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Authors: Luna B. Leopold and William W. Emmett. Abstract: Quantitative measurements of bedload-transport rate in the East Fork River, Wyoming, show large spatial and temporal variabilities in traction load. Originally published: Proceedings of the National Academy of Sciences ; v. 74, no. 7 (July 1977).

Scope and Contents Authors: Luna B. Leopold and William B. Bull. Abstract: The influence of local base level and the effects of a change of base level can be separated from the influence of hydrologic and geomorphic processes with the basin under certain conditions: 1) observed changes in the longitudinal profile by aggradation or degradation when a local base level is lowered or raised while the basin remains unchanged; 2) observed changes in aggradation and/or degradation of a valley fill alluvium during...

Scope and Contents Abstract: The laboratory experiments on sediment transport conducted by G.K. Gilbert differed importantly in technique from such studies of more recent date. Gilbert's flume was level and could not be altered in slope. Sediment was introduced at the upper end at a predetermined rate and deposition built a bed gradient sufficient to transport the introduced load. The adjustment of slope in Gilbert's flume has contributed to the idea widely held by geologists that a river achieves equilibrium...

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Abstract: Discusses the combination of technology, strategy, and leadership in solving hydrologic problems. Originally published: Landa, Edward R., and Simon Ince, eds. The history of hydrology. Washington, D.C.: American Geophysical Union, 1987. (History of Geophysics; v. 3).

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Abstract: Discusses two concepts from ancient history and their relevance to the field of water in the modern age: 1) democratic governance at the will of the people was effective and responsive as long as there existed an ethos in administration, guiding beliefs even though unwritten into law; 2) democratic guidance was effective when equity-fairness to all-was not submerged to private or narrow interests. The Abel Wolman Distinguished Lecture, February 1990, National Research Council.

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"The Abel Wolman 1990 Distinguished Lecture." Originally published: Environment; v. 32, no. 2 (March 1990).

Scope and Contents Abstract: Over a period of ten years, simultaneous measurement of storm rainfall and resulting runoff during individual storms were made in small basins in the San Francisco Bay Area, California. By simple measurement, without any recording devices, data collected define a relation of basin lag time, expressed as time between center of mass of rainfall and center of mass of runoff, is a specific measure of some basin characteristics including the effect of urbanization. Originally published:...

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Abstract: A rise in base level, as behind a check dam, causes deposition of sediment. When deposition is complete, the gradient of the deposited surface is only about half that of the original channel. This new gradient does not increase with time. No known method of computation explains how incoming sediment is transported over the low gradient zone of deposition. Originally published: Israel Journal of Earth Sciences; v. 41 (1992).

Scope and Contents Authors: Luna B. Leopold, J. N. Collins, and L. M. Collins. Abstract: Measurements of velocity, depth, discharge, and slope were simultaneously made at ten gages along a natural estuarine channel 19,000 feet in length in Petaluma Marsh, California. Along the study reach the channel decreases from a width of 47 feet at its mouth to nearly zero at its headward extent, with accompanying decrease in depth. Though gage height varies with time in a smooth sinusoidal manner at all stations, this is...

Scope and Contents Authors: Luna B. Leopold and Claudio Vita-Finzi. Abstract: River valleys in the Mediterranean, the Near East, the southwestern United States, and Mexico have repeatedly alternated between alluviation and erosion, changing the availability of water and agricultural land. The timing and magnitude of the various episodes suggest that the principal cause is a shift in precipitation patterns. Human activity has distorted the severity and the initiation of these changes that have at times been...