"Large Woody Debris". Large tree trunks, branches or pieces of woody plant material.
Logging While Drilling. Refers to the technology that records (logs) characteristics while drilling. This information provides the client with more accurate real-time information about the surrounding geology, leading to more informed decisions on well path trajectory and reservoir characteristics.
low water datum. (1) The geopotential elevation (geopotential difference) for each of the Great Lakes and Lake St. Clair and the corresponding sloping surfaces of the St. Marys, St. Clair, Detroit, Niagara, and St. Lawrence Rivers to which are referred the depths shown on the navigational charts and the authorized depths for navigation improvement projects. Elevations of these planes are referred to IGLD (1955) and are Lake Superior 600.0 feet, Lakes Michigan and Huron 576.8 feet, Lake St. Clair 571.7 feet, Lake Erie 568.6 feet, and Lake Ontario 242.8 feet. (2) An approximation of mean low water that has been adopted as a standard reference for a limited area and is retained for an indefinite period regardless of the fact that it may differ slightly from a better determination of mean low water from a subsequent series of observations. Used primarily for river and harbor engineering purposes. Boston low water datum is an example.
LARGE WOODY DEBRIS. Conifer or deciduous logs, limbs or root wads twelve inches or larger in diameter.
Large Woody Debris. Logs, stumps, or root wads in the stream channel, or nearby. These function to create pools and cover for fish, and to trop and sort stream gravels.
large woody debris. Woody debris in a stream, lake or wetland setting, during at least part of the year, with a diameter of 10 cm or greater and a length of two metres orĀ greater.
low water datum. The geopotential elevation (geopotential difference) for each of the Great Lakes and the corresponding sloping surfaces of the St. Mary's, St. Clair, Detroit, Niagara, and St. Lawrence Rivers to which are referred the depths shown on the navigational charts and the authorized depths for navigation improvement projects. Elevations of these planes are referred to IGLD (1985) and are Lake Superior - 183.2 metres, Lakes Michigan and Huron -176.0 metres, Lake St. Clair - 174.4 metres, Lake Erie - 173.5 metres, and Lake Ontario - 74.2 metres.
Large woody debris. Logs, limbs, or root wads 4 inches or larger in diameter, delivered to river and stream channels from streamside forests (in the riparian or upslope areas) or from upstream areas. LWD provides streambed stability and habitat complexity. LWD recruitment refers to the process whereby streamside forests supply wood to the stream channel to replenish what is lost by decay or downstream transport.