Contribution of diffuse sources to the sediment and phosphorus budgets in Ben Chifley Catchment, Australia

Rahman, Ataur; Bakri, Dhia Al

doi:10.1007/s12665-009-0187-1

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…Other studies have also measured a high proportion of DIP (*65%) relative to TP in rivers (Bramley and Roth 2002;Sherman et al 2001). This contrasts with studies that have shown that TP in rivers is mostly associated with the particulate load (Pailles and Moody 1992;Harris 1999;Sherman et al 2001;Rahman and Al Bakri 2010). Additionally, in a review of nutrient biogeochemistry in Australian rivers, Harris (2001) suggested that the proportion of DIP remains relatively constant across land uses (10-30%), which is at odds with our findings.…”

Section: Discussioncontrasting

confidence: 99%

Sources and fate of nutrients in a subtropical reservoir

Burford

Green

Cook³

et al. 2011

Aquat Sci

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This study examined the sources and fate of nutrient inputs from two principal tributaries to the eutrophic subtropical Wivenhoe reservoir: an unregulated river and a dammed river with regular releases, during a period of declining reservoir water levels. Nutrient budgets were constructed over a period of 6 years, and combined with short-term data on nutrient concentrations and forms, and d 15 N stable isotope data. Our study found that over a 6 year period, there was net retention of phosphorus (P) in the reservoir, with 60% of inputs retained. Most of the P input load came from the unregulated river, with an agricultural catchment, during periods of high flow. During one event half of the total TP load from the unregulated river in the study period was delivered in only 12 days. Much of the P was dissolved inorganic P (DIP) and was derived from high P concentrations in soils and sediments. This highlights the importance of appropriate catchment management practices to reduce P losses from terrestrial systems because retention of P in reservoir sediments reduces the availability of this nutrient for agricultural production. In contrast, there was negligible retention of nitrogen (N). The unregulated river was an important source of N derived from N fixation in the river and adjacent soils, while the source from the dammed river was mostly reprocessed N. The high retention of P relative to N is consistent with relatively higher accumulation of P in sediments.

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Section: Discussioncontrasting

confidence: 99%

Sources and fate of nutrients in a subtropical reservoir

Burford

Green

Cook³

et al. 2011

Aquat Sci

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“…Therefore, the improvement of the water quality of a river is limited, despite the considerable amount of progress that has been made in this area (Rahman and Al Bakri 2010). This situation has arisen because pollutants are induced into a river or a lake in large amounts from unspecified pollution sources known as non-point-pollution sources more than they are from careless management of point-pollution sources, though management of non-point-pollution sources is urgent along with regulations of point-pollution sources in order to improve the overall water quality (Bhardwaj and Singh 2011;Andrea et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Determination of the removal efficiency of a vortex-type facility as a best management practice using the dynamic event mean concentration: a case study of a bridge in Yong-In city in Korea

Kim

Gil

2011

Environ Earth Sci

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Thus far, the removal efficiency of non-pointpollution source removal facilities has been evaluated for individual rainfall events. However, as the removal efficiency for part of a single rainfall event has not been evaluated, adapting the removal facilities for these concentrations is imprecise. Of 18 rainfall events, the removal efficiency of a vortex-type facility as a BMP (Best Management Practice), a non-point-pollution source removal method, was assessed in this study in four assessment techniques and analyzed. In addition, the efficiency was assessed for the concentration using dynamic EMC (Event Mean Concentration). At a higher concentration, the efficiency becomes higher in terms of the TSS, COD, and TP results. In the case of TP, the concentration range of 0*2 mg/L showed the highest efficiency. In the case of Zn, low efficiency was shown in a concentration range of 0.2*0.6 mg/L.

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Simulation of spatial and temporal distribution on dissolved non-point source nitrogen and phosphorus load in Jialing River Watershed, China

Long

Cooper

2011

Environ Earth Sci

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Jialing River, which covers a basin area of 160,000 km 2 and a length of 1,280 km, is the largest tributary of the catchment area in Three Gorges Reservoir Area, China. In recent years, water quality in the reservoir area section of Jialing River has been degraded due to land use and the rural residential area induced by non-point source pollution. Therefore, the semi-distributed land-use runoff process (SLURP) hydrological model has been introduced and used to simulate the integrated hydrological cycle of the Jialing River Watershed (JRW). A coupling watershed model between the SLURP hydrological model and dissolved non-point source pollution model has been proposed in an attempt to evaluate the potential dissolved non-point source pollution load; it enhances the simulation precision of runoff and pollution load which are both based on the same division of land use types in the watershed. The proposed model has been applied in JRW to simulate the temporal and spatial distribution of the dissolved total nitrogen (DTN) and dissolved total phosphorus (DTP) pollution load for the period 1990-2007. It is shown that both the temporal and spatial distribution of DTN and DTP load are positively correlated to annual rainfall height. Land use is the key factor controlling the distribution of DTN and DTP load. The source compositions of DTN and DTP are different, where average DTN pollution load in descending order is land use 67.2%, livestock and poultry breeding 30.5%, and rural settlements 2.2%; and for DTP, livestock and poultry breeding is 50%, land use 48.8%, and rural settlements 1.2%. The contribution rates of DTN and DTP load in each sub-basin indicate the sensitivity of the results to the temporal and spatial distribution of different pollution sources. These data were of great significance for the prediction and estimation of the future changing trends of dissolved non-point source pollution load carried by rainfall runoff in the JRW and for studies of their transport and influence in the Three Gorges Reservoir.

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Contribution of diffuse sources to the sediment and phosphorus budgets in Ben Chifley Catchment, Australia

Cited by 10 publications

References 11 publications

Sources and fate of nutrients in a subtropical reservoir

Sources and fate of nutrients in a subtropical reservoir

Determination of the removal efficiency of a vortex-type facility as a best management practice using the dynamic event mean concentration: a case study of a bridge in Yong-In city in Korea

Simulation of spatial and temporal distribution on dissolved non-point source nitrogen and phosphorus load in Jialing River Watershed, China

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