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首页> 外文会议>CDS Report no.377; Western Dredging Association 24th Technical Conference and 36th Texas Aamp;M Dredging Seminar; 20040706-09; Orlando,FL(US) >POPLAR ISLAND ENVIRONMENTAL RESTORATION PROJECT DREDGED MATERIAL VOLUME TRACKING FOR TIDAL WETLAND CONSTRUCTION
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POPLAR ISLAND ENVIRONMENTAL RESTORATION PROJECT DREDGED MATERIAL VOLUME TRACKING FOR TIDAL WETLAND CONSTRUCTION

机译：杨树岛环境恢复项目潮汐湿地建设的先进材料量追踪

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摘要

Poplar Island is a unique 1, 140-acre (461-hectare) environmental restoration project located in Chesapeake Bay approximately 35 miles (56 km) southeast of Baltimore. The project is a Beneficial-Use site, using dredged material to create both upland and tidal wetland. A 25 acre (10 hectare) "Development" cell (Cell 3D) was designed to be an archetype and provide lessons learned for the construction of future wetland cells. In tidal wetlands, the species of vegetation able to survive are largely dependent on the wetland elevation being within a narrow window (about 0.5 to 1 ft (15 - 30 cm)). Attaining the narrow elevation window is particularly difficult with dredged material. This is because of the dynamic volumetric behavior of these typically fine-grained soils during dredging, transportation, placement, decant, and desiccation and consolidation process. The Cell 3D project provides a site-specific, empirical model of the bulking and shrinking behavior of dredged material. The model tracks fluctuations of the cut (reference) volume in real-time from dredging in the channel (cut), to transportation in the barge, to hydraulic placement in the cell, through desiccation and consolidation, and to the final stable "steady state" condition, which is reached when no further measurable desiccation or consolidation will occur. This paper focuses on effective methods for real-time tracking of dredged material volumes. The standard method for tracking dredged volume is hydrographic surveying of the channel before and after dredging. Logistics dictate that after-dredge surveys may not be timely for material management decisions. Two additional measurement locations beyond the channel are being practiced. These involve volume and weight measurements in the barge and elevation and moisture content measurements in the cell. The most timely measurements for material management are at the barge, where a mass balance method is currently used for measuring dredged volumes. This paper provides the history of the Poplar Site, construction methods for tidal wetlands using dredged material, an analysis of the various methods for monitoring dredged material volumes, and a case study of tidal wetland Cell 3D. Recommendations are presented for economically tracking dredged material from the cut to cell placement in real-time for the facilitation of tidal wetland construction.
机译：白杨岛是一个独特的1,140英亩（461公顷）的环境修复项目，位于巴尔的摩东南约35英里（56公里）的切萨皮克湾。该项目是一个有益用途的场地，使用疏material的材料制造高地和潮汐湿地。一个25英亩（10公顷）的“发育”单元（Cell 3D）被设计为原型，并为建设未来的湿地单元提供了经验教训。在潮汐湿地中，能够生存的植被种类在很大程度上取决于湿地在狭窄的窗口（约0.5至1英尺（15至30厘米））内的高度。对于疏material的材料，要达到狭窄的仰角窗口特别困难。这是因为在疏fine，运输，放置，倾析以及干燥和固结过程中，这些典型的细颗粒土壤的动态体积行为。 Cell 3D项目提供了特定位置的经验模型，用于挖掘的材料的膨胀和收缩行为。该模型实时跟踪切割（参考）体积的变化，从通道（挖）中的挖泥，到驳船中的运输，通过脱水和固结到单元中的液压位置，以及最终稳定的“稳定状态” ”条件，将不会发生进一步的可测量的干燥或合并。本文重点介绍了实时跟踪疏material物料量的有效方法。跟踪挖泥量的标准方法是在挖泥之前和之后对河道进行水文测量。后勤规定，对物料管理决定可能不及时进行挖泥后调查。正在实践通道之外的两个其他测量位置。这些涉及到驳船中的体积和重量测量以及单元中的高程和水分含量测量。对于驳船管理，最及时的测量是在驳船上，在该船上，目前使用质量平衡方法来测量疏ged量。本文提供了杨树遗址的历史，使用疏material材料建造潮汐湿地的方法，分析各种监测疏monitoring材料量的方法以及潮汐湿地Cell 3D案例研究。提出了一些建议，以经济的方式实时跟踪挖出的材料从切口到单元的位置，以促进潮汐湿地的建设。

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