{"id":41871,"date":"2026-11-11T13:35:00","date_gmt":"2026-11-11T13:35:00","guid":{"rendered":"https:\/\/www.avizo.ca\/?p=41871"},"modified":"2026-11-11T13:45:46","modified_gmt":"2026-11-11T13:45:46","slug":"channel-incision-riverbank-erosion","status":"publish","type":"post","link":"https:\/\/www.avizo.ca\/en\/2026\/11\/11\/channel-incision-riverbank-erosion\/","title":{"rendered":"Channel Incision: The Overlooked Cause of Riverbank Erosion"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Channel incision, the downcutting of a riverbed, is a widespread but poorly understood cause of riverbank erosion in Quebec\u2019s populated areas. Telling it apart from lateral river migration is essential, because conventional bank stabilization techniques perform poorly in incising channels and can even make the problem worse.<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Two types of riverbank erosion that are easily confused<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Riverbank erosion is one of the most common reasons clients seek advice in <a href=\"https:\/\/www.avizo.ca\/en\/services\/natural-environments-and-watercourses\/hydrogeomorphology\/\">fluvial geomorphology<\/a>. It can have several causes, each corresponding to a different type of erosion. The best known is lateral migration, or lateral mobility, of the river. This process is now built into Quebec\u2019s Environment Quality Act (EQA) and into flood and mobility zone mapping, and it ties in with the concept of a <a href=\"https:\/\/www.avizo.ca\/en\/2026\/07\/23\/the-freedom-space-of-a-watercourse\/\">watercourse\u2019s freedom space<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Another type, erosion caused by channel incision, is less well understood. Yet it is very common and often more problematic, especially in rivers flowing through built-up areas. Because it is very difficult to recognize without a site visit, identifying it requires specialized expertise.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is channel incision?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Channel incision occurs when a river\u2019s bed is eroded\/degraded. The banks then become too steep and collapse, causing bank erosion. The process stems from an imbalance between the quantity of sediment entering a river reach and the quantity of sediment leaving it. Two causes, often combined, are involved:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>A reduction of sediment supply<\/strong>: the river no longer receives enough sediment, either from upstream of from its banks, a condition sometimes known as a \u201csediment-starved\u201d or \u201chungry\u201d river.<\/li>\n\n\n\n<li><strong>Increased flows<\/strong>: during flood peaks, the water carries away a larger share of the bed sediment.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Rivers function as a continuum, so upstream interventions strongly influence downstream conditions. For example, armouring a bank with riprap limits the amount of sediment passed downstream. During floods, bed sediment is mobilized but no longer replaced by the bank material that would otherwise have eroded. The riprap has succeeded in stabilizing the bank, but it has shifted the problem downstream. This is why analyzing <a href=\"https:\/\/www.avizo.ca\/en\/services\/natural-environments-and-watercourses\/fluvial-transport-dynamics\/\">fluvial transport dynamics<\/a> is central to the diagnosis.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/incising-stream-eroded-banks.webp\" alt=\"Incising stream with steep, collapsed banks exposing tree roots\"\/><figcaption class=\"wp-element-caption\">An incising channel: the bed is lowering and the banks are collapsing.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/downstream-sediment-deposit-channel-incision.webp\" alt=\"Aerial view of a large sediment deposit at the mouth of a stream, between two docks\"\/><figcaption class=\"wp-element-caption\">Sediment eroded from the incising channel builds up into a large deposit downstream.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why conventional bank stabilization fails<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In an incising channel, conventional bank stabilization techniques perform poorly or not at all. Worse, they can aggravate the problem: structures tend to fail and must be rebuilt indefinitely. The problem has to be addressed at its source, with properly adapted <a href=\"https:\/\/www.avizo.ca\/en\/services\/natural-environments-and-watercourses\/design-of-riparian-and-water-developments\/\">riparian and in-stream works<\/a>, to avoid recurring costs for watercourse managers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Channel incision also has ecological consequences. It disconnects the river from its floodplain, directly affecting the natural habitats found there, reducing biodiversity and making the river less resilient to major floods.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One documented case shows the scale of the process: photos of the same house taken in 1944 and 2024 reveal up to 3 m (10 ft) of incision over 80 years. Works carried out in the river in response to bank erosion accelerated the incision. Structures had to be extended to other sections of the river and rebuilt several times, at significant cost to the community.