http://www.rssboard.org/rss-specification 720 https://escholarship.org/uc/wrca_hel/rss Recent eScholarship items from Hydraulic Engineering Laboratory Reports Sun, 21 Jun 2026 22:34:55 +0000 https://escholarship.org/uc/item/91c813r8 <p>Grain size and heavy mineral analysis of 6 cliff, 12 beach, and 44 marine sediment and rock samples from Bolinas Bay were done as part of a study of sediment transport on the continental shelf of California.</p> https://escholarship.org/uc/item/91c813r8 Thu, 12 May 2011 00:00:00 +0000 Wilde, Pat Isselhardt, C. Osuch, L. Yancey, T. https://escholarship.org/uc/item/9h10f4qf <p>The main objective of the International Conference on Coastal Zone Management of River Deltas and Low Land Coastlines, Alexandria, Egypt, 6-10 March 2010 is/was to bring together engineers, scientists, managers, and officials and staff of government agencies (national and local) to address outstanding problems and programs associated with erosion! accretion! subsidence of shores of river deltas and other low land coastal areas. The venue is on the Nile Delta, southeastern coast of the Mediterranean Sea. The Port of Alexandria, and its ancient predecessors is probably the oldest in the world. This paper gives a brief history of the venue -- the delta and the ancient and present port of Alexandria The delta has a large population, extensive irrigation-based agriculture, and industrial! commercial! municipal requirements. The delta has been affected by great decreases in the delivery of water and sediment to the sea (almost a total cessation) during the past half-century. This... https://escholarship.org/uc/item/9h10f4qf Thu, 11 Feb 2010 00:00:00 +0000 Wiegel, Robert L. https://escholarship.org/uc/item/7x21s45s <p>A great amount of technical information on tsunamis is available in journals, books, reports, newspapers, and websites. After the Sumatra-Andaman Islands Earthquake and the accompanying Indian Ocean Tsunami of 26 December 2004, the author updated his list of tsunami information sources, and made the citations available in a 115 page report. The sources are listed in the following categories: Articles, papers, reports, by author(s) Bibliographies Books, monographs, pamphlets Catalogs of events Collections Journals, newsletters Maps Organizations Proceedings, symposia, workshops Videos, photographs For convenience, some sources are listed twice, under title and under author(s).</p> https://escholarship.org/uc/item/7x21s45s Thu, 11 Feb 2010 00:00:00 +0000 Wiegel, Robert L. https://escholarship.org/uc/item/75c7g2q3 <p>17 of intertidal and stream samples from Monterey Bay - Point Sur Area are analysed for grain size properties. These samples were taken to provide source area information for the study of the offshore sediments of the Central California Continental Shelf. The data are presented graphically as cumulative weight percent curves and histograms with respect to grain size. The statistical parameters median~ sorting coefficient, skewness and kurtosis are calculated for each sample.</p> https://escholarship.org/uc/item/75c7g2q3 Thu, 11 Feb 2010 00:00:00 +0000 Pause, P. Leslie, K. Wilde, Pat Henshaw, P. https://escholarship.org/uc/item/69p5n7fx <p>Sediments of Monterey Bay are divisible into five heavy mineral provinces. Two of the provinces are from the Salinas and Pa,iaro rivers, the other three are not traceable to any known source. Sediments of the Salinas River have high garnet content, and the minerals glaucophane and lawsonite distinguish the Pajaro River sediments. A mineral province is restricted to beach sands along the north shore of the bay, and is carried into the bay by longshore drift from the northwest. The heavy mineral provinces do not coincide with the age differences of the sediment cover. The San Lorenzo River does not produce a detectable mineral province.