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"Morris, Gregory L."
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Classification of Management Alternatives to Combat Reservoir Sedimentation
Sedimentation is steadily depleting reservoir capacity worldwide, threatening the reliability of water supplies, flood control, hydropower energy and other benefits that form the basis of today’s water-intensive society. The strategies available to combat reservoir sedimentation may be classed into four broad categories. Three proactive categories seek to improve the sediment balance across reservoirs by: (a) reducing sediment yield from the watershed, (b) routing sediment-laden flows around or through the storage pool, and (c) removing deposited sediment following deposition. The fourth category (d) consists of strategies that adapt to capacity loss, without addressing the sediment balance. Successful management will typically combine multiple strategies. This paper presents a comprehensive classification of both proactive and adaptive strategies, consistent with current international practice. Functional descriptions and examples are given for each strategy, and criteria are provided to differentiate between them when there is potential for ambiguity. The classification categories can be used as a checklist of strategies to consider in evaluating sediment management alternatives for new designs as well as remedial work at existing sediment-challenged reservoirs. This will also help practitioners to more clearly describe and communicate the nature of their management activities. Widespread application of both active and adaptive strategies is required to bring sedimentation under control to sustain benefits of water storage for today’s and future generations.
Journal Article
Sustainable sediment management in reservoirs and regulated rivers: Experiences from five continents
By trapping sediment in reservoirs, dams interrupt the continuity of sediment transport through rivers, resulting in loss of reservoir storage and reduced usable life, and depriving downstream reaches of sediments essential for channel form and aquatic habitats. With the acceleration of new dam construction globally, these impacts are increasingly widespread. There are proven techniques to pass sediment through or around reservoirs, to preserve reservoir capacity and to minimize downstream impacts, but they are not applied in many situations where they would be effective. This paper summarizes collective experience from five continents in managing reservoir sediments and mitigating downstream sediment starvation. Where geometry is favorable it is often possible to bypass sediment around the reservoir, which avoids reservoir sedimentation and supplies sediment to downstream reaches with rates and timing similar to pre‐dam conditions. Sluicing (or drawdown routing) permits sediment to be transported through the reservoir rapidly to avoid sedimentation during high flows; it requires relatively large capacity outlets. Drawdown flushing involves scouring and re‐suspending sediment deposited in the reservoir and transporting it downstream through low‐level gates in the dam; it works best in narrow reservoirs with steep longitudinal gradients and with flow velocities maintained above the threshold to transport sediment. Turbidity currents can often be vented through the dam, with the advantage that the reservoir need not be drawn down to pass sediment. In planning dams, we recommend that these sediment management approaches be utilized where possible to sustain reservoir capacity and minimize environmental impacts of dams.
Key Points
Reservoirs trap sediment, losing storage capacity
Downstream reaches can become sediment starved
Many dams can be designed/operated to pass sediment
Journal Article
Investing with the Trend
Investing with the Trend provides an abundance of evidence for adapting a rules-based approach to investing by offering something most avoid, and that is to answer the \"why\" one would do it this way. It explains the need to try to participate in the good markets and avoid the bad markets, with cash being considered an asset class. The book is in three primary sections and tries to leave no stone unturned in offering almost 40 years of experience in the markets. Part I - The focus is on much of the misinformation in modern finance, the inappropriate use of Gaussian statistics, the faulty assumptions with Modern Portfolio Theory, and a host of other examples. The author attempts to explain each and offer justification for his often strong opinions. Part II - After a lead chapter on the merits of technical analysis, the author offers detailed research into trend analysis, showing how to identify if a market is trending or not and how to measure it. Further research involves the concept of Drawdown, which the author adamantly states is a better measure of investor risk than the oft used and terribly wrong use of volatility as determined by standard deviation. Part III - This is where he puts it all together and shows the reader all of the steps and details on how to create a rules-based trend following investment strategy. A solid disciplined strategy consists of three parts, a measure of what the market is actually doing, a set of rules and guidelines to tell you how to invest based upon that measurement, and the discipline to follow the strategy.
eBook
\Boy with Loaded Gun\: The Confessions of Lewis Nordan
Morris comments on Lewis Nordan's confessions about his writing. Nordan writes a fool's confession, an apology for a life still being lived in the long, ineluctable shadows of geography and blood.
Journal Article