields. The rainfall-erosion model simulates both water flow and sediment flow routing in overland flow areas and produces time-dependent erosion rates comparable with the available experimental data from a soil plot. The model can generate time-dependent land forms, and the generated land form tends to be concave in shape which frequently appears in nature. It was also found that the soil erosion rate was very sensitive to the bed slope and shape. The general practice of assuming a uniform shape may result in serious errors. The mathematical models in this study may provide the short-term and the long-term responses. Theoretical interpretation of the long-term response was also made. The equations describing the basic physical processes in small watershed channels sculptured in noncohesive alluvial materials have been employed to derive the hydraulic geometry equations. Both downstream and at-a-station relations were developed. This work provides information on stream morphology response to the modified amount of precipitation or to watershed treatment effects

Analysis of watersheds and river systems: short course

Short course: Analysis of Watersheds and River Systems, Session I and II, held on May 28-June 1, 1979 and June 4-June 8, 1979 at Colorado State University, Fort Collins, Colorado.Speakers: Dr. E. V. Richardson, Dr. David Duttweiller, Mr. Lee Mulkey, Dr. Stanley A. Schumm, Dr. Daryl B. Simons, Dr. Ross Carder.Includes bibliographical references.This short course is designed for individuals dealing with the analysis of watersheds and rivers. Practical applications concerning physical processes will be emphasized.Chapter 1. General introduction / Daryl B. Simons and Ruh-Ming Li -- Chapter 2. Introduction to watershed and river analysis / Daryl B. Simons and Ruh-Ming Li -- Chapter 3. Physical processes governing response of watersheds and rivers / Daryl B. Simons, Timothy J. Ward and Ruh-Ming Li -- Chapter 4. Sediment transport / H. W. Shen -- Chapter 5. Alluvial bed roughness / H. W. Shen -- Chapter 6. Overview of flood routing methods / Ruh-Ming Li and V. Miguel Ponce -- Chapter 7. Water routing and yield from watersheds, Part I and II / Ruh-Ming Li, Daryl B. Simons, and Kenneth G. Eggert -- Chapter 8. Water routing in rivers / Yung-Hai Chen -- Chapter 9. Stage discharge relations / Robert K. Simons, Ruh-Ming Li, and Daryl B. Simons -- Chapter 10. Watershed sediment yield / Ruh-Ming Li, Daryl B. Simons, and Timothy J. Ward -- Chapter 11. Unsteady sediment routing models in rivers / Yung-Hai Chen and Daryl B. Simons -- Chapter 12. Known discharge sediment routing / Glenn O. Brown and Ruh-Ming Li -- Chapter 13. Landslide potential delineation / Timothy J. Ward, Ruh-Ming Li, and Daryl B. Simons -- Chapter 14. Application of Kalman filtering in watershed and river analysis / Nguyen Duong -- Chapter 15. Handheld calculator programs for analysis / Kenneth G. Eggert, Ruh-Ming Li, and Daryl B. Simons -- Chapter 16. Overview of case studies and data management / Daryl B. Simons, Ruh-Ming Li, and Nguyen Duong -- Chapter 17. Canal and channel design and river response analysis / Daryl B. Simons, Ruh-Ming Li, and Yung-Hai Chen -- Chapter 18. Degradation and aggradation analysis / Ruh-Ming Li and Daryl B. Simons -- Chapter 19. Watershed best management analysis / Ruh-Ming Li, Timothy J. Ward, and Daryl B. Simons -- Chapter 20. Large river basin analysis: Yazoo River Sedimentation Study / Daryl B. Simons and Ruh-Ming Li

Spatial and temporal distribution of boundary shear stress in open channel flows: final report

September 1979.Prepared for National Science Foundation, Washington D.C.CER79-80DBS-RML-JDS16.The objective of this project was to develop a better understanding of turbulent boundary shear stress processes. Experimental investigation of the spatial and temporal distributions of boundary shear stress were conducted using hot-film anemometry techniques.Grant No. ENG76-05896

Analysis of a data collection and processing system for Beaver Creek Watershed, Arizona

December 1981.CER79-80DBS-RML-TJW68.Includes bibliographical references.Prepared for USDA Forest Service, Rocky Mountain Forest and Range Experiment Station

Effect of sediment on resistance to flow in cobble and boulder bed rivers

CER-77-78KSA-DBS-RML-46.Includes bibliographical references (pages 18-19).May 1978.Field and experimental evidence are presented to demonstrate the importance of the inflow of sand and gravel size sediments, released under extreme floods from watersheds and banks of streams, on resistance to flow in channels whose beds are formed of large size roughness elements such as cobbles, rocks and boulders. The released sediments fill the spacings between the large size roughness elements, and may inundate them completely, forcing the channel to behave as a sand bed channel at a much reduced resistance to flow coefficient. Under extreme conditions resistance to flow in these channels decrease to more than one-third its original value resulting in an underestimations of the following quantities: water discharge by a factor of two, sediment discharge by a factor ranging between 8 and 64, velocity of flow by a factor of two. Furthermore, an overestimation of flow depth by a factor of two can result. Impacts of failure to estimate the previous quantities with a reasonable degree of accuracy are: underestimation of the actual quantity of available water, improper selection of bank protection material, overestimation of reservoir life, unsafe design of scour depths at hydraulic structures, improper design of highway location as well as others relating to river control and development