Modeling Spatial Patterns of Dissolved Oxygen and the Impact Mechanisms in a Cascade River

Dissolved oxygen (DO) concentration is an essential indicator for assessment of river ecosystems. A hydrodynamic and water quality mathematical model coupling one-dimensional and two-dimensional models is developed in this study. The characteristics of study area, flow velocity, temperature, and organic contamination are taken as consideration in the scenario setting. The changing processes of DO concentration are simulated in different scenarios, and the effects on DO concentration are discussed. Results indicate that: 1) A negative relation was present between DO concentration in Yongjiang River and releasing discharge of the Laokou hydro-project, since reoxygenation is greater than oxygen consumption along the river, DO concentration increases from upstream to downstream. 2) DO concentration increases with the releasing of DO in the water, which also varies along with the releasing of biochemical oxygen demand (BOD) concentration. Laokou exhibits the greatest increase of BOD, which ranges from 0.1 mg/L to 0.75 mg/L 3) The increasing of water temperature results in increased reoxygenation and a decrease in oxygen consumption. Our study shows that the water temperature increased from 19°C to 29 °C, and correspondingly saturated DO decreased from 9.25 mg/L to 7.54 mg/L. The study provides scientific support for ecology operation in the cascade river, and is expected to improve the water environment by reservoir regulation.

50 Years of Construction Camps and Single Purpose Towns in the South

<p>This thesis aims to ascertain lessons which can be learnt from the provision of accommodation at a progression of hydro projects in the south of New Zealand. Seven case studies have been distilled from a wide range (and number) of existing documents and literature and collated in a manner unavailable in current literature in order to allow the researcher to compare and contrast them with a historical-interpretive methodology. The analyses culminate in conclusions regarding site conditions, accommodation and layout designs and sense of community and the effect that these have had on past hydro project accommodations. This is done in order to provide a platform for further research into the development of guidelines for future large construction camps and single purpose towns within New Zealand, now that the designer and provider of the camps and towns which form the case studies in this thesis (the MoWD) has been abolished.</p>

50 Years of Construction Camps and Single Purpose Towns in the South

<p>This thesis aims to ascertain lessons which can be learnt from the provision of accommodation at a progression of hydro projects in the south of New Zealand. Seven case studies have been distilled from a wide range (and number) of existing documents and literature and collated in a manner unavailable in current literature in order to allow the researcher to compare and contrast them with a historical-interpretive methodology. The analyses culminate in conclusions regarding site conditions, accommodation and layout designs and sense of community and the effect that these have had on past hydro project accommodations. This is done in order to provide a platform for further research into the development of guidelines for future large construction camps and single purpose towns within New Zealand, now that the designer and provider of the camps and towns which form the case studies in this thesis (the MoWD) has been abolished.</p>