نتایج جستجو برای: especially flowing waters
تعداد نتایج: 439633 فیلتر نتایج به سال:
The rover Opportunity has investigated the rim of Endeavour Crater, a large ancient impact crater on Mars. Basaltic breccias produced by the impact form the rim deposits, with stratigraphy similar to that observed at similar-sized craters on Earth. Highly localized zinc enrichments in some breccia materials suggest hydrothermal alteration of rim deposits. Gypsum-rich veins cut sedimentary rocks...
The tropical-subtropical caddisfly genus Ugandatrichia Mosely (Hydroptilidae) is recorded from Japan for the first time, with 2 species. Ugandatrichia nakijinensis Ito sp. nov. is described from Okinawa-jima and Amami-oshima, in the south of Japan, based on adults and immature stages. Ugandatrichia taiwanensis Hsu and Chen, originally described from Taiwan, is recorded and redescribed based on ...
A new design of equilibrator for carbon dioxide monitoring in natural waters is described. It consists in a vertical tube filled with marbles through which water is flowing while equilibrating with a closed air circuit. It offers several advantages compared with classical equilibrators, among which is a fast response time (half-life constant approximately 30 s) and the potential to work in very...
Nitrate in surface (187 samples) and ground (126 samples) waters collected in Sardinia (Italy) shows a large range of concentrations: from <1 to 249 mg/L. The highest median value of nitrate occurs in groundwater samples, especially in shallow wells, and spring waters circulating in granite environments. In surface waters, nitrate generally increases as flow increases following intense precipit...
Based on monthly monitoring data of unfiltered water, the nutrient discharges of the eight main rivers flowing into the coastal waters of China were calculated from 2006 to 2012. In 2012, the total load of NH3-N (calculated in nitrogen), total nitrogen (TN, calculated in nitrogen) and total phosphorus (TP, calculated in phosphorus) was 5.1 × 10(5), 3.1 × 10(6) and 2.8 × 10(5) tons, respectively...
TEMPORARY STREAMS : THE HYDROLOGY , GEOGRAPHY , AND ECOLOGY OF NON - PERENNIALLY FLOWING WATERS Owen
Temporary streams represent a significant yet understudied and particularly vulnerable portion of river networks. While the vast majority of stream and river research to date has focused on perennial flowing waters, recent work reveals that temporary streams are not only abundant and widely distributed, but also play a significant role in the hydrological and ecological integrity of lotic netwo...
This technical note describes a method for verifying the representativeness of mean-value and extreme-value water quality monitoring locations. Recommended techniques are illustrated using data collected with the total dissolved gas monitoring system on the Columbia and Snake Rivers. This technical note shows how statistical techniques can be applied to the design of monitoring systems to ensur...
ECONOMIC VALUE OF QUALITY IN WATER THE original abundance of water in the state of New York its very commonness, has dulled her people's appreciation of the subtle qualit;y value of their heritage. M\Iomentarily shut off from their supply the cities and industr-ies would instantly realize its vital necessity. Precipitate ruin of the wonderfully rich, living waters of the state would awaken imme...
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