Richard B. Alexander

TL;DR: It is concluded that the proximity of sources to large streams and rivers is an important determinant of nitrogen delivery to the estuary in the Mississippi basin, and possibly also in other large river basins.

TL;DR: A spatially explicit and structurally detailed SPARROW water-quality model reveals important differences in the sources and transport processes that control nitrogen (N) and phosphorus (P) delivery to the Gulf of Mexico and indicates the diversity of management approaches required to achieve efficient control of nutrient loads.

TL;DR: In this article, the authors describe a method for using spatially referenced regressions of contaminant transport on watershed attributes (SPARROW) in regional water quality assessment. But the method is designed to reduce the problems of data interpretation caused by sparse sampling, network bias, and basin heterogeneity.

TL;DR: This work reviews current watershed research and uses a water-quality model to investigate headwater influences on downstream receiving waters, and applies the spatially explicit, mass-balance watershed model SPARROW to consider transport and transformations of water and nutrients throughout stream networks in the northeastern United States.

TL;DR: In this article, the authors summarized and examined some of the major issues and choices involved in detecting and estimating the magnitude of temporal trends in measures of stream water quality, including the type of trend hypothesis to examine: step trends versus monotonic trend.