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<br />..: <br /> <br />P.4 <br /> <br />. <br /> <br />GC25 I, and ~~:l con~~~ue ~o be ga~he~ed :~ ~~e ~es~i~g of che <br />hy?ot~=ses ~~ ~his GC~5 I: Rese3=ch ?l3r.. <br /> <br />D. ~~:ec~s of geac~ P~~tec~io~ gev:~~s <br /> <br />19. Questions: If the beaches in ~he canyon are deg~ading as <br />~any obse~Jers say they are, is it possible to mitigate this loss <br />witn devices designed to protec~ or stabilize sedi~ent <br />degradation? If so, what would the i~pacts be of building and <br />maintaining such struct~~es? What would be ~~e effects on the <br />recreational experience in the canyon? <br /> <br />Comments: In order to state hypotheses and establish a <br />research program to address the above questions on beach <br />protection devices, the type of protection devices as well as <br />sediment au~entation would have to be determined and the methods <br />of constructing and maintaining them developed. If the <br />techniques are natural in nature, such as establishing <br />vegetation, then the hypotheses testing the relationships between <br />vegetation and stability of the beaches (e.g., H.-2.2) will help <br />address this potential success of these techniques. One <br />hypothesis ~hat might be tested under this study is: <br /> <br />H.-19.1 There is no relationship be~Neen the potential <br />success of rehabilita~ing dete~iora~ed canping beaches and dam <br />opertions. <br /> <br />E. Effect9 of Sediment Aucrmentation <br /> <br />20. Questions: If sediment is being lost out of the Canyon <br />system (shown by testing H.-l.l and H.-3.1) and natural processes <br />for reestablishing beaches have been dete=mi~ed (see GeES I), is <br />it possible to help establish a sediment equilibrium in the <br />canyon and build beaches by augmenting sediment input and <br />creating appropriate discharges? If sediment is to be augmente~, <br />what methods would be ~ost successful and have the least <br />environmental i~pact? <br /> <br />Comments: Until it is determined, more accurately than <br />presently known, how much augmented sediment would be needed to <br />mitigate for sediment loss in the canyon (this might be answered <br />through testing ~~-3.1 along with more long-te~ studies of <br />sediment dyna~ics); and the teChnology is worked out for the <br />augmentation process, the above questions mus~ remain <br />speculative. <br /> <br />20 <br />