{"id":18911,"date":"2022-12-16T10:38:11","date_gmt":"2022-12-16T05:08:11","guid":{"rendered":"https:\/\/iihs.co.in\/knowledge-gateway\/?p=18911"},"modified":"2022-12-16T10:45:42","modified_gmt":"2022-12-16T05:15:42","slug":"invasion-of-natural-grasslands-by-exotic-trees-increases-flood-risks-in-mountainous-landscapes-in-south-india","status":"publish","type":"post","link":"https:\/\/iihs.co.in\/knowledge-gateway\/invasion-of-natural-grasslands-by-exotic-trees-increases-flood-risks-in-mountainous-landscapes-in-south-india\/","title":{"rendered":"Invasion of Natural Grasslands by Exotic Trees Increases Flood Risks in Mountainous Landscapes in South India"},"content":{"rendered":"<div id='full_slider_1'  class='avia-fullwidth-slider main_color avia-shadow   avia-builder-el-0  el_before_av_layout_row  avia-builder-el-first   container_wrap sidebar_right'  ><div  class='avia-slideshow av-5dav3fj-1ff435b495f233800cc8be7200f174f1 avia-slideshow-featured av_slideshow_full avia-fade-slider 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class='flex_cell_inner'><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-lbq1kt11-9f0ac5a508ca3abd4196ff85f281cf99\">\n#top .av-special-heading.av-lbq1kt11-9f0ac5a508ca3abd4196ff85f281cf99{\npadding-bottom:10px;\n}\nbody .av-special-heading.av-lbq1kt11-9f0ac5a508ca3abd4196ff85f281cf99 .av-special-heading-tag .heading-char{\nfont-size:25px;\n}\n.av-special-heading.av-lbq1kt11-9f0ac5a508ca3abd4196ff85f281cf99 .av-subheading{\nfont-size:15px;\n}\n<\/style>\n<div  class='av-special-heading av-lbq1kt11-9f0ac5a508ca3abd4196ff85f281cf99 av-special-heading-h3  avia-builder-el-5  el_before_av_textblock  avia-builder-el-first '><h3 class='av-special-heading-tag '  itemprop=\"headline\"  >Invasion of Natural Grasslands by Exotic Trees Increases Flood Risks in Mountainous Landscapes in South India<\/h3><div class=\"special-heading-border\"><div class=\"special-heading-inner-border\"><\/div><\/div><\/div><br \/>\n<section  class='av_textblock_section av-lbq1plo0-150478ea7d3a74b5029a97666ede1f1c '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p><span style=\"font-size: 13px; text-transform: none; color: #8a0000;\"><em>Rajat Ramakant Nayaka, <a href=\"https:\/\/iihs.co.in\/iihs-people\/team\/jagdish-krishnaswamy\/\" target=\"_blank\" rel=\"noopener\">Jagdish Krishnaswamy<\/a>, Srinivas Vaidyanathana, Nick A Chappell, Ravinder Singh Bhallaa\u00a0<\/em>| 2023<\/span><\/p>\n<\/div><\/section><br \/>\n<section  class='av_textblock_section av-lbq1rr6c-f65fa03cd5f0b48a9036ed6f3d774d93 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/BlogPosting\" itemprop=\"blogPost\" ><div class='avia_textblock'  itemprop=\"text\" ><p>Abstract<\/p>\n<p>Invasive trees in catchments around the world are a source of concern due to their hydrological and ecological impacts. A large number of studies have focused on their impact on dry-season stream discharge due to enhanced transpiration. The impact of invasive trees on stream discharge and flood risk during extreme rain events, which are becoming more frequent due to climate change, has not been addressed adequately. We examined the influence of land-cover, canopy cover, and other catchment morphological characteristics on stream discharges in hilly catchments during light, heavy, and extreme rain events. Three years of rainfall-runoff observations, between January 2014 and December 2016, were collected in eleven neighbouring mountainous catchments in Nilgiris, South India. Each catchment had a distinct land cover, namely shola forests, montane grasslands, and catchments invaded by wattle (<em>Acacia mearnsii<\/em>). Hourly rain intensities between the percentiles 25-90, 90-95 and over 95 were categorised as light, heavy and extreme respectively, and were used to study hourly peak stream discharge responses. We compared discharge between native grassland catchments and grassland catchments invaded by wattle. Discharge rates were corrected for the catchment area. We found that land cover and canopy-cover influenced the hydrologic response to extreme rain events. Regression models with flood event as the response variable suggested an increase in rainfall-runoff response with an increase in canopy cover. The maximum hourly discharge observed in the reference grassland catchment (0.00098 mm s<sup>-1<\/sup>) was lower than the maximum discharge observed in low density (0.00529 mm s<sup>-1<\/sup>) and high density (0.00497 mm s<sup>-1<\/sup>) wattle catchments. At higher discharges, the flood magnitude in wattle invaded catchments was much greater than that in the grassland catchment for a given flood frequency &#8211; indicating a higher risk of severe flooding in wattle-dominated catchments. We attribute the enhanced flood discharges to the effects of spreading wattle roots on the enhancement of rapid, shallow sub-surface flows in invaded catchments. Catchments dominated by shallow sub-surface flows are known to have reduced water retention times in response to high rain intensities. Antecedent moisture conditions and drainage density were other factors that influenced the local rainfall-runoff relationships. In the Western Ghats and other parts of India grasslands have been planted with exotic woody trees, and some have become invasive. Our study indicates that replacing grasslands with woody plants at landscape scales, could affect hydrological processes and could increase flood risks during the monsoon, especially in mountainous regions. Management of invaded catchments by regulation of wattle and restoration of semi-natural grassland, combined with the installation of early warning systems in these impacted areas will help reduce flood risk during extreme rain under climate change.