Acoustical observations of anthropogenic discharge plumes

1994 ◽  
Vol 95 (5) ◽  
pp. 2802-2802 ◽  
Author(s):  
John R. Proni
Keyword(s):  
Anthropogenic Discharge

scholarly journals Long-term groundwater recharge rates across India by in situ measurements

2018 ◽  
Author(s):  
Soumendra N. Bhanja ◽  
Abhijit Mukherjee ◽  
Rangarajan Ramaswamy ◽  
Bridget R. Scanlon ◽  
Pragnaditya Malakar ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
River Basins ◽  
Base Flow ◽  
Groundwater Abstraction ◽  
Pumping Wells ◽  
Anthropogenic Discharge ◽  
Stressed Region ◽  
Recharge Rates ◽  
Using Data

Abstract. Groundwater recharge sustains groundwater discharge, including natural discharge through springs and base flow to surface water as well as anthropogenic discharge through pumping wells. Here, for the first time, we compute long-term (1996–2015) groundwater recharge rates using data retrieved from several groundwater level monitoring locations across India (3.3 million km2 area), the most groundwater-stressed region globally. Spatial variations in groundwater recharge rates (basin-wide mean: 17 to 960 mm/yr) were estimated in the 22 major river basins across India. The extensive plains of the Indus–Ganges–Brahmaputra (IGB) river basins are subjected to prevalence of comparatively higher recharge. This is mainly attributed to occurrence of coarse sediments, higher rainfall, and intensive irrigation-linked groundwater abstraction inducing recharge by increasing available groundwater storage and return flows. Lower recharge rates (

Effect of Hg in Jiaozhou Bay Waters - Land Transfer Process

2014 ◽  
Vol 955-959 ◽  
pp. 2496-2500 ◽  
Author(s):  
Dong Fang Yang ◽  
Si Xi Zhu ◽  
Feng You Wang ◽  
Xiu Qin Yang
Keyword(s):  
Economic Growth ◽  
Decision Making ◽  
Transfer Process ◽  
Pollution Control ◽  
Seasonal Variations ◽  
Jiaozhou Bay ◽  
River Channel ◽  
Land Transfer ◽  
Anthropogenic Discharge ◽  
Industrial Adjustment

Based on the investigation data of mercury (Hg) in waters in Jiaozhou bay during time peroids of 1979 to 1985 (absent of 1984), this paper tried to analysis the seasonal variations of Hg in Jiaozhou Bay, to reveal the transfer process of Hg, and to provide basis for decision-making of pollution control. Results showed that, there was indistint seasonal variations of Hg content, due to anthropogenic discharge was the major source of Hg, which was not static, but depended on industrial adjustment. The land transfer process of Hg could be divided into three major processes: 1) human discharges of Hg to soil, waters, and atmosphere, etc., 2) Hg is washouted and delivered into streams, and 3) Hg is transferred to ocean via river channel runoff. In order to reconcile economic growth with environmental protection, we should have to improve the use ratio of Hg, and to reduce the discharge load of Hg.

Hydrothermal fluxes of metals to the oceans: a comparison with anthropogenic discharge

1995 ◽  
Vol 87 (1) ◽  
pp. 365-372 ◽  
Author(s):  
Christopher R. German ◽  
Martin V. Angel
Keyword(s):  
Anthropogenic Discharge

Long-term trends in total and anthropogenic discharge of organic and biogenic substances by Russian rivers into the Arctic and Pacific seas

2010 ◽  
Vol 37 (3) ◽  
pp. 361-371 ◽  
Author(s):  
A. M. Nikanorov ◽  
M. P. Smirnov ◽  
O. A. Klimenko
Keyword(s):  
The Arctic ◽  
Biogenic Substances ◽  
Anthropogenic Discharge ◽  
Long Term Trends

scholarly journals Sources and routes from terrestrial exogenous pollutants affect phytoplankton biomass in reservoir bays

2021 ◽  
Author(s):  
R. Y. Hu
Keyword(s):  
Phytoplankton Biomass ◽  
Structural Equation ◽  
Storage Period ◽  
Equation Model ◽  
Total Effect ◽  
Total Contribution ◽  
Soil Release ◽  
Anthropogenic Discharge ◽  
Water Nutrients ◽  
Water Eutrophication