</p><p>The grain size of the sediment cover decreases uniformly with water depth from the shoreline to a depth of 300 feet, then becomes coarser in a band along the edge of the continental shelf. Grain size modes correspond to conditions of wave agitation over most of the bay. Polymodal samples and samples not in agreement with this relationship... https://escholarship.org/uc/item/69p5n7fx Thu, 11 Feb 2010 00:00:00 +0000 Yancey, T. E. https://escholarship.org/uc/item/5xj1j9mn <p>This section of the study of Bolinas Bay deals with the heavy mineralogy of the 0.175 - 0.124; 0.124 - 0.088; and 0.088 - 0.061 mm size fractions of 49 sediment samples (Fig. 1) [see Isselhardt and others (1968) for grain size and sizing procedure] plus the 0.124 - 0.088 and 0.088 - 0.061 mm size fractions of one disaggregated cliff sample 2030. Offshore rock samples 1974, 1975, 1976, 1977, 1998 and 2000 and cliff and shore samples 2027, 2028, 2029, 2031, and 2032 were not dis aggregated for mineralogical analyses. These rock samples will be discussed in Part C. Sample 1988 was lost and 2007 was too small for analysis.</p><p>The treated size fractions were divided further by separation in the heavy liquid tetrabrom-ethane (Krumbein and Pettijohn, 1938, p. 325) with a density of 2.95 gms/cc. Particles with a density greater than 2.95 gms/cc were called heavy. Particles with a density equal or less than 2.95 gms/cc were designated light. Grain mounts were made of both the heavy... https://escholarship.org/uc/item/5xj1j9mn Thu, 11 Feb 2010 00:00:00 +0000 Isselhardt, C. Osuch, L. Yancey, T. Wilde, Pat https://escholarship.org/uc/item/5k0945cv <p>The heavy mineralogy of the sand fraction for 44 offshore, 9 beach, and 3 stream samples for this region is determined optically. For each sample the percentage of the more abundant or more diagnostic transparent minerals is plotted graphically in order of persistence and additional data on accessory transparent minerals, opaques, and composite grains (rock fragments) are listed.</p> https://escholarship.org/uc/item/5k0945cv Thu, 11 Feb 2010 00:00:00 +0000 Lee, J. Glogoczowski, M. Yancey, T. Wilde, Pat https://escholarship.org/uc/item/5f440431 <p>The Monterey deep-sea fan is an arcuate wedge of sediment that occupies 100, 000 square kilometers of the floor of the Pacific Ocean at the base of the continental shelf off the coast of central : .:. California. The slope of the fan surface gently decreases radially from an axerage 6f 28' at the apex of the fan, at a depth of 3000 meters, to an average of 07' at the outer edge of the fan, at depths about 4500 meters. Two parallel submarine channels (Ascension and Monterey east), which flow respectively out of the mouths of the Ascension and Monterey canyons, cut into the smooth surface of the fan and extend approximately 300 kilometers to the outer edge of the fan. Hydraulic functions (Leopold and Maddock, 1953) calculated for these channels O. 38, (2) D = 0. 39 Q 0. 34 are: (1) W = 17. 3 Q 0. 26 , and (3) V = 0.19 Q . The hydraulic functions indicate that the energy of the current, which ' forms the channel, is concentrated at the base of the current. Bankfull mean velocities... https://escholarship.org/uc/item/5f440431 Thu, 11 Feb 2010 00:00:00 +0000 Wilde, Pat https://escholarship.org/uc/item/4xk8j05g <p>I have expanded substantially my list of information sources on: tsunami generation (sources, impulsive mechanisms), propagation, effects of nearshore bathymetry, and wave run-up on shore - including physical (hydraulic) modeling and numerical modeling. This expanded list includes the subjects of field investigations of tsunamis soon after an event; damage effects in harbors on boats, ships, and facilities; tsunami wave-induced forces; damage by tsunami waves to structures on shore; scour/erosion; hazard mitigation; land use planning; zoning; siting, design, construction and maintenance of structures and infrastructure; public awareness and education; distant and local sources; tsunami warning and evacuation programs; tsunami probability and risk criteria. A few references are on "sedimentary signatures" useful in the study of historic and prehistoric tsunamis (paleotsunamis). In addition to references specifically on tsunamis, there are references on long water wave and solitary... https://escholarship.org/uc/item/4xk8j05g Thu, 11 Feb 2010 00:00:00 +0000 Wiegel, Robert L https://escholarship.org/uc/item/3x14b465 <p>The heavy mineralogy of the sand fraction for beach samples reported by Sayles (1966) and 10 new offshore samples from South Monterey Bay was determined optically. For each sample the percentage of the more diagnostic transparent minerals is plotted graphically in order of persistence: zircon, garnet, biotite, apatite, clinozoisite and epidote, lawsonite, green hornblende, oxy-hornblende, glaucophane, sphene, zoisite, augite, jadeite, hypersthene, enstatite, and tremolite &amp; actinolite. Additional data on accessory transparent minerals, composite grains (rock fragments) and opaque minerals are listed with each graph. An updated bibliography is presented to include all new work on the geology and sediment of Monterey Bay.