Author: Christopher F. JonesPublisher:
ISBN:
Category : Floodplain ecology
Languages : en
Pages : 210
Book Description
A Case Study of a Floodplain Channel Restoration Project in the Southern WIllamette Valley of Oregon
Author: Christopher F. JonesPublisher:
ISBN:
Category : Floodplain ecology
Languages : en
Pages : 210
Book Description
Willamette River Floodplain Restoration, Oregon
Author: United States. Office of the Assistant Secretary of the Army (Civil Works)Publisher:
ISBN:
Category : Environmental impact analysis
Languages : en
Pages : 1308
Book Description
Economic Analysis of Restoration Practices to Improve Water Quality and Fish Habitat of a Large River Floodplain
Author: Saichon SeedangPublisher:
ISBN:
Category : Ecosystem management
Languages : en
Pages : 298
Book Description
In- stream water temperature is one of the most important environmental factors associated with the decline in salmonid populations and their habitats in the Pacific Northwest. Most ecological restoration practices that attempt to reduce instream temperatures center on replanting or reestablishing riparian vegetation and increasing flows. However, in a large floodplain river like the Willamette, restoring hyporheic flow may also play an important role in reducing water temperature. The objective of this dissertation is to examine restoration practices that focus on the reduction of water temperatures in the upper mainstem Willamette River, Oregon, for the benefit of salmonid species. Economic information is developed to determine the cost-effectiveness of water temperature reduction strategies. The CEQUAL- W2 water temperature model is used to simulate the effects of upstream combinations of riparian shading and flow increments on downstream water temperatures. Costs associated with these strategies are estimated. These costs consist of the opportunity costs of losing agricultural production, and losing recreation due to flow releases from up-stream reservoirs. The effectiveness of each strategy in reducing water temperature and the associated costs are used to construct a cost-effectiveness frontier. The results indicate that the cumulative effects of shading and flows have little impact on temperature reduction downstream. Even when maximum available resources are allocated to investments in shade and flow increases they cannot lower summer water temperatures sufficiently to meet the state water temperature standard. However, the restoration practices selected from the cost-effectiveness frontiers method do provide ranges of achievable temperature reductions at minimum costs. These results are thus useful management tools when selecting policies to pursue water temperature goals. Hyporheic temperature reduction is also examined. Restoration practices associated with this type of cooling are done through removal/reconnection of the obstacles that are necessary to allow the process of re-creating dynamic channel complexity. The observed significant reduction of summer water temperatures associated with channel complexity indicates that this approach is more flexible in reducing temperature than approaches that rely on flow increments or/and shade. Although the costs associated with the hyporheic approach are substantial, the effects of such a long-term ecological improvement of floodplain habitat may substantially benefit salmonid populations.
Willamette River Floodplain Restoration Study
Author: United States. Army. Corps of Engineers. Portland DistrictPublisher:
ISBN:
Category : Floodplain management
Languages : en
Pages : 38
Book Description
Willamette River Floodplain Restoration, Oregon
Author: United States. Office of the Assistant Secretary of the Army (Civil Works)Publisher:
ISBN:
Category : Environmental impact analysis
Languages : en
Pages : 1273
Book Description
Willamette River, Oregon, Floodplain Restoration Project
Author: Willamette River Basin, Oregon, Floodplain Restoration Project
Author: Flood Plain Information
Author: United States. Army. Corps of Engineers. Portland DistrictPublisher:
ISBN:
Category : Flood control
Languages : en
Pages : 94
Book Description
Review Plan
Author: United States. Army. Corps of Engineers. Portland DistrictPublisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
Book Description
Willamette River Basin, Oregon: Bank Protection and Channel Improvement
Author: United States. Army. Corps of EngineersPublisher:
ISBN:
Category : Flood control
Languages : en
Pages : 172
Book Description