ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02926.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02929.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02930.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02931.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

ABSTRACTDuring the early 1930's, more than 340,000 acres of abandoned farmland in New York State were purchased by the State Conservation Department for the planting, growing, and harvesting of trees. Since then, this land has developed from a heavy cover of weeds and brush into dense coniferous woodlands with trees averaging well over 30 feet high.Hydrologic data have been collected since 1932 in Central New York to determine the effect of the reforestation on streamflow. Data are available for three small partly reforested areas and for one non‐reforested control area.Intensive statistical analyses of the data from the four study areas were made in 1958. It was determined at that time that significant reductions in total runoff had occurred which were attributed to increases in interception and transpiration. Reductions in peak discharges during the dormant season also were indicated which were attributed to increased interception and sublimation of snowfall, and gradual desynchronization of snowmelt runoff from the wooded and open areas of partly reforested watersheds.Updating of the studies relating to peak discharges was completed in 1967 and indicated that no further changes in relative peaks had taken place since 1958. From this it is concluded that the influence exerted by the forest had become maximum by 1958 and has remained stable since the

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02932.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

ABSTRACTHydrologic research by the Tennessee Valley Authority is coordinated by the Division of Water Control Planning, with the assistance of various specialized divisions. Since 1934 the Division of Forestry Development has participated in six hydrologic studies involving watersheds that were completely or partially forested. A brief description of these projects, along with some major results and implications are given.

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02933.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

ABSTRACTLand use changes which affect the hydrological cycle encompass a broad field of agricultural, forestry, and engineering activity. A variety of research methods, ranging from the very simple to the very complex, have been used in attempting to evaluate the effects of such changes. Because of the complexity of the hydrological process, it is difficult to distinguish the effects of changes in land use from natural variations in quality, quantity, peak rates, and other characteristics of runoff. The use of plots, experimental catchments, barometer watersheds, representative basins, benchmark and vigil networks, and other methods for the collection of data, and methods of data analysis ranging from simple graphical correlations to multivariate analysis and mathematical catchment models are reviewed and classified. Current methods of research are mainly of an ad hoc nature and the major deficiency is in the study of fundamental physical processes.

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02934.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

ABSTRACTAn aspect of water resource development that has currently generated a good deal of interest among economists relates to the ‘economics of water transfer.’ Some recent investigations in this connection have studied the impact of transferring water from conventional uses (mainly agricultural) to newly emerging uses (e.g., pollution abatement, recreational, and industrial). The results of these studies indicate that water transfer contributes to economic growth, both directly and indirec

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02935.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02936.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY

摘要:

ABSTRACTDye tracers have been used in Oregon in the Collection of hydrologic data on 2,350 miles of stream channels in the Long Tom, Umpqua, Willmette, and John Day River basins, and in the Carmen‐Smith power tunnel. These investigations demonstrated the usefulness, of dye tracers for determining: (1) estimates of traveltimes and travel rates of water, (2) discharge where standard methods of measuring are not applicable, and (3) dispersion characteristics of streams. Illustrations are used to present the results of time‐of‐travel studies in simple, concise, and readily interpreted

ISSN:1093-474X    

DOI:10.1111/j.1752-1688.1968.tb02937.x

出版商:Blackwell Publishing Ltd    

年代:1968

数据来源: WILEY