033 BROOKS. D. A. 1984. "Current and Hydrographic Variability in the 

 Northwestern Gulf of Mexico," Journal of Geophysical Research . Vol 89, No. C5 , 

 pp 8022-8032. 



From July 1980 to February 1981, ten current meters on three moorings 

 were developed in the 200 to 700 m depth range over the continental slope in 

 the northwestern Gulf of Mexico. The currents were characterized by energetic 

 fluctuations with time scales of a week to several months. Westward drifting 

 Loop Current anticyclones provided the principal driving mechanism for the 

 fluctuations. Longshore current speeds at the 200-m depth occasionally 

 exceeded 70 cm/s and were persistently >50 cm/s during a 2-month period in the 

 fall. Except during a hurricane, the currents were only marginally coupled 

 with the winds measured at Brownsville, Texas. Tidal motions accounted for 

 <1% of the current variance. (Author). 



034 BRUUN, P. 1962. "Sea- level Rise as a Cause of Shore Erosion," American 

 Society of Civil Proceedings, Vol 88, Paper 3065, Journal of Waterways and 

 Harbors Division , No. WW 1, pp 117-130. 



This classical paper presents the Bruun Rule which defines the influence 

 of sea level on the development of beach and offshore profile in quantitative 

 terms. Bruun also discusses quantitative estimates of erosion along Florida 

 beaches as a case study and the engineering implications of shoreline 

 recession. (Gorman) . 



035 BRUUN, P. 1983. "Review of Conditions for Uses of the Bruun Rule of 

 Erosion," Coastal Engineering , Vol 7, pp 77-89. 



The Brunn Rule of erosion, so named by American coastal geomorphologists 

 (Schwartz 1967) was first published in 1962 (Brunn, 1962) and briefly concerns 

 a long-term budget of onshore/offshore movement of material. The rule is 

 based on the assumption of a closed material balance system between the 

 (1) beach and nearshore and (2) the offshore bottom profile. Figure 1 is a 

 schematic of the effect, a translation of the beach profile by a distance s 

 following a rise a of the sea-level, resulting in a shore erosion and a de- 

 position of sediments. This topic is dealt with extensively in theory 

 (Hallermeier 1972; Allison 1980; Bruun 1980) and through observations in the 

 field (Bruun 1954 a, b, 1962, 1980; Dubois 1976; Rosen 1978, 1980; Weggel 

 1979; Fisher 1980; Hands 1980). The "rule" has sometimes been used rather 

 indiscriminately without realizing its limitations. One should always 

 remember that it is basically two-dimensional, but it is almost always applied 

 three -dimensionally. 



The background of this paper is to discuss boundary conditions and to 

 make adjustments which make the rule more "practical" or realistic. (Author). 



