caa a22 4500 469029420 CHVBK 20180323132739.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF00399686 doi (NATIONALLICENCE)springer-10.1007/BF00399686 Estimation of nonpoint source loadings with data obtained from limited sampling programs [Elektronische Daten] [Lorin Reinelt, Anders Grimvall] The feasibility of estimating nonpoint source loadings with data obtained from limited sampling programs was analyzed in conjunction with a study of sediment and nutrient loadings in a Swedish river basin. The study showed that different loading estimation methods can yield significantly different results, even if sampling during events (e.g. peak flows) occurs. This was particularly true for the temporal distribution of the estimated loadings. The estimated spatial distribution of loadings in the monitored subbasins was more independent of the applied estimation technique. Theoretical calculations showed that sampling strategies with evenly spaced sampling intervals may systematically over- or underestimate the true loading. The study basin was characterized by a pronounced snowmelt period and partly erosion-controlled nutrient loadings. Guidelines for the estimation of nonpoint loadings in such basins are summarized in a matrix. Factors influencing the choice of estimation method include the characteristics of the collected data, the relative influence of point sources, and the desired detail of loading estimates. Possible correlations between flow and concentration, and the presence of extreme events (and whether or not the events were sampled), also determine the appropriateness of the different methods. Kluwer Academic Publishers, 1992 Reinelt Lorin Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden aut Grimvall Anders Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden aut Environmental Monitoring and Assessment Kluwer Academic Publishers 21/3(1992-06-01), 173-192 0167-6369 21:3<173 1992 21 10661 https://doi.org/10.1007/BF00399686 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00399686 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Reinelt Lorin Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden aut NATIONALLICENCE 700 1- Grimvall Anders Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 21/3(1992-06-01), 173-192 0167-6369 21:3<173 1992 21 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer