Richard B. Alexander

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: 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: Water-quality records from two nationwide sampling networks now permit nationally consistent analysis of long-term water-quality trends at more than 300 locations on major U.S. rivers, providing new insight into changes in stream quality during a time of major changes in both terrestrial and atmospheric influences on surface waters.

TL;DR: NiRReLa (Nitrogen Retention in Reservoirs and Lakes) as mentioned in this paper ) is a global model of nitrogen removal from watersheds, which incorporates small lakes and reservoirs and allows for separate treatment and analysis of reservoirs and natural lakes.