﻿{"id":574,"date":"2015-02-27T10:21:24","date_gmt":"2015-02-27T09:21:24","guid":{"rendered":"http:\/\/www.sigterritoires.fr\/?p=574"},"modified":"2017-03-30T09:42:09","modified_gmt":"2017-03-30T08:42:09","slug":"lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2","status":"publish","type":"post","link":"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/","title":{"rendered":"L\u2019hydrologie avec un SIG, pour les nuls (que nous sommes): calcul de l\u2019\u00e9coulement (2)"},"content":{"rendered":"<p>Cet article fait suite directe de l&rsquo;article <a href=\"http:\/\/www.sigterritoires.fr\/?p=538\">L\u2019hydrologie avec un SIG, pour les nuls (que nous sommes): calcul de l\u2019\u00e9coulement(1)<\/a><\/p>\n<p>Nous allons voir maintenant le r\u00e9sultat de l&rsquo;application d&rsquo;une autre m\u00e9thode de calcul d&rsquo;\u00e9coulement.<\/p>\n<h2>Deuxi\u00e8me m\u00e9thode : Rho8<\/h2>\n<p>Elle est une modification de la m\u00e9thode pr\u00e9c\u00e9dente. C\u2019est toujours un flux unidimensionnel: toute l\u2019eau de la cellule passe vers une et une seule autre cellule. Si dans la m\u00e9thode D8, le flux est calcul\u00e9 selon la pente la plus importante entre la cellule consid\u00e9r\u00e9e et ses 8 cellules contigu\u00ebs, dans la m\u00e9thode Rho8 on va introduire un facteur al\u00e9atoire, calcul\u00e9 \u00e0 partir de l&rsquo;orientation de la cellule centrale et de la direction des deux cellules contigu\u00ebs qui se situent dans cette direction.<\/p>\n<p>Dans QGis vous utiliserez, dans la fen\u00eatre de traitements-> SAGA -> Terrain analysis-Hydrology -> Catchment area (parallel)<br \/>\n<a href=\"http:\/\/www.sigterritoires.fr\/?attachment_id=575\" rel=\"attachment wp-att-575\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"575\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/flow6\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow6.png?fit=684%2C552&amp;ssl=1\" data-orig-size=\"684,552\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"flow6\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow6.png?fit=630%2C508&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow6-630x508.png?resize=630%2C508\" alt=\"m\u00e9thode Rho8 pour le calcul de l&#039;\u00e9coulement\" title=\"flow6\" width=\"630\" height=\"508\" class=\"aligncenter size-large wp-image-575\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow6.png?resize=630%2C508&amp;ssl=1 630w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow6.png?resize=300%2C242&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow6.png?w=684&amp;ssl=1 684w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/a><br \/>\nLe r\u00e9sultat de cette m\u00e9thode sur le MNT en forme semi-sph\u00e9rique, pour la couche \u00ab catchment area \u00bb est le suivant:<br \/>\n<a href=\"http:\/\/www.sigterritoires.fr\/?attachment_id=576\" rel=\"attachment wp-att-576\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"576\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/flow7\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7.png?fit=639%2C642&amp;ssl=1\" data-orig-size=\"639,642\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"flow7\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7.png?fit=627%2C630&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7-627x630.png?resize=627%2C630\" alt=\"r\u00e9sultat de l&#039;\u00e9coulement Rho8\" title=\"flow7\" width=\"627\" height=\"630\" class=\"aligncenter size-large wp-image-576\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7.png?resize=627%2C630&amp;ssl=1 627w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7.png?resize=298%2C300&amp;ssl=1 298w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow7.png?w=639&amp;ssl=1 639w\" sizes=\"auto, (max-width: 627px) 100vw, 627px\" \/><\/a><\/p>\n<p>Si vous comparez maintenant avec le r\u00e9sultat de la m\u00e9thode D8:<br \/>\n<a href=\"http:\/\/www.sigterritoires.fr\/?attachment_id=578\" rel=\"attachment wp-att-578\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"578\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/flow4-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow41.png?fit=642%2C651&amp;ssl=1\" data-orig-size=\"642,651\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"flow4\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow41.png?fit=621%2C630&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow41-621x630.png?resize=621%2C630\" alt=\"r\u00e9sultat de la m\u00e9thode de calcul de l&#039;\u00e9coulement D8\" title=\"flow4\" width=\"621\" height=\"630\" class=\"aligncenter size-large wp-image-578\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow41.png?resize=621%2C630&amp;ssl=1 621w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow41.png?resize=295%2C300&amp;ssl=1 295w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow41.png?w=642&amp;ssl=1 642w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><\/a><\/p>\n<p>Vous pouvez observer que la concentration sur les 8 directions principales (0,45,90,135,&#8230;) est nettement moins marqu\u00e9e. Par contre, \u00e9tant donn\u00e9 que nous sommes sur un sph\u00e8re parfaite, l&rsquo;eau devrait s&rsquo;\u00e9couler de mani\u00e8re homog\u00e8ne et non sous forme de \u00ab\u00a0fils\u00a0\u00bb.<\/p>\n<p>Pour mieux comprendre ce commentaire, nous allons passer \u00e0 une autre m\u00e9thode de calcul.<\/p>\n<h2>Troisi\u00e8me m\u00e9thode : Multiple Flow Direction (MFD) aussi d\u00e9nomm\u00e9e FD8<\/h2>\n<p>Contrairement aux deux m\u00e9thodes pr\u00e9c\u00e9dentes, l&rsquo;\u00e9coulement \u00e0 partir d&rsquo;une cellule ne se fait pas en direction d&rsquo;une et une seule cellule. Selon la pente du terrain, toutes les cellules situ\u00e9s plus bas que la cellule concern\u00e9e recevront une partie de l&rsquo;\u00e9coulement.