http://sic.g-eau.fr/ en SPIP - www.spip.net (Sarka-SPIP) https://sic.g-eau.fr/local/cache-vignettes/L32xH32/siteon0-e5814.png?1519033774 http://sic.g-eau.fr/ 32 32 https://sic.g-eau.fr/choice-of-branches https://sic.g-eau.fr/choice-of-branches 2009-10-22T15:33:50Z text/html en David Dorchies <p>The choice of reaches is principally linked to the hydraulic constraints. In order to let the user visualize portions of the canal that he wants to treat together, he may group a number of reaches into a branch. A branch is therefore a group of reaches serially linked to one another. <br class='autobr' /> Illustration of how a canal network is subdivided into reaches and branches. <br class='autobr' /> If the canal is not looped nor branched, the division into reaches and branches is thus simplified to the scheme shown in Figure (...)</p> - <a href="https://sic.g-eau.fr/-description-du-reseau-hydraulique-" rel="directory">Description of the hydraulic network</a> <div class='rss_texte'><p>The choice of reaches is principally linked to the hydraulic constraints. In order to let the user visualize portions of the canal that he wants to treat together, he may group a number of reaches into a branch. A branch is therefore a group of reaches serially linked to one another.</p> <p><span class='spip_document_39 spip_documents spip_documents_center'> <img src='https://sic.g-eau.fr/IMG/jpg/img000001330000000100000000.jpg?1425543362' width='500' height='212' alt="Description of hydraulic network" title="Description of hydraulic network" /></span></p> <p>Illustration of how a canal network is subdivided into reaches and branches.</p> <p>If the canal is not looped nor branched, the division into reaches and branches is thus simplified to the scheme shown in Figure 2 (in this example the system has been divided into two branches).</p> <p><span class='spip_document_40 spip_documents spip_documents_center'> <img src='https://sic.g-eau.fr/IMG/jpg/img000001370000000100000000.jpg?1425543362' width='500' height='133' alt="Choice of branches" title="Choice of branches" /></span></p></div> https://sic.g-eau.fr/description-of-the-hydraulic https://sic.g-eau.fr/description-of-the-hydraulic 2009-10-22T15:33:50Z text/html en David Dorchies <p>The hydraulic network is divided into homogeneous sections, the reaches being located between an upstream node and a downstream node. Relations between reaches occur only at the nodes.</p> - <a href="https://sic.g-eau.fr/-description-du-reseau-hydraulique-" rel="directory">Description of the hydraulic network</a> <div class='rss_texte'><p>The hydraulic network is divided into homogeneous sections, the reaches being located between an upstream node and a downstream node. Relations between reaches occur only at the nodes.</p> <p><span class='spip_document_39 spip_documents spip_documents_center'> <img src='https://sic.g-eau.fr/IMG/jpg/img000001330000000100000000.jpg?1425543362' width='500' height='212' alt="Description of hydraulic network" title="Description of hydraulic network" /></span></p></div> https://sic.g-eau.fr/choice-of-reaches https://sic.g-eau.fr/choice-of-reaches 2009-10-22T15:33:45Z text/html en David Dorchies <p>The choice of reaches by the model user is subject to some constraints which are detailed below: constraints due to network topology. constraints associated with points of inflows or outflows (they can occur only at model nodes). <br class='autobr' /> The user may however divide any part of the canal into several reaches in order to take into account some particularity, even if such a division is not imposed by the constraints described above. <br class='autobr' /> For instance, one can create a different reach for a lined canal (...)</p> - <a href="https://sic.g-eau.fr/-description-du-reseau-hydraulique-" rel="directory">Description of the hydraulic network</a> <div class='rss_texte'><p>The choice of reaches by the model user is subject to some constraints which are detailed below:</p> <ul class="spip"><li> constraints due to network topology.</li><li> constraints associated with points of inflows or outflows (they can occur only at model nodes).</li></ul> <p>The user may however divide any part of the canal into several reaches in order to take into account some particularity, even if such a division is not imposed by the constraints described above.</p> <p>For instance, one can create a different reach for a lined canal zone (low roughness), and an unlined canal zone (high roughness). One can also create reaches for administrative reasons, etc.</p> <p>The division into reaches for the user's convenience does not influence the results of the hydraulic calculation. Generally, when one divides a reach artificially, the lowermost cross-section of the upstream reach is the same as the uppermost cross-section of the reach immediately downstream.</p> <p>If different regulating/control devices exist across the canal, they can be integrated within a reach and do not need any special division. This approach facilitates the modeling of the hydraulic transition from free flow conditions to submerged conditions at such devices.</p></div>