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/11\/river-incision-house-1944-2024.webp\" alt=\"The same riverside house in 1944 and 2024: a gently sloping bank replaced by a tall retaining wall\"\/><figcaption class=\"wp-element-caption\">The same house in 1944 and 2024: up to 3 m (10 ft) of incision over 80 years. Sources: BAnQ num\u00e9rique and Google.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">A fluvial geomorphology diagnosis for lasting solutions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Avizo\u2019s expertise in fluvial geomorphology allows us to accurately diagnose watercourses and the root causes of their problems before any intervention. This <a href=\"https:\/\/www.avizo.ca\/en\/2026\/03\/11\/avizo-integrated-approach-watercourse-quebec\/\">integrated approach to watercourses<\/a> avoids repeated interventions and the high costs that come with them. Avizo recently diagnosed and documented incision problems on several rivers, paving the way for solutions tailored to this specific issue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Could you tell an incising channel apart from lateral bank migration? Are you confident that the experts you hired took this issue into account and that the proposed solutions will be suitable and durable?<\/p>\n\n\n\n<h2 id=\"faq\" class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is channel incision?<\/summary>\n<p class=\"wp-block-paragraph\">Channel incision is the progressive erosion and lowering of a river\u2019s bed. As the bed drops, the banks become too steep and collapse, which causes riverbank erosion.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is the difference between channel incision and lateral river migration?<\/summary>\n<p class=\"wp-block-paragraph\">Lateral migration is the sideways movement of a river through bank erosion, a process now accounted for in Quebec\u2019s flood and mobility zone mapping. Channel incision is the downcutting of the riverbed, which destabilizes the banks; it is very difficult to identify without a site visit by a fluvial geomorphology specialist.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What causes channel incision?<\/summary>\n<p class=\"wp-block-paragraph\">Channel incision results from an imbalance between the sediment entering and leaving a river reach. It occurs when the river receives too little sediment from upstream, for example because of riprap, or when flows increase during floods; both causes often act together.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Why doesn\u2019t riprap fix bank erosion caused by channel incision?<\/summary>\n<p class=\"wp-block-paragraph\">In an incising channel, riprap and other conventional bank stabilization techniques perform poorly because they do not address the root cause. They can even worsen incision and force structures to be rebuilt again and again.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>How does channel incision affect natural environments?<\/summary>\n<p class=\"wp-block-paragraph\">Channel incision disconnects a river from its floodplain, directly affecting the natural habitats found there. It reduces biodiversity and makes the river less resilient to major floods.<\/p>\n<\/details>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-fe48e5de wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.avizo.ca\/en\/contact-us\/\">Get your watercourse assessed<\/a><\/div>\n<\/div>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@graph\": [\n    {\n      \"@type\": \"Article\",\n      \"headline\": \"Channel Incision: The Overlooked Cause of Riverbank Erosion\",\n      \"inLanguage\": \"en-CA\",\n      \"datePublished\": \"2026-11-06\",\n      \"author\": {\n        \"@type\": \"Organization\",\n        \"name\": \"Avizo Experts-Conseils\"\n      },\n      \"publisher\": {\n        \"@type\": \"Organization\",\n        \"name\": \"Avizo Experts-Conseils\",\n        \"url\": \"https:\/\/www.avizo.ca\"\n      },\n      \"about\": [\n        \"Channel incision\",\n        \"Riverbank erosion\",\n        \"Fluvial geomorphology\"\n      ]\n    },\n    {\n      \"@type\": \"FAQPage\",\n      \"inLanguage\": \"en-CA\",\n      \"mainEntity\": [\n        {\n          \"@type\": \"Question\",\n          \"name\": \"What is channel incision?\",\n          \"acceptedAnswer\": {\n            \"@type\": \"Answer\",\n            \"text\": \"Channel incision is the progressive erosion and lowering of a river\u2019s bed. 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Two types of riverbank erosion that are easily [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.avizo.ca\/en\/2026\/11\/11\/channel-incision-riverbank-erosion\/\">Read More&#8230;<span class=\"screen-reader-text\"> from Channel Incision: The Overlooked Cause of Riverbank Erosion<\/span><\/a><\/p>\n","protected":false},"author":4,"featured_media":41907,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[437,440],"tags":[513],"authors":[433],"class_list":["post-41871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydrogeomorphology","category-natural-environments-and-watercourses","tag-environnement-etiquette","authors-michel-paquette"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Channel Incision: The Overlooked Cause of Riverbank Erosion - Avizo<\/title>\n<meta name=\"description\" content=\"Channel incision is a common yet misdiagnosed cause of riverbank erosion. 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