<\/p>\n<p>La figure suivante est tir\u00e9e de la publication \u00e0 l&rsquo;origine de cette m\u00e9thode.<br \/>\n<a href=\"http:\/\/www.sigterritoires.fr\/?attachment_id=580\" rel=\"attachment wp-att-580\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"580\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/flow10\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow10.png?fit=690%2C474&amp;ssl=1\" data-orig-size=\"690,474\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"flow10\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow10.png?fit=630%2C432&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow10-630x432.png?resize=630%2C432\" alt=\"\u00e9coulement multiple\" title=\"flow10\" width=\"630\" height=\"432\" class=\"aligncenter size-large wp-image-580\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow10.png?resize=630%2C432&amp;ssl=1 630w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow10.png?resize=300%2C206&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow10.png?w=690&amp;ssl=1 690w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/a><\/p>\n<p>Vous pouvez consulter cette publication directement :Quinn, P.F.; Beven, K.J.; Chevallier, P.; Planchon, O.; The prediction of hillslope flow paths for distributed hydrological modelling using digital terrain models, Hydrological Processes, 5: 59\u201379. 1991<\/p>\n<p>Pour mettre en oeuvre cette m\u00e9thode, avec QGis, vous utiliserez, la fen\u00eatre de traitements-> SAGA -> Terrain analysis-Hydrology -> Catchment area (parallel)<\/p>\n<p><a href=\"http:\/\/www.sigterritoires.fr\/?attachment_id=581\" rel=\"attachment wp-att-581\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"581\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/flow8\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow8.png?fit=678%2C492&amp;ssl=1\" data-orig-size=\"678,492\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"flow8\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow8.png?fit=630%2C457&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow8-630x457.png?resize=630%2C457\" alt=\"fen\u00eatre de traitement sage : MFD\" title=\"flow8\" width=\"630\" height=\"457\" class=\"aligncenter size-large wp-image-581\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow8.png?resize=630%2C457&amp;ssl=1 630w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow8.png?resize=300%2C217&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow8.png?w=678&amp;ssl=1 678w\" sizes=\"auto, (max-width: 630px) 100vw, 630px\" \/><\/a><\/p>\n<p>Le r\u00e9sultat de cette m\u00e9thode sur le MNT en forme semi-sph\u00e9rique, pour la couche \u00ab catchment area \u00bb est le suivant:<br \/>\n<a href=\"http:\/\/www.sigterritoires.fr\/?attachment_id=582\" rel=\"attachment wp-att-582\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"582\" data-permalink=\"https:\/\/www.sigterritoires.fr\/index.php\/lhydrologie-avec-un-sig-pour-les-nuls-que-nous-sommes-calcul-de-lecoulement-2\/flow9\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow9.png?fit=621%2C624&amp;ssl=1\" data-orig-size=\"621,624\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"flow9\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow9.png?fit=621%2C624&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow9.png?resize=621%2C624\" alt=\"r\u00e9sultat de l&#039;\u00e9coulement calcul\u00e9 avec la m\u00e9thode MFD (FD8)\" title=\"flow9\" width=\"621\" height=\"624\" class=\"aligncenter size-full wp-image-582\" srcset=\"https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow9.png?w=621&amp;ssl=1 621w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow9.png?resize=150%2C150&amp;ssl=1 150w, https:\/\/i0.wp.com\/www.sigterritoires.fr\/wp-content\/uploads\/2015\/02\/flow9.png?resize=298%2C300&amp;ssl=1 298w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><\/a><\/p>\n<p>Ici nous avons un \u00e9coulement globalement uniforme, sur une semi-sph\u00e8re uniforme. Si on zoome, on s\u2019aper\u00e7oit que la structure en 8 imprime un certain tramage. En effet, m\u00eame si les flux sont multiples, il sont calcul\u00e9s de centre de la cellule centrale aux centres des cellules contigu\u00ebs. La trame 0,45,90,&#8230; appara\u00eet ici, mais quand on regarde au niveau du d\u00e9tail et disparait quand on regarde le ph\u00e9nom\u00e8ne de plus haut.<\/p>\n<p>Dans le prochain article on abordera les autres m\u00e9thodes de calculs restantes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cet article fait suite directe de l&rsquo;article L\u2019hydrologie avec un SIG, pour les nuls (que nous sommes): calcul de l\u2019\u00e9coulement(1) Nous allons voir maintenant le r\u00e9sultat de l&rsquo;application d&rsquo;une autre m\u00e9thode de calcul d&rsquo;\u00e9coulement. Deuxi\u00e8me m\u00e9thode&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"sfsi_plus_gutenberg_text_before_share":"","sfsi_plus_gutenberg_show_text_before_share":"","sfsi_plus_gutenberg_icon_type":"","sfsi_plus_gutenberg_icon_alignemt":"","sfsi_plus_gutenburg_max_per_row":"","_monsterinsights_skip_tracking":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[9,26,62],"tags":[15,71,91,92,95,94,25,58,93,18],"class_list":["post-574","post","type-post","status-publish","format-standard","hentry","category-arcgis-pro","category-outils-et-methodes","category-qgis-2","tag-arcgis","tag-archydro","tag-bassin-versant","tag-d8","tag-fd8","tag-mfd","tag-mnt","tag-qgis","tag-rho8","tag-surface"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"L\u2019hydrologie avec un SIG, pour les nuls (que nous sommes): calcul de l\u2019\u00e9coulement (2). 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