</p> https://escholarship.org/uc/item/3x14b465 Thu, 11 Feb 2010 00:00:00 +0000 Yancey, T. Wilde, Pat https://escholarship.org/uc/item/3pp8h8gg <p>The following work is part of a continuing study of the sediments and sedimentary processes of the continental shelf of central California done in cooperation between the University of California, Berkeley and the Coastal Engineering Research Center, U.S. Army Corps of Engineers. Sediment analyses of the samples were done at the University of California, Berkeley, utilizing the facilities of the Departments of Civil Engineering, and Geology, and the Institute of Marine Resources. The results of this study will be presented in three separate reports:</p><p>Part A Part B Part C Introduction and Grain Size Data (this volume) Mineralogical Data Interpretation and Summary of Results.</p><p>The first two reports, Parts A and B, raw data will be presented with little or no interpretation. In Part C the authors' interpretation of the data plus background information and previous work in the study area will be given.</p> https://escholarship.org/uc/item/3pp8h8gg Thu, 11 Feb 2010 00:00:00 +0000 Yancey, T. Isselhardt, C. Osuch, L. Lee, J. Wilde, Pat https://escholarship.org/uc/item/2nz5m9bs <p>This is Part 2 of the report. It has two components. They are: 1.(Sections A and B). Sources added since the first report, and corrections to a few listed in the first report. 2.(Sections C and D). References from both the first report and this report, listed in two categories: Section C. Planning and engineering design for tsunami mitigation/protection; adjustments to the hazard; damage to structures and infrastructure Section D. Tsunami propagation nearshore; induced oscillations; runup/inundation (flooding) and drawdown. For convenience, a few sources are listed twice, under title and under author(s). It should be recalled that the water waves now most commonly known as tsunamis, in the past were also called tidal waves or seismic sea waves.</p> https://escholarship.org/uc/item/2nz5m9bs Thu, 11 Feb 2010 00:00:00 +0000 Wiegel, Robert L. https://escholarship.org/uc/item/2kf907bg <p>The following work is part of a long term study of sediment trans port on the Continental Shelf of Central California. In particular, it is hoped that the data presented here will be useful also to the general study of the factors that influence the natural environment of Bolinas Lagoon now being conducted as a cooperative effort involving the University of California, Berkeley; the U. S. Corps of Engineers; the U.S. Geological Survey; the Department of Agriculture, Soil Conservation Service; and consultants for the Bolinas Harbor District.</p><p>The analyses of the marine sediments of Bolinas Bay were done at the University of California, Berkeley, utilizing the facilities of the Departments of Civil Engineering and Geology and the Institute of Marine Resources. The results of the marine study will be presented in three separate volumes:</p><p>Part A — Introduction and Grain Size Data Part B — Mineralogical Data Part C — Interpretation and Summary of Results</p> https://escholarship.org/uc/item/2kf907bg Thu, 11 Feb 2010 00:00:00 +0000 Isselhardt, C. Osuch, L. Wilde, Pat https://escholarship.org/uc/item/2hn7h88m <p>Grain s i z e , heavy mineral, and o r g a n i c c o n t e n t a n a l y s e s of 43 marine and 9 i n t e r t i d a l and f l u v i a l samples p l u s d a t a from 28 marine samples from a previous study by Sayles (1965) form the d a t a i n t e r p r e t a t e d in t h i s r e p o r t f o r the area landward of 90 meters depth (50 fathoms) from P i l l a r Point t o Pigeon P o i n t , C a l i f o r n i a , between t h e Golden Gate and Monterey Bay.