• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 667
  • 59
  • 46
  • 40
  • 38
  • 36
  • 26
  • 13
  • 8
  • 8
  • 8
  • 8
  • 8
  • 8
  • 5
  • Tagged with
  • 1163
  • 287
  • 187
  • 182
  • 181
  • 178
  • 177
  • 151
  • 133
  • 90
  • 90
  • 78
  • 78
  • 71
  • 67
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Wetland processes and opportunities for restoration in the Rodeo Lagoon Watershed ; Subsurface conditions at the Rodeo Beach parking lot at Fort Cronkhite : Golden Gate National Recreation Area, Marin County, California /

Shaw, S. David. January 1900 (has links) (PDF)
Contains reprint of author's professional report (Master of Landscape Architecture)--University of California, Berkeley, 2005. / Title from cover. "May 2006." Each report also has separate t.p. Includes bibliographical references. Also available in PDF via the Internet.
22

The effects of amendments and landscape position on the biotic community of constructed depressional wetlands

Alsfeld, Amy J. January 2007 (has links)
Thesis (M.S.)--University of Delaware, 2007. / Principal faculty advisor: Jacob L. Bowman, Dept. of Entomology & Wildlife Ecology. Includes bibliographical references.
23

A Study of Constructed Wetlands and Its Apply Strategies in Taiwan¡¦s Coastal Areas

Cho, Cheng-Te 15 February 2001 (has links)
ABSTRACT Coast zones are ecology sensitive areas, coastal wetlands may provide many biological, chemical and physical functions. However, as a result of economy develops, it makes many industrial estate and large-scale reclamation along the coast, the coastal wetlands are facing critical threatens, includes of habitat loss, industrial wastewater, wetlands degradation , fishery reduction and coastal zones erosion. In order to achieve the sustainable use of coastal resources and pure industrial wastewater and provide wildlife habitat, creating or restoring wetlands may resolve many problems in Taiwan¡¦s coastal zones. Coastal wetlands restoration, enhancement, and creation can clear up wastewater, increase wetlands and slow environmental destruction. Coastal wetlands also achieve recreational, educational , cultural functions, environmental education, and sustainable development of Taiwan¡¦s coastal zones. This thesis collect constructed wetlands history, and application cases, aim at the sensitive coastal in Taiwan to suggest constructed wetlands strategies. Keywords: Coastal Zone, Wetland, Constructed Wetland, Taiwan.
24

The study of household wastewater treated by artificial wetlands¡GA case study

WENG, SHIH-CHIEH 02 July 2009 (has links)
Artificial wetland treatment system is an economical water purification system which has high potential in water purification ecology method. Many countries utilized this natural treatment system to solve their waste problems (for example, wastewater and solid waste) and well results were found with proven efficient. Recently, Taiwan has started developing the natural treatment system utilizing the self-purifying function of the natural surrounding by using the physical, chemical and biological reactions in soil, plants and microorganisms, to reduce the concentrations of pollutants produced by wastes. Eventually, all the pollutants can be eliminated to the harmless level to the environment and its organisms. For better understanding the feasibility of artificial wetlands, we study the performance of artificial wetland system with its raw wastewater produced from its community household wastewater at Liao-Luo Village. Artificial wetland system is a natural purification system, no additional chemicals are needed. In addition, it can be easily operated and maintained, and can be used to treat wastewater with simple pollutants in school. Wetlands not only can be utilized to treat wastewater, but also for can be used for educational purposes. The investigation periods in this work is from May 2008 to Dec.2008. The average of removal efficiency were as follows: BOD (52%), E-colis (79%), NH3 (74%). Total N (61%) and Total P (72%). In comparison with related literatures, we operated with higher removal due to the facts containing the lower organic loading and longer water retention time to decompose pollutants in solution. To keep the Liao-Luo Village wetland¡¦s wastewater treatment function, periodical maintenance is performed. Besides moving grass and removing garbage, proper vegetables are planted in each treatment area are needed.
25

Timing of managed seasonal drawdowns to promote the establishment of wetland plant species on the Tule Lake National Wildlife Refuge, California /

Washburn, Carolyn Foley. January 2000 (has links)
Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 103-112).
26

Remote identification of wetlands in Mahoning and Trumbull County, Ohio

Krzys, Bethaney L. January 2008 (has links)
Thesis (M.A.)--Kent State University, 2008. / Title from PDF t.p. (viewed Dec. 22, 2009). Advisor: Mandy Munro-Stasiuk. Keywords: remote sensing, wetland, wetland identification, GIS. Includes bibliographical references (p. 158-161).
27

Visions of a wetland linking culture and conservation at Lake Manyas, Turkey /

Ari, Yilmaz. January 2001 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.
28

Created wetlands in Shing Mun River, Sha Tin /

Lin, Wai-tung. January 1999 (has links)
Thesis (M.L.A.)--University of Hong Kong, 1999. / Includes special study report entitled: Create freshwater wetlands. Includes bibliographical references.
29

Visions of a wetland : linking culture and conservation at Lake Manyas, Turkey /

Ari, Yilmaz. January 2001 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references (leaves 230-2̀49). Available also in a digital version from Dissertation Abstracts.
30

The effects of site preparation on native forb establishment in a wet prairie, Willamette Valley, Oregon /

Norman, Katherine N. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 40-46). Also available on the World Wide Web.

Page generated in 0.047 seconds