Geomorphology Commons^™

Evaluating The Relationship Between Methane Seeps And Seafloor Geomorphology On The Northern Us Atlantic Margin, Gabriel Hernandez

Theses and Dissertations

Methane seeps are a transport pathway for carbon from seafloor sediments to the marine environment with important implications for global biogeochemical cycling. Accordingly, there is substantial interest in better understanding the processes that control seep location and predicting the distribution of seeps with existing seafloor datasets. Visual evaluation of methane seeps, in multibeam sonar water column data, suggests a spatial relationship between seeps and specific seafloor morphologic features such as ridge crests. In this thesis, seafloor geomorphology at 1996 seep detection sites on the US Atlantic margin was quantitatively characterized by geomorphologic phonotype, bathymetric position index, slope, rugosity, and aspect …

Rainbow Beach Sediment Grain Size Analysis, Northampton, Massachusetts, Brian Yellen

Data and Datasets

This dataset was prepared by Brian Yellen, a research assistant professor in the Department of Earth, Geographic, and Climate Sciences at the University of Massachusetts Amherst. Dr. Yellen worked in conjunction with Melissa Grader of the USFWS and colleagues to conduct the associated field sampling.

This report provides information related to the substrate grain size at surveyed locations on Rainbow Beach on the Connecticut River in Northampton, MA (42.322125, -72.584928). This location is a known breeding site of the endangered puritan tiger beetle (PTB), Ellipsoptera puritana.

Hydrologic And Geomorphic Investigations Of Two Engineered Stream Crossings Under Interstate 90 In Washington State, Catherine Mast

All Master's Theses

The importance of stream restoration in providing a healthy ecosystem is widely recognized. The Washington State Department of Transportation (WSDOT) has implemented environmental changes to facilitate habitat restoration and wildlife passage along the Interstate 90 Highway (I-90) corridor where it passes over the Cascade Mountains. Prior to the I-90 corridor expansion, Price and Noble Creeks passed under the highway though culverts, limiting passage of aquatic species or wildlife below the highway. In 2019 the stream channel crossings were expanded, and the size/shape of these creeks were engineered to mirror what would be seen in a natural environment. Since construction, erosion …