Global ETD Search

11	Sedimentation in a Tupelo-Baldcypress Wetland 12 Years Following Harvest Distubance Warren, Susan Elizabeth 21 August 2001 (has links) Sediment accumulation and loss were measured in a water tupelo (Nyssa aquatica)- baldcypress (Taxodium distichum) forested wetlandin years 2, 7, 10 and 12 following harvesting disturbance. A 3 X 3 Latin Square design was replicated three times and compared to a psuedo-replicate reference stand (REF). Disturbance treatments were chainsaw fellind of trees with (1) helicopter removal of logs (HELI), (2) helicopter removal of logs followed by a simulated skidder removal (SKID), and helicopter removal of logs follwed by glyphosphate application (GLYPH). Measurements of sediment accretion show little difference between treatments and reference in the first two years following harvest. After two years the harvest treatments accumulate more sediment than the REF. Of the harvest treatments, the GLYPH plots accumulate the greatest quantities of sediment. The difference in sediment accretion between the harvest treatments begins to fade in the 12th year of recovery. Results show that skidder and helicopter removal of logs differ very little in the amount of sediment trapped, while glyphosphate application increased the wetland's ability to trap sediment beginning in the second year. In addition, sediment trappin is associated with herbaceous cover that slows flood waters and allows soil particles to precipitate from flood water. / Master of Science temporal patterns harvest treatment accretion and erosion tupelo-baldcypress forested wetland sedimentation
12	A Multidisciplinary Approach for Determining the Extents of the Beds of Complex Natural Lakes in Louisiana Willis, Frank Levins 06 August 2009 (has links) In Louisiana, the beds of natural lakes are owned by the state. The locations of property boundary lines separating state property from private lands have usually been set by determining the levels of natural monuments known as ordinary high water marks. The term is confusing and subjective, leading to controversy in reference to its determination. Catahoula Lake in central Louisiana was chosen as a study site because of its large size, its 20-foot variation in water levels, and its low-relief perimeter. Geology, geomorphology, hydrology, archaeology, vegetation, dendrochronology and dendrohydrology of the ancient cypress fringe, nineteenth century land survey records, historical records, and time-series statistics were applied to determine the elevation range of ordinary high water. Research suggests that the level of the ordinary high water natural monument used universally in Louisiana to define lake boundaries is not the correct natural monument. This research suggests that, for example, the natural monument that defines the Catahoula Lake boundary is not a vertical monument, but rather an areal monument that was originally recognized by nineteenth century U.S. government surveyors and embedded in the evidence extracted from their original field notes. The solution coincides with the boundaries of regional land patents and offers a consistent solution to determining the boundaries of thousands of acres of disputed lands. The procedure is applicable to other lake and swamp boundaries in Louisiana and other states. Lake lake boundary lake shore bed shore bank survey river stream geomorphology geology tree rings cross dating dendrohydrology dendrochronology dendrosedimentology pollenology baldcypress ordinary high water ordinary high water mark Swamplands Act areal cypress fringe alluvial ridge natural monuments cypress knee Great Red River Raft Atchafalaya River raft US General Land Office land survey patent oil and gas litigation

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Sedimentation in a Tupelo-Baldcypress Wetland 12 Years Following Harvest Distubance

A Multidisciplinary Approach for Determining the Extents of the Beds of Complex Natural Lakes in Louisiana