<\/p>\n<\/div><\/section><br \/>\n<div  class='avia-button-wrap av-lbq1sh4u-caeb5bdd587d4f3ac85c48e5bee5d388-wrap avia-button-left  avia-builder-el-8  el_after_av_textblock  el_before_av_hr '><a href='https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0022169422015141'  class='avia-button av-lbq1sh4u-caeb5bdd587d4f3ac85c48e5bee5d388 av-link-btn avia-icon_select-yes-left-icon avia-size-medium avia-position-left avia-color-theme-color'  target=\"_blank\"  rel=\"noopener noreferrer\"  aria-label=\"Access Paper\"><span class='avia_button_icon avia_button_icon_left avia-iconfont avia-font-entypo-fontello' data-av_icon='\ue82d' data-av_iconfont='entypo-fontello' ><\/span><span class='avia_iconbox_title' >Access 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class=\"tag-cloud-link tag-link-13 tag-link-position-22\" style=\"font-size: 18pt;\" aria-label=\"Housing (27 items)\">Housing<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/human-development\/\" class=\"tag-cloud-link tag-link-100 tag-link-position-23\" style=\"font-size: 15.652173913043pt;\" aria-label=\"Human Development (14 items)\">Human Development<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/illness-narratives\/\" class=\"tag-cloud-link tag-link-210 tag-link-position-24\" style=\"font-size: 8pt;\" aria-label=\"Illness narratives (1 item)\">Illness narratives<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/industrial-policy\/\" class=\"tag-cloud-link tag-link-80 tag-link-position-25\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Industrial Policy (2 items)\">Industrial Policy<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/instructional-design\/\" class=\"tag-cloud-link tag-link-150 tag-link-position-26\" 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href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/migration\/\" class=\"tag-cloud-link tag-link-234 tag-link-position-31\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"migration (2 items)\">migration<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/non-economic-loss\/\" class=\"tag-cloud-link tag-link-194 tag-link-position-32\" style=\"font-size: 8pt;\" aria-label=\"Non-Economic Loss (1 item)\">Non-Economic Loss<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/planning\/\" class=\"tag-cloud-link tag-link-106 tag-link-position-33\" style=\"font-size: 17.565217391304pt;\" aria-label=\"Planning (24 items)\">Planning<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/pluralism\/\" class=\"tag-cloud-link tag-link-209 tag-link-position-34\" style=\"font-size: 8pt;\" aria-label=\"Pluralism (1 item)\">Pluralism<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/policies\/\" class=\"tag-cloud-link tag-link-146 tag-link-position-35\" style=\"font-size: 10.608695652174pt;\" aria-label=\"Policies (3 items)\">Policies<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/poverty-and-inequality\/\" class=\"tag-cloud-link tag-link-101 tag-link-position-36\" style=\"font-size: 17.391304347826pt;\" aria-label=\"Poverty and Inequality (23 items)\">Poverty and Inequality<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/risk\/\" class=\"tag-cloud-link tag-link-97 tag-link-position-37\" style=\"font-size: 16.521739130435pt;\" aria-label=\"Risk (18 items)\">Risk<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/sanitation\/\" class=\"tag-cloud-link tag-link-67 tag-link-position-38\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Sanitation (2 items)\">Sanitation<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/scholarly-publishing\/\" class=\"tag-cloud-link tag-link-130 tag-link-position-39\" style=\"font-size: 9.5652173913043pt;\" aria-label=\"Scholarly Publishing (2 items)\">Scholarly Publishing<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/science-gaps\/\" class=\"tag-cloud-link tag-link-193 tag-link-position-40\" style=\"font-size: 8pt;\" aria-label=\"Science Gaps (1 item)\">Science Gaps<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/sustainability\/\" class=\"tag-cloud-link tag-link-93 tag-link-position-41\" style=\"font-size: 12.782608695652pt;\" aria-label=\"Sustainability (6 items)\">Sustainability<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/training-manual\/\" class=\"tag-cloud-link tag-link-242 tag-link-position-42\" style=\"font-size: 10.608695652174pt;\" aria-label=\"Training manual (3 items)\">Training manual<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/transport\/\" class=\"tag-cloud-link tag-link-95 tag-link-position-43\" style=\"font-size: 12.173913043478pt;\" aria-label=\"Transport (5 items)\">Transport<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/urbanisation\/\" class=\"tag-cloud-link tag-link-88 tag-link-position-44\" style=\"font-size: 12.782608695652pt;\" aria-label=\"Urbanisation (6 items)\">Urbanisation<\/a>\n<a href=\"https:\/\/iihs.co.in\/knowledge-gateway\/tag\/water-and-sanitation\/\" class=\"tag-cloud-link tag-link-96 tag-link-position-45\" style=\"font-size: 18.086956521739pt;\" aria-label=\"Water and Sanitation (28 items)\">Water and Sanitation<\/a><\/div>\n<\/div><\/div><\/p>\n<\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p><em>Rajat Ramakant Nayaka, Jagdish Krishnaswamy, Srinivas Vaidyanathana, Nick A Chappell, Ravinder Singh Bhallaa<\/em><\/p>\n<hr\/>\n","protected":false},"author":6,"featured_media":10245,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[71],"tags":[],"class_list":["post-18911","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-paper"],"_links":{"self":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/posts\/18911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/comments?post=18911"}],"version-history":[{"count":0,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/posts\/18911\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/media\/10245"}],"wp:attachment":[{"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/media?parent=18911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/categories?post=18911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iihs.co.in\/knowledge-gateway\/wp-json\/wp\/v2\/tags?post=18911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}