Abstract Reservoir bays, the boundary of terrestrial and water where water fluidity slows down and self-purification ability turn weak, hence they are especially sensitive to terrestrial exogenous pollutants, even resulting in eutrophication. According to N:P, water nutrients types can be divided into N limited, P limited and N + P limited classes. Phytoplankton biomass is represented by chlorophyll a, which is one of the sensitive indicators of water eutrophication. Comprehensively traced non-point pollution from terrestrial exogenous pollutants (fertilizer, soil release, anthropogenic discharge) to water nutrients that happen in reservoir bays is of great significance. This paper identified the dominant environmental variables and nutrients limited types of reservoir bays at storage and discharge periods, constructed partial least squares structural equation model (PLS-SEM) to explore the impacts of terrestrial exogenous pollutants. Results showed that in storage period water contamination mainly came from residential discharge and soil endogenous release, the total contribution rate reached 61%. In discharge period, with the increase of rainfall – runoff erosion, the explanatory ability of land use, topography and landscape pattern to water quality increased, up to 58%. The dominant nutrients limited types of reservoir bays were P limited (35%–47%) and N + P limited (35%–59%) at both stages, N limited situations less than 20% and generally appeared in storage period. Whatever the nutrients limited type was, phosphorus always had a higher effect on phytoplankton biomass. In N limited situation, nitrogen mainly from soil release (total effect = 0.6) and phosphorus from fertilizer (total effect = 0.22) and soil release (total effect = 0.17). In P limited situation, all three sources had almost high effects on nitrogen, phosphorus, and phytoplankton biomass. In N + P limited situation, the anthropogenic discharge was the main source of nutrients and the primary threaten factor for phytoplankton biomass. The approaches employed in this study could be generalized to the other basin and the results were significant to early warning and controlling water eutrophication.

scholarly journals Long-term groundwater recharge rates across India by in situ measurements

2019 ◽  
Vol 23 (2) ◽  
pp. 711-722 ◽  
Author(s):  
Soumendra N. Bhanja ◽  
Abhijit Mukherjee ◽  
R. Rangarajan ◽  
Bridget R. Scanlon ◽  
Pragnaditya Malakar ◽  
...  
Keyword(s):  
Groundwater Recharge ◽  
River Basins ◽  
Base Flow ◽  
Groundwater Abstraction ◽  
Fractured Aquifers ◽  
Anthropogenic Discharge ◽  
Stressed Region ◽  
Recharge Rates ◽  
Using Data

Abstract. Groundwater recharge sustains groundwater discharge, including natural discharge through springs and the base flow to surface water as well as anthropogenic discharge through pumping wells. Here, for the first time, we compute long-term (1996–2015) groundwater recharge rates using data retrieved from several groundwater-level monitoring locations across India (3.3 million km2 area), the most groundwater-stressed region globally. Spatial variations in groundwater recharge rates (basin-wide mean: 17 to 960 mm yr−1) were estimated in the 22 major river basins across India. The extensive plains of the Indus–Ganges–Brahmaputra (IGB) river basins are subjected to prevalence of comparatively higher recharge. This is mainly attributed to occurrence of coarse sediments, higher rainfall, and intensive irrigation-linked groundwater-abstraction inducing recharge by increasing available groundwater storage and return flows. Lower recharge rates (<200 mm yr−1) in most of the central and southern study areas occur in cratonic, crystalline fractured aquifers. Estimated recharge rates have been compared favorably with field-scale recharge estimates (n=52) based on tracer (tritium) injection tests. Results show that precipitation rates do not significantly influence groundwater recharge in most of the river basins across India, indicating human influence in prevailing recharge rates. The spatial variability in recharge rates could provide critical input for policymakers to develop more sustainable groundwater management in India.

scholarly journals Ecology of common bully (Gobiomorphus cotidianas) in the Tarawera and Rangitaiki rivers: Isolation by inland distance or anthropogenic discharge?

2009 ◽  
Vol 43 (4) ◽  
pp. 889-899 ◽  
Author(s):  
Natalie A. Bleackley ◽  
Michael J. Landman ◽  
Nicholas Ling
Keyword(s):  
Anthropogenic Discharge

AOX Levels in the River Rhine: Fifty Percent of Natural Origin?!

1994 ◽  
Vol 29 (3) ◽  
pp. 133-136 ◽  
Author(s):  
Eddo J. Hoekstra ◽  
Ed W. B. de Leer
Keyword(s):  
The Netherlands ◽  
Transport Model ◽  
River Basins ◽  
Anthropogenic Sources ◽  
River Rhine ◽  
Natural Origin ◽  
Rhine Basin ◽  
Anthropogenic Discharge ◽  
Organohalogen Compounds

An AOX transport model is used to distinguish natural and anthropogenic sources of organohalogen compounds in river basins. Application of this model to AOX data of the river Rhine basin in the years 1986 to 1991 shows a constant natural AOX contribution of about 15 µg.l-1 to the total AOX flowing into The Netherlands. The anthropogenic discharge has decreased by 70-95% for the river Rhine basin in this six years resulting in a situation that today 30-70% of the total AOX flowing into The Netherlands at Lobith originates from naturally produced organohalogen compounds.

Effects of anthropogenic discharge and hydraulic deposition on the distribution and accumulation of microplastics in surface sediments of a typical seagoing river: The Haihe River

2021 ◽  
Vol 404 ◽  
pp. 124180 ◽  
Author(s):  
Yang Liu ◽  
JiaoDi Zhang ◽  
Yi Tang ◽  
Yong He ◽  
YuJun Li ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Haihe River ◽  
Anthropogenic Discharge
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