Digital Commons Network^™

An Assessment Of Historical And Future Bluff Recession In Puget Sound, Wa, Callie Little

WWU Graduate School Collection

Sea level rise in the coming century is projected to cause substantial changes along the world’s coastlines and adverse effects to communities and environments. Among these changes, questions about the extent, rate, and uncertainty of coastal bluff retreat relative to historical observations and in response to sea level rise are critical to evaluate. Coastal bluffs comprise ~43% of the shoreline across Puget Sound in the Salish Sea and their recession is a growing concern to human safety, property, infrastructure, and diverse ecosystem services for culturally and commercially important fisheries. This project assesses bluff erosion using field observations, structure from motion …

A Model For Designing Surface Drainage Systems In Nearly Level Agricultural Lands, Rafael Maria Rojas

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The increasing demand for reclamation of periodically waterlogged nearly level agricultural lands in humid tropical areas and the hazard of soil deterioration and soil moisture balance disturbances by current land forming methods suggests the need for investigations of new surface drainage design procedures. This report presents a rainfall-runoff model for simulating hydrographs from ungaged agricultural plots. The model is based on routing procedures and utilizes common soil and hydrologic data. Tests made with several small agricultural water-sheds indicate that the model could be a useful tool in simulating surface drainage design.

Input data for the model consists of (a) rainfall …