Research About lahars

Posted On: Filed Under: Biological Research

The effects of the eruptions of Mount St. Helens on glaciers, glacier caves, caves and mudflows, etc.

The objectives of this project are to study effects of eruptions on glaciers and glacier pseudokarst and to map glacier caves and glacier margin and other caves on Mount St. Helens. In meeting these objectives we will document and photograph (1) these features; (2) effects of ashfall and mudflows on newly exposed glacier bed and downslope detritus and erosion produced by melting glaciers; (3) effects on crater, dome and caves in crater.

 

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Posted On: Filed Under: Biological Research

Disturbance and recovery of soil, microbial, and plant processes.

Our work has focused on disturbance and recovery of soil, microbial, and plant processes following volcanic disturbance. Particular emphasis was placed on spatial relationships involving the carbon and nitrogen cycles. Comparative studies have been conducted at six sites that were disturbed to varying degrees by the May 1980 eruption of Mount St. Helens. These sites include Butte Camp, Upper Pine Creek, the Lahar on the Muddy River, the former Timberline parking Area, and Meta Lake.

 

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Posted On: Filed Under: Biological Research

Mortality and revegetation of an old-growth forest buried by the Muddy River mudflow

Natural revegetation was studied in an old growth terrace forest buried by 25 to 150 cm of sand to boulder sized material from the Muddy River mudflow. Objectives were: 1) examine patterns of mortality, growth and revegetation along a gradient of mudflow deposition; 2) provide baseline data for future estimates of fragmentation and decay of mudflow killed trees and assess the influence of the dead trees on revegetation processes; 3) establish a 2.5 hectare grid of stem mapped forest to track ecosystem recovery and describe important processes through time.

 

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Posted On: Filed Under: Biological Research

Natural revegetation of debris avalanche and lahar (mudflow) deposits

Natural revegetation was studied on debris avalanche and mudflow deposits primarily northwest and southeast of Mount St. Helens on Forest Service land. Objectives were: 1) examine patterns of revegetation in response to large and small scale surface changes as deposits are modified by geomorphic processes; 2) characterize revegetation on different types of sites in the devastated area (North Fork Toutle River debris avalanche and Muddy River mudflow) and 3) establish a system of documented permanent plots to track ecosystem recovery and describe important processes through time.

 

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