Benthic fauna and sediment in the vicinity of the Barbers Point (Honouliuli) ocean outfall were sampled from 1986-2010. To assess the environmental quality, sediment grain size and sediment chemistry were measured. To identify the fauna, mollusk species and nonmollusk species sitings were tabulated. Stations were located both within and on the boundary of the zone of initial dilution (ZID) and at distances of 1.2 to 2 km from the ZID boundary. Data are provided in MS Excel spreadsheets. This set is an update to NODC Accession 9900098.

A long term project to monitor water quality and sediment processes in Kaneohe Bay was initiated in November 1998 and continued through July 2001. Four primary sites in the bay were chosen which had been used in historical water quality studies. Additional sites were located in feeder streams within a mile of the bay and just offshore in the open ocean.

Surf reports are typically made several times per day at select locations around Oahu, primarily by Honolulu City and County lifeguards and the Surf News Network, Inc. Wave heights are reported in Hawaii Scale Feet, which systematically underestimates breaker size by as much as one-half. Although exactly when and why this tendency originated is highly disputed, it became the primary means of communicating surf size by the late 1960s. From publicly available surf reports and other notes from reputable surfers, Mr. Larry Goddard logged heights from 1968 through September 1987 and Mr. Patrick Caldwell has done similarly from September 1987 to 2004. The caretakers of the dataset typically cross-check observations among the various reporters for quality control. The daily value in the GC set represents the upper end of the reported height range, which is roughly equivalent to H1/10, for the observing time and location with the highest breakers along a given coast facing a similar direction. For the north shore, most observations are taken at Sunset Point, which is usually one of the areas of highest surf under the dominant northwest swells. For days of extreme surf with heights greater than 15 HSF, visual observations are reported from Waimea Bay, where breakers are closer to shore. For the south shores, Ala Moana is usually the reporting site. Observations from the west and east side of Oahu have also been recorded although these reports are of lower quality. Comparisons of the GC database to 1981-2002 data from NOAA buoy 51001, which is located roughly 400 km west-northwest of Oahu, show the north shore surf observations are temporally consistent with the shoaling-only, buoy-estimated breaker heights and have an uncertainty of 10 to 15% of the surf height.

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A downward-looking moored ADCP instrument was deployed at the surface about a mile south of Honolulu Harbor in waters of about 280 feet. The instrument was in operation from May 1997 - August 1998, when it was tangled in the mooring line of a ship and made unoperational. The data are one-minute samples taken from 20 to 62 m at 2 m depth intervals. Primary processing was done by Oceanit. Michelle Eich, a graduate student at the University of Hawaii, applied quality control to select time periods of the data. Some of the other periods have remaining questionable features.

Sandy ocean beaches are a popular recreational destination, often surrounded by communities containing valuable real estate. Development is on the rise despite the fact that coastal infrastructure is subjected to flooding and erosion. As a result, there is an increased demand for accurate information regarding past and present shoreline changes. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is compiling existing reliable historical shoreline data along open-ocean sandy shores of the conterminous United States and parts of Alaska and Hawaii under the National Assessment of Shoreline Change project. There is no widely accepted standard for analyzing shoreline change. Existing shoreline data measurements and rate calculation methods vary from study to study and prevent combining results into state-wide or regional assessments. The impetus behind the National Assessment project was to develop a standardized method of measuring changes in shoreline position that is consistent from coast to coast. The goal was to facilitate the process of periodically and systematically updating the results in an internally consistent manner.

A multifaceted study of the sediment dwelling benthos was conducted in Mamala Bay to identify suitable species as indicators of sewage enrichment. There are five components to this study - 1) reproduction and life histories of potential indicator species, 2) seasonal abundance of each indicator species near the outfall and at the control site (Diamond Head) at 70m depth, 3) abundance and species richness of indicators and associated benthos at 6 sites and the control at 40m depth, 4) sediment grain size analyses at each site to characterize the infaunal habitat, 5) CHN and Nitrogen analyses from the study area to elucidate the role of sewage in the organic content of the sediments. Each component is presented as a separate section as methods and analyses differ for each. This same format is used for the appendices. Sediment samples (7.6cm diam x 5.0cm depth) were collected with a Van Veen grab from 40m and 70m stations. Live worms were removed from freshly collected sediment and cultured in the laboratory for developmental and life history information. Reproductive data was gathered for designated indicator species, (Neanthes arenaceodonta, Capitella capitata, Pionosyllis heterocirrata and Ophryotrocha sp. A). N. arenaceodonta was not successfully cultured as only two individuals were found. Progeny were obtained for the three others and Ophryotrocha sp. A was the most successful in culture. Seasonal abundance of indicators at the outfall (B3) and control site show that all indicator species are more abundant at B3, and in the summer months than at Diamond Head, or during winter months. P. heterocirrata is widely distributed throughout the year and Ophryotrocha sp. A was only found at the deep outfall site in any number. Community studies based on preserved samples collected in the same way from the 40m (S series) stations show abundant and species assemblages at all stations, including the control. Overall polychaete abundances are higher at 40m stations than near the outfall and exceeded the abundance estimates at the control. Species richness estimates show some site by site variation but all stations are specious and often exceed the control. Differences are seen between the dominant species groups at outfall and 40m far field stations. The more westerly sites had more tubicolous and particle feeding worms (sabellids and oweniids) than the stations closest to the outfall (substantiated by historical data base, biomonitoring program), and a different community was evident at east Mamala site S6 and the control. Grain size analyses show higher proportions of fine particles (clay and silt) at the westerly stations which receive input from Pearl Harbor and Keehi Lagoon. This may provide an explanation for the larger number of tubicolous worms which use fine particles for tube building. A larger proportion of coarse and fine sand were present in east Mamala sediments and may have partially determined the polychaete communities at those sites. There is not enough data for the CHN and N signature analyses to provide definitive results, but preliminary information does not implicate the outfall as a major source of nitrogen. Indicator worm abundance seems to be a better measure of food availability as their numbers are highest at the outfall stations (for 40m and 70m). Abundance of the indicator species, Ophryotrocha sp. A, at 70m is elevated at the outfall (B3) and can be attributed to food availability and other appropriate habitat characteristics. Neanthes arenaceodonta is not abundant enough to be a good indicator at 70m at this time, Pionosyllis heterocirrata is so widespread and numerous that it is not a good indicator of sewage enrichment. Capitella capitata is generally more abundant at 40m and only abundant at 70m in the summer, and may be a suitable indicator species. Sensitive species are also candidates for pollution indicators when they are rare or absent from an area. Euchone sp. B may be a sensitive species as it is