</p><p>This study i n d i c a t e s : ( 1 ) ' The grain s i z e of t h e sediment decrease off shore except f o r a nose of c o a r s e r sediment from -36 t o -50 meters extending from the north t o the l a t i t u d e of Half Moon Bay. (2) The heavy mineralogy is dominated by hornblende w i t h v a r y i n g amounts of a u g i t e and hypersthene. F r a n c i s c i a n m i n e r a l s a r e found only i n t r a c e amounts. (3) Three major source areas f o r t h e s u r f a c e sediment a r e apparent (a) a great v a l l e y-... https://escholarship.org/uc/item/2hn7h88m Thu, 11 Feb 2010 00:00:00 +0000 Wilde, Pat Lee, J. Yancey, T. Glogozowski, M. https://escholarship.org/uc/item/24v319h6 <p>The flood plain formed by detritus deposited by the Los Angeles, San Gabriel, and Santa Ana Rivers, and several streams is a multi-river delta at the coast and shelf of San Pedro Bay, a hook-shaped bight in southern California. It is between Point Fermin (southeastern tip of Palos Verdes Hills) on the northwest and Newport Bayl Corona del Mar bluffs at the southeast. The 30-mile long shore has been extensively modified by anthropogenic activities and by natural events which are described; construction of dams for flood control (which also traps sediments), river mouth structures, ground subsidence owing to oil, gas and water withdrawal, structures and dredging at the entrances of landlocked bays (Alamitos, Anaheim, Newport), development and operation of marinas and navigation channels, encroachment by buildings and infrastructure. Sand beaches are along almost the entire shore: Long Beach Municipal Beach, Belmont Shore Beach, Seal Beach, Surfside Beach, Sunset County Beach,... https://escholarship.org/uc/item/24v319h6 Thu, 11 Feb 2010 00:00:00 +0000 Wiegel, Robert L. https://escholarship.org/uc/item/1jf7g583 <p>This study seeks to examine patterns of longterm sediment movement along a portion of the California coast centering around the mouth of San Francisco Bay. Naturally-occurring heavy minerals were used to trace the influence of the several sources of sediments. Surface samples were collected from beaches and from t~e 8djacent portion of the shelf under less than 130 feet of water. The samples obtained were analyzed mechanically.and petrographically. Six petrographic provinces were differentiated on the basis of physical and mineralogical properties.</p><p>It was found that sands south and west of the Golden Gate in less than 60 to 100 feet of water reflect the mineralogy of San Francisco Bay sedim~nts, a"d samples from the mollusk-rich Bolinas Bay and adjacent areas to the north and west contained large amounts of aragonite. Sediments in 60 to 100 feet of water west of the Golden Gate are unusually high in hornblende and sediments in more than 100 feet of water are somewhat... https://escholarship.org/uc/item/1jf7g583 Thu, 11 Feb 2010 00:00:00 +0000 Moore, Donald Bruce https://escholarship.org/uc/item/19s21804 <p>The following work is part of a continuing study of the sediments and sedimentary processes of the continental shelf of central Califor nia done in cooperation between the University of California, Berkeley, and the Coastal Engineering Research Center, U. S. Army Corps of Engineers. Sediment analyses of the samples were done at the Univer sity of California, Berkeley, utilizing the facilities of the Depart ments of Civil Engineering and Geology and the Institute of Marine Resources. The results of this study will be presented in three separate reports:</p><p>Part A Introduction and Grain Size Data (this volume) Part B Mineralogical Data Part C Interpretation and Summary of Results</p><p>The first two reports, Parts A and B, will be presented with little or no interpretation. In Part C the authors' interpretation of the data plus background information and previous work in the study area will be given.</p><p>The area covered by this report extends from Pigeon Point in the north... https://escholarship.org/uc/item/19s21804 Thu, 11 Feb 2010 00:00:00 +0000 Lee, J. Yancey, T. Wilde, Pat https://escholarship.org/uc/item/0wr8r6xf <p>This is Part 3 of the report. As in Tsunami Information Sources: Part 2, it has two components. They are: 1.(Sections A and B). Sources added since the first two reports, and corrections to a few listed previously. 2.(Sections C and D). References in Sections A and B (and a few from the earlier report that were not so listed), that can be classified in one of the following two categories: Section C. Planning and engineering design for tsunami mitigation/ protection; adjustments to the hazard; damage to structures and infrastructure Section D. Tsunami propagation nearshore; induced oscillations; runup/inundation (flooding) and drawdown</p> https://escholarship.org/uc/item/0wr8r6xf Thu, 11 Feb 2010 00:00:00 +0000 Wiegel, Robert L.