Thesis (M.S. in civil engineering)--Washington State University, December 2007. / Includes bibliographical references (p. 45-48).

Thesis (M.S.)--University of Nevada, Reno, 2007. / Includes bibliographical references (p. 301-309). Also available via the Internet.

Water management that alters riverine ecosystem processes has strongly influenced deltas and the people who depend on them, but a full accounting of the trade-offs is still emerging. Using palaeoecological data, we document a surprising biogeochemical consequence of water management in the Colorado River basin. Complete allocation and consumptive use of the river's flow has altered the downstream estuarine ecosystem, including the abundance and composition of the mollusc community, an important component in estuarine carbon cycling. In particular, population declines in the endemic Colorado delta clam, Mulinia coloradoensis, from 50-125 individuals m(-2) in the pre-dam era to three individualsm-2 today, have likely resulted in a reduction, on the order of 5900-15 000 tCyr(-1) (4.1-10.6 mol Cm-2 yr(-1)), in the net carbon emissions associated with molluscs. Although this reduction is large within the estuarine system, it is small in comparison with annual global carbon emissions. Nonetheless, this finding highlights the need for further research into the effects of dams, diversions and reservoirs on the biogeochemistry of deltas and estuaries worldwide, underscoring a present need for integrated water and carbon planning.

Thesis (M.Eng.)--Memorial University of Newfoundland. / Typescript. Bibliography: l. 80-84. Also available online.

Inter-Basin-Water Transfers significantly reduce flow and sediment regimes to the downstream ecosystem effecting differential channel adjustment at various locations. It is not known how macroinvertebrates adjust to flow regulation, either spatially or temporally, because research is lacking into how morphological adjustment affects benthic habitat. Feedback mechanisms that initiate the adjustment process must first be identified, then the effect on benthic habitat becomes apparent, thus, providing a link to macroinvertebrate response. Since regulation there has been a 95% reduction in flow volume, a complete downward shift in both the flow duration and flood frequency curves and a 194% increase in flow constancy compared to the pre- dam period. Furthermore, Jindabyne Dam traps 99.9% of the total incoming sediment load. Upstream of the tributary the dominant river response was accommodation adjustment with subsequent contraction of the river channel. Associated feedback mechanisms were ?armouring? and vegetation encroachment. Downstream of the tributary response was more complex, with channel contraction through aggradation and specifically the formation of a tributary mouth bar and fan, mid channel lobate bar, transverse bar and in-channel bench. Associated feedback mechanisms were interactions between vegetation and sediment; channel morphology, flow and sediment distribution; and sediment distribution, flow and channel morphology. These processes have had site specific and reach scale impacts on benthic habitat. Macroinvertebrate response to flow regulation was habitat specific (riffle or edge) and seemed to correspond to either site, or reach scale morphological adjustment, whereas, flow constancy seemed to affect edge macroinvertebrates throughout both reaches. Spatially, macroinvertebrates have not adjusted to the post- dam flow regime and temporally, macroinvertebrates have not recovered 30 years after the closure of Jindabyne Dam. How physical processes change habitats and how these impact on a river?s ecology and at what scale, are important considerations in river management.

Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 206-221).

No description available.

南水北調中綫工程的完成是國家權力成功運作的結果，而本文希望透過檢視水源地之一十堰市在環境治理上的表現來刻畫地方政府的行爲模式。 經濟發展與環境保護歷來是地方政府需要面臨的雙重考驗，縱向上看，中央與地方也常因利益分歧造成政策執行上的扭曲。而這種中央-地方關係及經濟發展與環境保護的矛盾在水源地十堰市體現得尤為明顯。因爲作爲水源地它需要切實貫徹中央「保水質」的任務，但是「保水質」與「保護環境」有著不同的內涵和指向，其背後是中央與地方利益的較量。然而，更深層次的矛盾在於，作爲一個貧困地區，十堰市本身脫貧壓力巨大，發展經濟的意願强烈。爲了保護水源地，十堰市必須在經濟發展上做出犧牲。面對這一複雜情境，十堰市的領導人毅然選擇完成中央交辦的任務。 本文希望透過檢視十堰市政府與上級政府及地方行動者的互動來勾畫出地方政府的行爲模式，同時探討其行爲背後的原因。 / The south-to-north water transfer project is a great hydraulic engineering aiming at relieving water scarcity problem in Northern China. The Chinese central government plays an important role in building dams and transferring water through closed conduit. However, the more challenging problem is to guarantee the water quality of the water source area:Danjiankou Reservoir. As the main part of the reservoir is located in Shiyan city, it has no choice but to take responsibility of protecting environment and make sure that the water quality standard can be reached. Facing such arduous task, Shiyan spare no effort in reaching the goal, and some polluting industries are badly effected or even prohibited. As the result, the performance of Shiyan is appreciated by leaders of all levels, but these measures are controversial. Balancing between economic development and environmental protection is quite difficult, but as an extremely poor city, Shiyan City would rather protect aquatic environment for northern people than develop economy for local residents. So the performance of Shiyan city aroused my interest.This thesis tries to throw light on how Shiyan governed the environment and how it react to pressures from above and below, and why it happened. The conclusion is that Shiyan takes different strategies towards different actors, and the reason is related to performance evaluation system and promotion. And the results are based on field work, books ,journals and so on.

New Zealand Agricultural Engineering Institute / Also published as: Agricultural Engineering Thesis no. 4 / For large areas of New Zealand that suffer from agricultural drought, the only practicable way of providing irrigation is through the use of water harvesting schemes that divert winter flood water in nearby streams into off-stream storages for irrigation use in the summer. A community water harvesting scheme is presently under construction in the Glenmark area of North Canterbury which was designed using traditional methods. The objectives of this thesis were to assess the limitations of traditional design methods for water harvesting schemes using the Glenmark Scheme as a case study and to develop an improved method based on a systems modelling approach. A daily simulation model was developed that incorporated in a realistic way the engineering, hydrologic, agronomic and economic features of importance to the design of water harvesting schemes in New Zealand. The model was used to study the adequacy of the traditional methods used for the design of the Glenmark Scheme; to arrive at alternative design solutions that achieved higher levels of engineering, agronomic and economic efficiency; and to develop a better understanding of the nature of complex water harvesting systems. It was demonstrated that compounding conservatism inherent in traditional design methods resulted in scheme overdesign and that the ability of the systems model to capture the essential dynamics of the system allowed higher levels of design performance to be achieved. The experience gained in the use of the systems model led to the development of a formalised design procedure for water harvesting schemes that represents an advance on methods hitherto available.