Steps towards modeling nutrient export in coastal Californian streams with a Mediterranean climate

Robinson, T. H.; Leydecker, Al; Keller, Arturo A.; Mélack, John M.

doi:10.1016/j.agwat.2004.09.024

Cited by 19 publications

(19 citation statements)

References 22 publications

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“…For example, the bulk of nutrients delivered to the ocean originate from the agricultural and urban lands in the coastal plane and not from the undeveloped mountainous lands (Beighley et al. , 2004; Robinson et al. , 2005).…”

Section: Resultsmentioning

confidence: 99%

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California¹

Beighley¹,

Dunne²,

Mélack³

2008

J American Water Resour Assoc

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The transport of water, sediment, dissolved and particulate chemicals, and bacteria from coastal watersheds affects the nearshore marine and estuarine waters. In southern California, coastal watersheds deliver water and associated constituents to the nearshore system in discrete pulses. To better understand the pulsed nature of these watersheds, frequency distributions of simulated runoff events are presented for: (1) three land use conditions (1929, 1998, 2050); (2) three time periods (all water years 1989‐2002), only El Nino years (1992, 1993, 1995, 1998); and only non‐El Nino years; and (3) three regions (watershed, uplands, and lowlands). At the watershed scale, there was a significant increase (>200%) in mean event runoff from 1929 to 2050 (0.4‐1.3 cm) due to localized urbanization, which shifted the dominant sources of runoff from the mountains in 1929 (78% of watershed runoff) to the coastal plane for 2050 conditions (51% of watershed runoff). Inter‐annual climate variability was strong in the rainfall and runoff frequency distributions, with mean event rainfall and runoff 66 and 60% larger in El Nino relative to non‐El Nino years. Combining urbanization and climate variability, 2050 land conditions resulted in El Nino years being five times more likely to produce large (>3.0 cm) runoff events relative to non‐El Nino years. Combining frequency distributions of event runoff with regional nutrient export relationships, we show that in El Nino years, one in five events produced runoff ≥2.5 cm and temporary nearshore nitrate and phosphate concentrations of 12 and 1.4 μM, respectively, or approximately 5‐10 times above ambient conditions.

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Section: Resultsmentioning

confidence: 99%

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California¹

Beighley¹,

Dunne²,

Mélack³

2008

J American Water Resour Assoc

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“…In the publication [39], the authors describe the relationship between the type of land use and the amount of nutrients discharged to surface waters. Analysis of the variability of nutrients during the year was conducted, depending upon the occurrence of stormy meteorological conditions.…”

Section: Analysis Resultsmentioning

confidence: 99%

“…Processes such as the uptake of nutrients by plants, surface and point pollution run-off from the area as well as the impact of nutrients on the biological elements of the ecosystem, are analysed in detail. In publication [39], it is also stated that during the growing season, there are changes in the amount of nutrients discharged into surface waters as a result of their uptake by plants from the environment. The participation of plants in the nitrogen cycle in the environment is important and cannot be ignored in the analysis of the seasonal variability of nutrients in surface waters; the same is true of the stage of the season of plant growth, this can also have a significant impact on the amount of nutrients in surface waters throughout the year and this relationship was analysed.…”

Section: Introductionmentioning

confidence: 99%

The flattening phenomenon in a seasonal variability analysis of the total nitrogen loads in river waters

2017

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The flattening phenomenon in a seasonal variability analysis of the total nitrogen loads in river waters Zjawisko wypłaszczenia podczas sezonowej zmienności azotu ogólnego w powierzchniowych wodach płynących Abstract This article shows the results of analyses conducted of the seasonal variability of nitrogen concentrations and loads, depending on plants growing season, this doesn't seem to work, consider changing to something like ' dependent upon the stage of the plant growing season, ' if that is what you mean as well as river flow and the precipitation levels in the basins of Middle Warta, Reda and Rega. The Macromodel DNS/SWAT, implemented for three basins, has been calibrated in calculations profiles of three river basins this is vague and unclear, the repetition of 'three (river) basins' is particularly confusing. The analysis confirmed the significant impact of cover crops on the retention of water and nutrients. The phenomenon of periodic decreases and stabilisation of nitrogen concentrations and loads in the surface waters flowing through the profiles of the enclosing water body was observed and analysed. The flattening phenomenon analysis of the phenomenon to me, the repetition of 'phenomenon' is confusing, you could clarify this by defining the second use of 'phenomenon' by, for example, inserting ' of these decreases and stabilisation' here can be used to assess the state of the ecosystem in the basin area.Keywords: water pollution, environmental analysis, nutrients, bioaccumulation, nonpoint sources Streszczenie W artykule przedstawiono wyniki analiz sezonowej zmienności azotu ogólnego w zależności od sezonu wegetacyjnego, a także przepływu rzeki i wielkości opadów występujących na zlewni środkowej Warty, Redy i Regi. Do tego celu został wykorzystany Makromodel DNS/SWAT, który został skalibrowany dla profili ujściowych wybranych zlewni. Przeprowadzona analiza potwierdziła znaczący wpływ roślin okrywowych na retencję wody i składników odżywczych. Zaobserwowano okresowe zmniejszanie się stężenia azotu w powierzchniowych wodach płynących. Zaobserwowane zjawisko może zostać wykorzystane do oceny stanu ekosystemu w obszarze dorzecza, a także umożliwia ocenę rzeczywistego wpływu zarządzania zlewnią na cykl azotu.Słowa kluczowe: energetyczne wykorzystanie biogazu 138

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“…This simple approach is based on the idea that the nutrient load exported from a catchment is the sum of the losses from individual sources and on the assumption that, for a given climate, specific land-use will yield characteristic quantities of nitrogen and phosphorus to a receiving water body (Robinson et al 2005). The estimation of the EC for drained peat soils has been performed by means of statistical model MESAW (Grimvall & Stâlnacke 1996), which was elaborated for source apportionment of the riverine transport of pollutants.…”

Section: Detailed Investigations Have Been Performed At the Rivermentioning

confidence: 99%

The influence of drained peat soils on diffuse nitrogen pollution of surface water

Vassiljev

Blinova

2012

Hydrology Research

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Eutrophication caijsed by excess nutrient loads is the main problem for Estonian surface waters.Even after the (jrastic (decrease in the application of mineral fertilizers at the beginning of the 1990s, the concentrations of nitrogen and phosphorus in many rivers remained at undesirable and unexpectedly high levels. The investigation showed that (drained peat soils are an important source of nitrogen export to the surface waters. Runoff of nitrogen from (drained peat soils is, on average, 1.5-fold higher than from agriculturai lands in Estonia.

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Steps towards modeling nutrient export in coastal Californian streams with a Mediterranean climate

Cited by 19 publications

References 22 publications

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California¹

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California¹

The flattening phenomenon in a seasonal variability analysis of the total nitrogen loads in river waters

The influence of drained peat soils on diffuse nitrogen pollution of surface water

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Steps towards modeling nutrient export in coastal Californian streams with a Mediterranean climate

Cited by 19 publications

References 22 publications

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California1

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California1

The flattening phenomenon in a seasonal variability analysis of the total nitrogen loads in river waters

The influence of drained peat soils on diffuse nitrogen pollution of surface water

Contact Info

Product

Resources

About

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California¹

Impacts of Climate Variability and Land Use Alterations on Frequency Distributions of Terrestrial Runoff Loading to Coastal Waters in Southern California¹