The use of remote sensing and GIS in watershed level analyses of non-point source pollution problems

Basnyat, Prakash; Teeter, L.; Lockaby, B. Graeme; Flynn, K. M.

doi:10.1016/s0378-1127(99)00273-x

Cited by 110 publications

(59 citation statements)

References 12 publications

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“…Depth increases with higher runoff, which in turn brings higher load of nitrate from this agriculture dominated watershed in spring and summer seasons. Nitrate is more associated with the use of organic and inorganic fertilizers [82,83]. Positive loading on total-N has been associated with agricultural runoff [84].…”

Section: Discriminant Analysismentioning

confidence: 99%

Surface Water Quality Assessment of Wular Lake, A Ramsar Site in Kashmir Himalaya, Using Discriminant Analysis and WQI

Bhat

Pandit

2014

Journal of Ecosystems

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Multivariate techniques, discriminant analysis, and WQI were applied to analyze a water quality data set including 27 parameters at 5 sites of the Lake Wular in Kashmir Himalaya from 2011 to 2013 to investigate spatiotemporal variations and identify potential pollution sources. Spatial and temporal variations in water quality parameters were evaluated through stepwise discriminant analysis (DA). The first spatial discriminant function (DF) accounted for 76.5% of the total spatial variance, and the second DF accounted for 19.1%. The mean values of water temperature, EC, total-N, K, and silicate showed a strong contribution to discriminate the five sampling sites. The mean concentration of NO 2 -N, total-N, and sulphate showed a strong contribution to discriminate the four sampling seasons and accounted for most of the expected seasonal variations. The order of major cations and anions was Ca 2+ > Mg 2+ > Na + > K + and Cl − > SO4 2− > SiO 2 2− respectively. The results of water quality index, employing thirteen core parameters vital for drinking water purposes, showed values of 49.2, 46.5, 47.3, 40.6, and 37.1 for sites I, II, III, IV, and V, respectively. These index values reflect that the water of lake is in good condition for different purposes but increased values alarm us about future repercussions.

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Section: Discriminant Analysismentioning

confidence: 99%

Surface Water Quality Assessment of Wular Lake, A Ramsar Site in Kashmir Himalaya, Using Discriminant Analysis and WQI

Bhat

Pandit

2014

Journal of Ecosystems

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“…Although NO 3 -N in the natural waters is the most abundant nitrogen species and usually has low concentrations (Basnyat et al, 2000), agricultural activities, which are often related to excess fertilizer application lead to increased levels of this nutrient in-stream (Basnyat et al, 2000;Bellos et al, 2004;Herlihy et al, 1998;Johnson et al, 1997). In rural areas like this study site, the Teshio river basin, agricultural land use can be of a great importance to the aquatic 5 ecosystems condition.…”

mentioning

confidence: 93%

“…The fast development of the Geographic Information System (GIS) and the ready availability of land use data favored their incorporation into a large number of environmental studies; predominantly studies investigating the relationship between land use and water quality (Allan et al, 1997;Basnyat et al, 2000;Herlihy et al, 1998;Maillard, 2007;Pan et al, 2004;Rodriguez et al, 2007;Wang and Yin, 1997;Williams et al, 2005). Landscape indicators at the scale of the local riparian zone, as well as the scale of the entire catchment have been proven to be useful predictors of water chemistry variables (Ahearn et al, 2005;Johnson et al, 1997;Osborne and Wiley, 1988;Strayer et al, 2003;Williams et al, 2005).…”

mentioning

confidence: 99%

Relationship between the riverine nitrate–nitrogen concentration and the land use in the Teshio River watershed, North Japan

et al. 2009

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The present research investigated the relationship between nitrate-nitrogen (NO 3 -N) in river water and the land use/land cover (hereafter land use) in Teshio river watershed located in northern Hokkaido island to understand the effect of human activities such as agriculture, forestry, industry and urbanization in the drainage basin on the river ecosystem quality and services. River water was sampled at nine points seasonally during a two-year period and nutrients concentration was measured. Land use profiles were estimated at two spatial scales-riparian and sub-catchment for each sampling station. The spatial pattern of water quality in the Teshio River showed increased NO 3 -N levels associated with the agriculture and urban expansion, and forest reduction in the watershed. Land use at the riparian scale closely reflected that at the sub-catchment scale, which masked the unique riparian buffer effect on the river water condition. The high agricultural and reduced forest area in the riparian 2 zone, especially in the upper middle reach, could be a possible reason for the decline of ecosystem service for provisioning of clean water and habitat for aquatic organisms.Measures towards sustainable and more nature-friendly agricultural management are necessary in the area to protect the Teshio river ecosystem and its ecosystem services.

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“…A first-order rate equation can be used for modeling nutrient attenuation in flow through various land uses to the nearest stream (Phillips, 1989). Thus in most cases, the concentration of nutrients or total suspended solids ( NPS i ) at a sample point received from a basin i, can be described in the form of an exponential model (Fetter 1994;Basnyat et al, 1999;Basnyat et al, 2000) NPS . Based on the linkage model, multiple regression models were applied to each of water quality variables: total nitrogen, nitrate, total phosphorous, phosphate, chemical oxygen demand and dissolved oxygen, respectively.…”

Section: An Exponential Modelmentioning

confidence: 99%

Assessment of the Impact of Land-Use Types on the Change of Water Quality in Wenyu River Watershed (Beijing, China)

Zhang¹,

Wang²

2012

International Perspectives on Global Environmental Change

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The use of remote sensing and GIS in watershed level analyses of non-point source pollution problems

Cited by 110 publications

References 12 publications

Surface Water Quality Assessment of Wular Lake, A Ramsar Site in Kashmir Himalaya, Using Discriminant Analysis and WQI

Surface Water Quality Assessment of Wular Lake, A Ramsar Site in Kashmir Himalaya, Using Discriminant Analysis and WQI

Relationship between the riverine nitrate–nitrogen concentration and the land use in the Teshio River watershed, North Japan

Assessment of the Impact of Land-Use Types on the Change of Water Quality in Wenyu River Watershed (Beijing, China)

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