Contribution of nitrogen and phosphorus by precipitation in the drainage basin of the Santillana Reservoir (Madrid)

1994 ◽  
Vol 23 (2) ◽  
pp. 99-104 ◽  
Author(s):  
B. Lacalle Pareja ◽  
C. G�mez Artola ◽  
F. L�pez Vera
Keyword(s):  
Drainage Basin ◽  
Nitrogen And Phosphorus

Modeling water and nutrients fluxes in the Büyük Menderes drainage basin, Turkey

2009 ◽  
Vol 59 (3) ◽  
pp. 531-541 ◽  
Author(s):  
Ö. F. Durdu ◽  
V. Cvetkovic
Keyword(s):  
Point Source ◽  
Drainage Basin ◽  
Temporal Distribution ◽  
Aegean Sea ◽  
Nitrogen And Phosphorus ◽  
Industrial Sectors ◽  
Modeling Process ◽  
Nutrient Emissions ◽  
Catchment Modeling ◽  
River Loads

Büyük Menderes catchment, located in the southwestern part of Turkey, is one of the most populated river basins in Turkey with 2.5 millions inhabitants. Due to increasing activities in agriculture and industrial sectors, water resources management in the basin is one of the biggest matters for the future. During the past decade, it has been observed a basinwide shift to larger monocultural, intensively operated farm units. Therefore, there is land use conversion from native lands to agriculture. The threat of nutrients pollution, nitrogen and phosphorus, has become a preoccupation since many lands and rivers undergo a eutrophication process. The discharge of nutrients from Büyük Menderes basin to the Aegean Sea through Büyük Menderes river also needs to be reduced in order to bring the eutrophication problems under lasting control. In this paper, the PolFlow model embedded in PCraster is applied to the catchment for quantifying water and substances fluxes for the five-year period, 1999–2004. The implementation of the model in the catchment allows describing the water balance and thus nutrient transport on the landscape surface but also through the soil and aquifer's layers. Modeling process is complicated by the transfer of nutrients from diffuse and point-source emissions, managed by retention and periodic release from storages within the catchment. Modeling diffuse and point-source nutrient emissions contribution to river loads can be improved by better knowledge about spatial and temporal distribution of this retention and release in the basin.

The influences of land-use changes on the absorbed nitrogen and phosphorus loadings in the drainage basin of Lake Chaohu, China

2013 ◽  
Vol 71 (9) ◽  
pp. 4165-4176 ◽  
Author(s):  
Tiantian Jiang ◽  
Shouliang Huo ◽  
Beidou Xi ◽  
Jing Su ◽  
Haobo Hou ◽  
...  
Keyword(s):  
Land Use ◽  
Drainage Basin ◽  
Land Use Changes ◽  
Nitrogen And Phosphorus ◽  
Lake Chaohu

scholarly journals Monitoring Wetland Mitigation of Nutrient Contaminants from Container Nursery Offsite Drainage

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 856A-856
Author(s):  
Milton D. Taylor* ◽  
Stephen J. Klaine ◽  
Ted Whitwell
Keyword(s):  
Water Quality ◽  
Nitrogen Removal ◽  
Drainage Basin ◽  
Quality Standard ◽  
Wetland Mitigation ◽  
Production Cycle ◽  
Nitrogen And Phosphorus ◽  
Runoff Water ◽  
Discharge Water ◽  
Nitrate And Nitrite

Container-grown plants from commercial nurseries require large amounts of water and nutrients during their production cycle resulting in substantial runoff contaminated with nitrogen and phosphorus. Thus, mitigation of nutrients from exiting runoff water is a serious concern for horticultural concerns. Wight Nurseries of Monrovia Growers, Cairo, Ga., has installed 3.77 ha of planted wetlands to receive direct runoff in excess of recapture needs from a 48.6 ha drainage basin and excess water diverted from adjacent watersheds. Water flows though trench drains between wetland cells and eventually into stilling ponds before it is allowed to exit the property. Water flow through the wetlands ranges from 1.6 million to 2.2 million liters per day. Two years of monitoring data indicates strong seasonal differences in nitrate and nitrite nitrogen removal efficiencies. Nitrogen removal between April and November averaged 93.3% while removal during winter months averaged 44.1%. Nitrite was not found in wetland discharge water samples. Nitrogen as nitrate in discharge water varied from 0.05 ppm to 4.3 ppm, well below drinking water quality standards, and was below 0.6 ppm between June and November except in September during construction activity. Orthophosphate phosphorus removal was highly variable with highest removal during late spring, averaging 33.6%, and some removal during early fall, averaging 13.8%. However, there was a significant net export of phosphorus from the wetlands during winter months and during periods of low vegetative growth. Phosphorus levels ranged between 0.9 and 1.9 ppm. While there is currently no legal water quality standard, these levels are above the generally accepted level of 0.01 ppm for preventing downstream eutrophication.

scholarly journals (102) Monitoring Nutrient Mitigation at a Container Nursery Wetland: A 3-Year Study

HortScience ◽  
2005 ◽  
Vol 40 (4) ◽  
pp. 1049A-1049 ◽  
Author(s):  
Milton D. Taylor ◽  
Sarah A. White ◽  
Stephen J. Klaine ◽  
Ted Whitwell
Keyword(s):  
Water Quality ◽  
Nitrogen Removal ◽  
Drainage Basin ◽  
Quality Standard ◽  
Production Cycle ◽  
Nitrogen And Phosphorus ◽  
Runoff Water ◽  
Liquid Feeding ◽  
Net Export ◽  
Container Nursery

