The influence of impoundments on riverine nutrient transport: An evaluation using the Soil and Water Assessment Tool

Bosch, Nathan S.

doi:10.1016/j.jhydrol.2008.03.012

Cited by 72 publications

(64 citation statements)

References 51 publications

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“…Additionally, high rates of biological activity and an environment favorable to microbial denitrification, should result in a further decrease in N output via surface runoff. SWAT modeling work on the Huron and Raisin watersheds in southeastern Michigan indicates that impoundments have a substantial effect on riverine nutrient export (Bosch 2008), and David et al (2006) show that a reservoir in Illinois removed 58% of the NO 3 passing through it over the 23-year period of record. Other studies addressing watershed N dynamics have shown that temperature and hydrology are important factors influencing watershed N retention and removal Schaefer and Alber 2007;Sobota et al 2009).…”

Section: N Export and Retentionmentioning

confidence: 99%

Nitrogen export by surface runoff from a small agricultural watershed in southeast China: seasonal pattern and primary mechanism

Chen

Hong

2010

Biogeochemistry

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The seasonal pattern and primary mechanism of nitrogen (N) export by surface runoff from the Wuchuan subwatershed (WCW), an agricultural upper watershed (1.88 km 2 ) located in southeast China, were investigated based on extensive streamwater measurements in 2004-2005 under subtropical climatic conditions. The results disclosed a highly variable but strong linkage between hydrological and anthropogenic controls and N export. N export via surface runoff presented a significant seasonal pattern caused by changes in rainfall and watershed N input. Approximately 75% of the annual N export (67 kg ha -1 ) was flushed by those storm runoff mainly occurred during the wet season (March through September). The WCW dataset of N concentrations and loads during both baseflow and stormflow implied an interactive effects of anthropogenetic N input and hydrology conditions: N export was flush-driven in late spring, summer and autumn (wet season), but highly related with soil N in winter and early spring. Compared to undisturbed watersheds under similar rainfall conditions, WCW exported a considerable amount of N due to intensive fertilizer application (a mean of 690 kg N ha -1 year -1 , commonly as surface applications). This work provides a first characterization of a small agricultural Chinese catchment under subtropical climates and its associated N export behavior.

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Section: N Export and Retentionmentioning

confidence: 99%

Nitrogen export by surface runoff from a small agricultural watershed in southeast China: seasonal pattern and primary mechanism

Chen

Hong

2010

Biogeochemistry

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“…The first paper described a catchment-scale budgeting approach, which showed that the more heavily impounded Huron watershed retained a larger proportion of the N and P inputs than it received compared to the less-impounded Raisin (Bosch and Allan 2008). Second, an application of the Soil and Water Assessment Tool (SWAT) model to the Huron and Raisin watersheds (Bosch 2008) predicted that annual river exports of TP and TN from the Huron watershed were respectively 41 and 54% below that expected in the absence of impoundments. Furthermore, model scenario runs predicted that more numerous smaller impoundments near nutrient sources were most effective at nutrient removal.…”

Section: Potential Management Implicationsmentioning

confidence: 99%

“…The studies by Kelly (2001) and Reid and Hamilton (2007) highlighted this variability, finding that some impoundments acted as net sinks and others as net sources of N and P. In a global review of N removal in impoundments, Harrison et al (2009) reported a range of estimates spanning from 0% to over 100% across the 115 impoundments included in their analysis. Taking measured removal rates of individual impoundments and scaling the cumulative effect of impoundments to the watershed level is a current area of research (Bosch 2008), but further direct estimates of nutrient fluxes across impoundments are warranted.…”

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confidence: 99%

“…Previous work in these two watersheds showed that impoundments could substantially reduce nutrient loads to downstream waters, as inferred by a watershed budget evaluation (Bosch and Allan 2008) and by a modeling study (Bosch 2008). We investigated the role of impoundments through a spatiallyextensive sampling approach covering multiple impoundments and stream reaches across both watersheds to identify locations and rates of nutrient removal.…”

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confidence: 99%

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Nutrient fluxes across reaches and impoundments in two southeastern Michigan watersheds

Bosch

Johengen

Allan

et al. 2009

Lake and Reservoir Management

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“…The large amounts of rainfall during the rainy season could drive the fine fraction, dissolved organic matter and terrestrial plants from the mountain slopes into the reservoir, possibly enhancing the input, which has been observed in other studies (Bosch 2008;Guo et al 2008). The low temperature during the dry season may be associated with the decrease in the biomasses of organisms carrying less terrestrial organic matter to the reservoir and subsequently weakening the organic carbon storage.…”

Section: Seasonal Variation Of Sediment Organic Carbonmentioning

confidence: 54%

Spatial and seasonal dynamics of organic carbon in physically fractioned sediments associated with dam construction in the middle Lancang-Mekong River

et al. 2015

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Purpose Dam construction alters hydrological conditions, impacting the sedimentary environment in the reservoir and modifying the regional flow of carbon. This study examined the spatial and seasonal dynamics of organic carbon in sizefractioned sediments to identify the role of physical protection (e.g. burial, aggregation) for preserving carbon and the potential impact of a dam on the mineralization of sedimentary organic carbon in the dammed Lancang-Mekong River. Materials and methods Sediment samples were collected from the Manwan Reservoir, China, in the rainy and dry seasons using a gravitational bottom sampler. One sample was collected from the centre of the river and two samples were collected on the river edges, 5 m away from each bank. Sediments were divided into three size classes of waterstable aggregates by wet sieving, including macroaggregates, microaggregates and silts. The total organic carbon (TOC), labile organic carbon (LOC), total nitrogen (TN) and stable carbon isotope (δ 13 C) were measured to analyse the dynamic features of organic carbon in the sediments. Results and discussion The preservation of organic carbon in the sediments collected from the main stream decreased with an increase in distance from the Manwan dam, while it remained consistently high in the tributaries. The majority of the sediments collected during the rainy season preserved more TOC and TN than the samples collected during the dry season. Because of the increase in the proportion of sands in macroaggregates and microaggregates, the TOC contents decreased. In contrast, silts and clays were not affected and performed well in protecting organic carbon. The sediments in the lacustrine area and forepart of the transition area, with lower δ 13 C and higher C/N values, suggested a mixture of aquatic and agro-ecosystem inputs and led to high proportions of LOC in TOC. Conclusions Dam construction reinforced the carbon sink and role of physical protection in the Manwan reservoir by enhancing fine fraction deposition and organic carbon inputs, especially during the rainy season. The sediments dominated by silts and clays absorbed and preserved more organic carbon than the samples dominated by sands. The majority of the organic carbon buried in the lacustrine area, the forepart of the transition area and the tributaries was protected by microaggregates, silts and clays. With the development of fisheries and agriculture, increasing amounts of labile organic carbon buried in sediments may lead to an increase in the potential for carbon mineralization.

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The influence of impoundments on riverine nutrient transport: An evaluation using the Soil and Water Assessment Tool

Cited by 72 publications

References 51 publications

Nitrogen export by surface runoff from a small agricultural watershed in southeast China: seasonal pattern and primary mechanism

Nitrogen export by surface runoff from a small agricultural watershed in southeast China: seasonal pattern and primary mechanism

Nutrient fluxes across reaches and impoundments in two southeastern Michigan watersheds

Spatial and seasonal dynamics of organic carbon in physically fractioned sediments associated with dam construction in the middle Lancang-Mekong River

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