Author: Jimmy Ray Williams
Publisher:
ISBN:
Category : Soil conservation
Languages : en
Pages : 166
Book Description
Models are developed for predicting daily sediment, phosphorus, and nitrogen yields from small watersheds; routing the yields through large watersheds; and determining the optimal operating policy of the large watershed. Sediment yield prediction with MUSLE is refined by dividing subwatersheds into land capability classes to determine the linear factors. The phosphorus and nitrogen yield models, based on loading functions, are adapted to individual storm prediction by simulating nutrient concentrations in the soil, using daily predicted sediment yields, and computing enrichment ratios. Phosphorus and nitrogen balance models are developed to predict daily nutrient concentrations in the soil. The nitrogen balance model is also used in predicting nitrate yield. The routing model is based on sediment routing and phosphorus and nitrogen loading functions. Sediment routing is refined by replacing the median sediment particle size with the entire particle size distribution. Also the routing coefficient is determined for each reach instead of using one routing coefficient for the entire watershed as in the original method. Phosphorus and nitrogen routing is accomplished by using the routed particle size distributions to calculate enrichment ratios for the loading functions. Nitrate in the runoff is considered a conservative material for the duration of an individual flood. SPNM, a problem-oriented computer language is developed to make routing more convenient. SPNM is designed to predict sediment, phosphorus, and nitrogen yields for individual storms on small watersheds and to route the yields through large watersheds.
Optimal Operation of Large Agricultural Watersheds with Water Quality Constraints
Author: Jimmy Ray Williams
Publisher:
ISBN:
Category : Soil conservation
Languages : en
Pages : 166
Book Description
Models are developed for predicting daily sediment, phosphorus, and nitrogen yields from small watersheds; routing the yields through large watersheds; and determining the optimal operating policy of the large watershed. Sediment yield prediction with MUSLE is refined by dividing subwatersheds into land capability classes to determine the linear factors. The phosphorus and nitrogen yield models, based on loading functions, are adapted to individual storm prediction by simulating nutrient concentrations in the soil, using daily predicted sediment yields, and computing enrichment ratios. Phosphorus and nitrogen balance models are developed to predict daily nutrient concentrations in the soil. The nitrogen balance model is also used in predicting nitrate yield. The routing model is based on sediment routing and phosphorus and nitrogen loading functions. Sediment routing is refined by replacing the median sediment particle size with the entire particle size distribution. Also the routing coefficient is determined for each reach instead of using one routing coefficient for the entire watershed as in the original method. Phosphorus and nitrogen routing is accomplished by using the routed particle size distributions to calculate enrichment ratios for the loading functions. Nitrate in the runoff is considered a conservative material for the duration of an individual flood. SPNM, a problem-oriented computer language is developed to make routing more convenient. SPNM is designed to predict sediment, phosphorus, and nitrogen yields for individual storms on small watersheds and to route the yields through large watersheds.
Publisher:
ISBN:
Category : Soil conservation
Languages : en
Pages : 166
Book Description
Models are developed for predicting daily sediment, phosphorus, and nitrogen yields from small watersheds; routing the yields through large watersheds; and determining the optimal operating policy of the large watershed. Sediment yield prediction with MUSLE is refined by dividing subwatersheds into land capability classes to determine the linear factors. The phosphorus and nitrogen yield models, based on loading functions, are adapted to individual storm prediction by simulating nutrient concentrations in the soil, using daily predicted sediment yields, and computing enrichment ratios. Phosphorus and nitrogen balance models are developed to predict daily nutrient concentrations in the soil. The nitrogen balance model is also used in predicting nitrate yield. The routing model is based on sediment routing and phosphorus and nitrogen loading functions. Sediment routing is refined by replacing the median sediment particle size with the entire particle size distribution. Also the routing coefficient is determined for each reach instead of using one routing coefficient for the entire watershed as in the original method. Phosphorus and nitrogen routing is accomplished by using the routed particle size distributions to calculate enrichment ratios for the loading functions. Nitrate in the runoff is considered a conservative material for the duration of an individual flood. SPNM, a problem-oriented computer language is developed to make routing more convenient. SPNM is designed to predict sediment, phosphorus, and nitrogen yields for individual storms on small watersheds and to route the yields through large watersheds.