The marine debris data included in this dataset are from annual shoreline surveys conducted from 2013 to 2018 at the islands of Midway Atoll (Eastern, Spit, and Sand Islands) in the Northwestern Hawaiian Islands (NWHI) by the NOAA Pacific Islands Fisheries Science Center (PIFSC), Ecosystem Sciences Division (ESD) with funding from Papahanaumokuakea Marine National Monument (PMNM), and NOAA's Marine Debris (MDP) and Damage Assessment Remediation and Restoration (DARRP) Programs. Prior to the surveys in 2013, each shoreline was divided into fixed 300-meter segments and stratified by the cardinal direction the shoreline was facing (e.g., north, south, east, and west). The shorelines of Eastern, Spit, and Sand Islands were divided into 19, 4, and 23 segments, respectively. All segments were surveyed at all islands during the 2013, 2015, and 2016 missions. During the 2014 mission, limited time was available to survey all segments; therefore, the pre-existing segments were randomized, and a subset of the segments were identified as a first- or second-tier priority for each strata. All first- and second-tier priority segments were surveyed in 2014. All first- and second-tier priority segments at Eastern and Spit were surveyed in 2018. During a shoreline survey, field staff flagged the corners of the site and swept the entire survey area for marine debris. Most items found within the survey area >10 cm were collected and, if possible, bagged. Due to operational concerns, metal, glass, and building material were not surveyed or removed. Debris items <10 cm were also collected and bagged if the item could be identified (e.g., bottle caps and lighters were included in the survey, unidentified fragments <10 cm were typically excluded). Additionally, if the debris item was considered large (>1 m) or notable, a GPS waypoint was taken to mark the specific location of the debris, and the item was measured (length and width), recorded on the datasheet, and either bagged, removed, or tagged if the item was too large or hazardous to remove. The survey concluded by walking the perimeter of the survey site with a GPS. Following the survey, bagged and large debris were transported to the operations center for the mission, weighed, and sorted, tallied, and recorded by debris type for each survey. Total weight of all collected debris and the survey area (derived from the GPS tracks) were recorded for each 300-m segment, along with the date since the last debris survey to calculate the accumulation rate. During an extended field season at Midway Atoll in the NWHI in 2012, PIFSC scientists removed all of the marine debris along the shorelines of the islands at Midway Atoll. This represented a "clean slate" and starting point to begin studying the accumulation rate along the shorelines for subsequent years. Accumulation rates are reliable only for Eastern and Spit Islands. The shorelines of Sand Island are cleaned regularly by permanent U.S. Fish and Wildlife Service residents; thus, the debris data recorded by ESD for Sand Island does not represent natural accumulation. The shoreline survey and removal efforts at Midway Atoll have been conducted as a component of ship-based missions to the NWHI, a component of a larger shore-based missions at Midway Atoll, or as a stand-alone shoreline debris removal mission at Midway Atoll.

Field data collection was conducted for the U.S. Army Engineer District, Pacific Ocean, Honolulu (POH), during 23-29 August 2007, in the vicinity of the Natatorium, a World War I memorial in Kapiolani Park, Honolulu, Oahu, Hawaii. Three bottom mounted instruments were deployed to measure waves and currents. A Nortek AWAC (1 MHz) acoustic current profiler was placed seaward of the reef, centered off the Natatorium, in about 5m depth. An RD Instruments ADCP (1.2 MHz) current profiler was mounted on the channel bottom near the entrance, in about 3m depth. The third unit was a Nortek Aquadopp current profiler (2 MHz) was placed in a small hole in the reef, about 35m seaward of the Natatorium pool outer wall in a nominal depth of 1.5m. The first two gauges recorded directional waves and current profiles, the Aquadopp only recorded current profiles. Four inexpensive current drogues (drifters) were designed and built at the CHL Field Research Facility (FRF) that used GPS tracking and radio telemetry for positioning.