6,248 research outputs found
Estimation of long-term series of total nutrient loads flowing into a large perialpine lake (Lake Como, Northern Italy) from incomplete discrete data by governmental monitoring
No full textContinuous series of nutrient loads released into a water body are essential for nutrient budgeting, water quality modelling and watershed management activities. A quintessential example of pursued data are the series of total nutrient loads flowing from multiple tributaries into a lake. However, except for extraordinary cases in which high-frequency monitoring (HFM) stations are installed for both discharge and concentrations, measured nutrient loads are available on a discrete basis. Such observations are typically obtained by governmental agencies for environmental monitoring purposes, with an at best monthly resolution, yet commonly with gaps spanning years. Usually, monitoring activities are limited to major inflows, neglecting minor ones. However, the latters can play a more relevant role in nutrient load budgets than in hydrological ones, in response to different natural features and pollution among tributary watersheds. In this work, we present a methodology we developed to estimate long-term series of total nutrient loads flowing into a water body, employing as case study Lake Como, a large deep lake in the Italian Alps with manifold monitored and unmonitored tributary watersheds. The method uses observed long-term relationships between discharges and concentrations (Q – C) and available discharge measurements and hydrological estimations to estimate continuous load series for the monitored basins. For the unmonitored watersheds, Q – C relationships are estimated from those of the monitored basins, given the observed dependence of the power-law coefficients on basin hydromorphological parameters. This equals to extending the regionalisation approach applied in hydrology for rainfall and discharges to the ecohydrological field for nutrient load estimation. The application of the method to the case study led to overall annual load estimations congruent to traditional techniques and revealed interesting Q – C watershed dynamics at interannual time scales which could not be disclosed through previous approaches. This work represents an exploratory development and application of ecohydrological regionalisation techniques, whose future development is fostered
The Scripps Family\u27s San Diego Experiment
No full textMolly McClain is an associate professor in the department of history at the University of San Diego and co-editor of The Journal of San Diego History. She is the author of “The Bishop’s School, 1909-2009,” in the Fall 2008 issue of this Journal. This article forms part of a forthcoming biography of Ellen Browning Scripps. Special thanks to Judy Harvey Sahak, Dorran Boyle, Colin Fisher, Scripps College, the La Jolla Historical Society, and the San Diego History Center
The San Diego River: A Natural, Historic, and Recreational Resource
No full textThe purpose of this Article is to briefly consider the historical importance of the San Diego River, to examine the water quality challenges impacting the River today, and to analyze the principal regulatory programs administered by the Regional Board to meet these challenges. The author\u27s premise is that the water quality of the River is essential to its functional integrity and future
USD News Scrapbook 1971-01
No full textScrapbook of University of San Diego newspaper clippings covering topics such as Author Hughes\u27 inauguration as president, athletics, the School of Law, the San Diego Mission excavation, and campus events. Clippings in this scrapbook are arranged chronologically. Bookmarks have been added to the PDF for direct access to specific dates. While Optical Character Recognition (OCR) has been performed on this PDF, the condition of the scrapbooks limits the reliability. Researchers are not advised to rely on OCR to find articles on specific topics.https://digital.sandiego.edu/newsscrapbooks/1007/thumbnail.jp
A History of Catholic School Education in San Diego County, California, from 1850 to 1936
No full textThe purpose of this dissertation was to research, present, and thus to preserve, information concerning Catholic school education in San Diego County from 1850 to 1936. The historical method of research was the research methodology utilized in the study, in which the author primarily investigated original documents stored in religious archives. The author details the thirteen Catholic schools that came into existence during the time period; describes the background and arrival in San Diego County of the seven religious communities that conducted the various schools; and portrays the early leaders responsible for the growth and development of Catholic education in San Diego County. It was noted in the dissertation that Catholic schools gained a foothold in San Diego County in the 1880\u27s largely through the initiative of Father Anthony Dominic Uback, pastor of San Diego from 1866 to 1907. This Catholic leader was responsible for securing the first religious community of women to teach in San Diego County, the Sisters of St. Joseph of Carondelet, an influential community who would conduct seven of the first nine Catholic schools