Container-grown plants require large amounts of water and nutrients during their production cycle. This results in substantial runoff that is contaminated with nitrogen and phosphorus. At our study site, nutrients were delivered through incorporation in the potting media as timed-release prills and through liquid feeding by injection into irrigation water. Mitigation of nutrients in runoff water was dealt with proactively by the container nursery with construction of 3.77 ha of planted wetlands to receive runoff from a 48.6-ha drainage basin and excess water diverted from adjacent watersheds. Water flowed though drains between wetland cells and eventually into stilling ponds before it was allowed to exit the property. Water flow through the wetlands ranged from 1.1 to 3.1 million liters per day over the period. Three years of monitoring data indicate some seasonal differences in nitrogen removal efficiencies. Nitrogen removal between March and November averaged ≥95% while removal during winter (December through February) averaged ≥72%. Nitrogen (as nitrate) varied from 4.28 ppm to ≤0.01 ppm in wetland discharge, well below drinking water quality standards, but occasionally above levels that may cause downstream eutrophication. Orthophosphate phosphorus removal was highly variable with greatest removal occurring during late spring, late fall, and winter. There was a significant net export of phosphorus during some summer months for years 2 and 3. Phosphorus levels in wetland discharge ranged between 0.84 and 2.75 ppm. While there is currently no legal water quality standard for phosphorus, these levels were above the generally accepted level for preventing downstream eutrophication.

scholarly journals ABIOTIC FACTORS AFFECTING THE ECOLOGICAL STATE OF LAKE NERO ACCORDING TO MATHEMATICAL MODELING. 1. NUTRIENT LOAD FROM THE CATCHMENT AREA

2020 ◽  
pp. 19-27
Author(s):  
Sh. Pozdnyakov ◽  
S. Kondratiev ◽  
M. Shmakova
Keyword(s):  
External Load ◽  
Quantitative Assessment ◽  
Drainage Basin ◽  
Abiotic Factors ◽  
Aquatic Area ◽  
Nutrient Load ◽  
Large Area ◽  
Nitrogen And Phosphorus ◽  
Total Load ◽  
Best Available Technologies

Reducing the external load is an uncontested method of reducing the rate of anthropogenic eutrophication of the lake, since the possibilities of real impact aimed at reducing the internal load over a large area are extremely limited. The purpose of this study is a quantitative assessment of the external load of nitrogen and phosphorus on Lake Nero from the drainage basin in modern conditions. The assessment of the nutrient load from the drainage area of Lake Nero was carried out according to the mathematical model of the formation of the nutrient load, developed at the Institute of Limnology of the Russian Academy of Sciences. The model is designed to solve problems related to the quantitative assessment of the external load on water bodies, formed by point and nonpoint sources of pollution, forecast of its change under the influence of possible anthropogenic and climatic changes, taking into account the influence of hydrological factors and the retention of nutrients by the catchment and the hydrographic network. It was found that the load on the aquatic area from the catchment is 51.5 t P / year and 585.5 t N / year, of which 36.0 t P / year (70% of the total load on the lake) and 176.5 t N / year (30%) go directly to lake from coastal settlements. Provided that the entire population is connected to treatment facilities and the introduction of best available technologies (BAT) for agriculture, according to a numerical experiment, the load will decrease by 23% for total phosphorus and 19% for total nitrogen.

Statistical modelling of riverine nutrient sources and retention in the Lake Peipsi drainage basin

2005 ◽  
Vol 51 (3-4) ◽  
pp. 309-317 ◽  
Author(s):  
A. Vassiljev ◽  
P. Stålnacke
Keyword(s):  
River Basin ◽  
Agricultural Land ◽  
Drainage Basin ◽  
Statistical Modelling ◽  
Point Sources ◽  
Simultaneous Estimation ◽  
Nutrient Loads ◽  
Nitrogen And Phosphorus ◽  
Lake Peipsi ◽  
Nutrient Sources

Implementation of the Water Framework Directive calls for methodologies and tools to quantify nutrient losses from diffuse sources at a river basin district scale. Here, we examine the possibility of using a statistical model for source apportionment and retention of nutrients in a large transboundary drainage basin (44,000 km2). The model approach uses non-linear regression for simultaneous estimation of e.g. source strength, i.e. export coefficients to surface waters, for the different specified land-use or soil categories and retention coefficients for pollutants in a drainage basin. The model was tested on data from 26 water quality stations with corresponding sub-basin data, i.e., land cover, point sources and atmospheric deposition, from the Estonian part of the Lake Peipsi drainage basin. The model showed that it was statistically possible to derive reliable export coefficients (i.e. unit-area loads) for nitrogen on agricultural land and forests. Moreover, it was shown with simple empirical functions that lake retention was approximately 30-35% for both nitrogen and phosphorus and that the riverine retention was low for both nitrogen and phosphorus (approx. 10%). Results show that the MESAW model is a simple and powerful tool for simultaneous estimation of sources and retention of nutrient loads in a river basin.

Sign in / Sign up

Export Citation Format

Share Document