Scientific and Technical Aerospace Reports
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 734
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 734
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
EPA-600/2
Author:
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 702
Book Description
Publisher:
ISBN:
Category : Environmental engineering
Languages : en
Pages : 702
Book Description
Selected Water Resources Abstracts
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 1162
Book Description
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 1162
Book Description
Selected Irrigation Return Flow Quality Abstracts, 1978
Author: Gaylord V. Skogerboe
Publisher:
ISBN:
Category : Irrigation
Languages : en
Pages : 360
Book Description
Publisher:
ISBN:
Category : Irrigation
Languages : en
Pages : 360
Book Description
U.S. Department of Agriculture Miscellaneous Publication
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 620
Book Description
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 620
Book Description
Selected Irrigation Return Flow Quality Abstracts
Author:
Publisher:
ISBN:
Category : Irrigation water
Languages : en
Pages : 364
Book Description
Publisher:
ISBN:
Category : Irrigation water
Languages : en
Pages : 364
Book Description
Model simulation of soil loss, nutrient loss, and change in soil organic carbon associated with crop production
Author:
Publisher:
ISBN:
Category : Electronic government information
Languages : en
Pages : 264
Book Description
Publisher:
ISBN:
Category : Electronic government information
Languages : en
Pages : 264
Book Description
Soil Processes and Water Quality
Author: B.A. Stewart
Publisher: CRC Press
ISBN: 1000157954
Category : Technology & Engineering
Languages : en
Pages : 414
Book Description
Agrochemicals and agricultural practices have a tremendous impact on environmental quality, particularly their role in water quality degradation. Soil Processes and Water Quality examines principles and practices that minimize the risks of water pollution while enhancing agricultural intensification and productivity. It focuses on how agricultural practices-such as tillage methods, use of fertilizers and manures, cropping systems, and the use of agrochemicals and pest control measures-impact soil processes and affect water quality. Extensive coverage of such topics as water contamination by runoff, leaching, macropore flow, and sediments is also included. Rapid increases in the use of agrochemicals make Soil Processes and Water Quality an indispensable reference for soil scientists, water quality professionals, researchers, environmental chemists, agrochemicals professionals, government agency employees, academic instructors, agronomists, and students.
Publisher: CRC Press
ISBN: 1000157954
Category : Technology & Engineering
Languages : en
Pages : 414
Book Description
Agrochemicals and agricultural practices have a tremendous impact on environmental quality, particularly their role in water quality degradation. Soil Processes and Water Quality examines principles and practices that minimize the risks of water pollution while enhancing agricultural intensification and productivity. It focuses on how agricultural practices-such as tillage methods, use of fertilizers and manures, cropping systems, and the use of agrochemicals and pest control measures-impact soil processes and affect water quality. Extensive coverage of such topics as water contamination by runoff, leaching, macropore flow, and sediments is also included. Rapid increases in the use of agrochemicals make Soil Processes and Water Quality an indispensable reference for soil scientists, water quality professionals, researchers, environmental chemists, agrochemicals professionals, government agency employees, academic instructors, agronomists, and students.
Soil Hydrology, Land Use and Agriculture
Author: Manoj Shukla
Publisher: CABI
ISBN: 9781845938772
Category : Science
Languages : en
Pages : 434
Book Description
Agriculture is strongly affected by changes in soil hydrology as well as changes in land use and management practices and the complex interactions between them. This book aims to develop an understanding of these interactions on a watershed scale, using soil hydrology models and addresses the consequences of land use and management changes on agriculture from a research perspective. It includes case studies that illustrate the impact of land use and management on various soil hydrological parameters under different climates and ecosystems. It is suitable for researchers and students in soil sc
Publisher: CABI
ISBN: 9781845938772
Category : Science
Languages : en
Pages : 434
Book Description
Agriculture is strongly affected by changes in soil hydrology as well as changes in land use and management practices and the complex interactions between them. This book aims to develop an understanding of these interactions on a watershed scale, using soil hydrology models and addresses the consequences of land use and management changes on agriculture from a research perspective. It includes case studies that illustrate the impact of land use and management on various soil hydrological parameters under different climates and ecosystems. It is suitable for researchers and students in soil sc