to open in the County. Until 1936, San Diego County formed a part of either the Diocese of Monterey or of Los Angeles, and it was concluded that, in comparison to the rest of the Diocese, Catholic education developed slowly in San Diego County. Indeed, prior to 1900, there existed only one private school for Catholics, the Academy of Our Lady of Peace, and three schools for Indians. It was not until 1912 that the first diocesan school opened in San Diego County. Nevertheless the Catholic schools instituted during the eighty-six year period under investigation were widely dispersed throughout the County, from San Ysidro in the south, Fort Yuma in the east and San Luis Rey in the north. The dissertation may serve as a valuable contribution to the study of Catholic educational history in San Diego County. Furthermore, a better understanding of contemporary Catholic education is gained throughout the background of historical research documented in the study
Diego Gracián de Alderete: The Clandestine Author of the Diálogo de los pajes
No full text[Resumen] Este estudio propone que Diego Gracián de Alderete, bajo el seudónimo de Diego de Hermosilla, fue el autor del Diálogo de los pajes. La afirmación se cimenta en un perfil del autor creado a partir de las referencias históricas, literarias y sociales vertidas en el texto, y se apoya en fuentes inexploradas o no contrastadas hasta ahora.[Abstract] This study argues that Diego Gracián de Alderete, under the pseudonym Diego de Hermosilla, was the author of the Diálogo de los pajes. The claim is founded on an author’s profile generated from the historical, literary, and social references presented in the text, and it is supported by sources not explored or contrasted before
Fuerte de San Diego: Museo Histórico de Acapulco,Guerrero
No full textEl texto de esta miniguía está basado en los trabajos de José Gorbea Trueba, Ernesto García y de Moraga y en la Guía oficial del Museo Histórico de Acapulco, fuerte de San Diego.Debido al terremoto de 1776 se derrumbó el original Fuerte de San Diego -que había funcionado por más de 1 50 años, por ello se construyó una nueva fortaleza que heredó el nombre de la primera. Esta, que quedó edificada en 1783, perdura hasta nuestros días. El edificio es único por su diseño, en él se aplicaron los conceptos arquitectónicos más adelantados de la época, esta característica lo convierte en obra maestra de la ingeniería militar de todos los tiempos. Su planta, de forma pentagonal, permite la autodefensa por todos los flancos, además la rodea un foso seco. Podía alojar a dos mil hombres con provisiones y municiones para un año, ya que cuenta con un eficiente sistema para captar, concentrar y conservar el agua de lluvia y numerosas salas abovedadas alrededor del patio central. El conjunto tiene una superficie de 9 000 m2. Después de que cumplió su cometido como guardián de Acapulco y del Galeón de Manila se le asignaron distintos usos, hasta que en 1986 se le erigió sede del Museo Histórico de Acapulco.</p
Diego Gracián de Alderete: the clandestine author of the Diálogo de los pajes
No full textThis study argues that Diego Gracián de Alderete, under the pseudonym Diego de Hermosilla, was the author of the Diálogo de los pajes. The claim is founded on an author’s profile generated from the historical, literary, and social references presented in the text, and it is supported by sources not explored or contrasted before
Recent trophic changes in lake pusiano (northern Italy) with particular reference to the influence of hydrodynamics on the zooplankton community
No full textLake Pusiano (northern Italy) has been subjected for more than 20 yr to increasing eutrophication which caused hypereutrophic conditions in the mid-1980s. Due to the introduction of a sewage-treatment network in 1986, the total P concentration in the lake water dropped from 185 μg1-1 in 1985 to 74 μg1-1 in 2003. Although there was a reduction in nutrient load, cyanobacteria blooms were observed from 1994 onwards. The aim of this study was to compare physical and chemical parameters and the zooplankton community between two investigation periods (February-December 2002 and January 2003-February 2004) that were separated by an extreme flood event in November 2001 affecting the total plankton community. From the analysis of the data sampled in 2002-2003, an increase in transparency (from 3.5 m to 5.7 m) and a decrease in chlorophyll α concentration (from 6 μg1-1 to 1.5 μg1-1), both measured during the circulation period (December-February), were recorded. Within the phytoplankton, a shift from cyanobacteria to chlorophytes was detected. The zooplankton community changed in the composition of species, that is a higher number of species known to be less tolerant to toxic cyanobacteria were observed. The results emphasise that the flood event at the end of 2002 accelerated the process of reoligotrophication in the lake and contributed to an increased diversification of the zooplankton community. The generally increasing frequency of occurrence of flooding events following heavy rainfalls might be considered a major factor in regulating plankton community composition in the future
Assessing Nutrient Reference Conditions in an Italian Sub-alpine Watershed using Multiple Approaches
No full text- …
