{"id":20020511,"date":"2016-10-27T12:30:44","date_gmt":"2016-10-27T07:00:44","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?p=20511"},"modified":"2021-07-21T19:53:19","modified_gmt":"2021-07-21T14:23:19","slug":"vanishing-mekong-shifting-tropical-storms-threaten-a-great-river-delta","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/climate\/vanishing-mekong-shifting-tropical-storms-threaten-a-great-river-delta\/","title":{"rendered":"Vanishing Mekong? Shifting tropical storms threaten a great river delta"},"content":{"rendered":"<p>This is one of the world\u2019s great deltas. It is home to more than 20 million people and the rice that is grown on its fertile land underpins food security across South-East Asia.<\/p>\n<p>Working with colleagues from the UK, US and Finland, we\u2019ve just published a paper in <a href=\"http:\/\/nature.com\/articles\/doi:10.1038\/nature19809\">Nature<\/a>, which shows that fewer tropical storms have been hitting the Mekong catchment in recent years. This in turn results in much less mud and sand reaching the delta. We\u2019re worried that this could have dramatic effects on the delta\u2019s sustainability in the medium and longer term due to the adverse impacts on flooding and reduced agricultural productivity.<\/p>\n<p>The world\u2019s deltas are facing a sustainability crisis: 28 of the 33 largest are at <a href=\"http:\/\/www.nature.com\/ngeo\/journal\/v2\/n10\/abs\/ngeo629.html\">risk of \u201cdrowning\u201d<\/a> as a result of rising relative sea-levels. Deltas naturally sink slowly under their own weight, but under normal conditions the sediments supplied from the rivers that feed them are deposited, maintaining the delta surface above sea-level.<\/p>\n<figure class=\"align-right zoomable\">\n<figure style=\"width: 237px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/62e528761d0685343e1c-f3d1b99a743ffa4142d9d7f1978d9686.ssl.cf2.rackcdn.com\/files\/142398\/area14mp\/image-20161019-20313-1mnhod8.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/62e528761d0685343e1c-f3d1b99a743ffa4142d9d7f1978d9686.ssl.cf2.rackcdn.com\/files\/142398\/width237\/image-20161019-20313-1mnhod8.jpg\" width=\"237\" height=\"271\" \/><\/a><figcaption class=\"wp-caption-text\">The Mekong flows from Tibet to Vietnam. Shannon1 \/ wiki, CC BY-SA<\/figcaption><\/figure>\n<div class=\"enlarge_hint\"><\/div>\n<\/figure>\n<p>However, the rate of sea-level rise is accelerating as a consequence of climate change warming the oceans, and drilling for oil and gas or the \u201cmining\u201d of groundwater is causing rapid subsidence. Meanwhile, the sediment loads in many rivers are declining as a result of human activities upstream \u2013 the large-scale development of dams being a particular issue in many river systems.<\/p>\n<p>The Mekong faces many of these challenges \u2013 and the IPCC has recognised it (along with the Ganges-Brahmaputra and Nile deltas) as one of the <a href=\"https:\/\/www.ipcc.ch\/pdf\/assessment-report\/ar4\/wg2\/ar4-wg2-chapter6.pdf\">three most vulnerable to climate change<\/a>. The sustainability of the delta is critical to the lives and livelihoods of local residents, many of whom are poor. River sediment represents a critical resource for building delta lands, reducing flooding and maintaining fertile soils.<\/p>\n<h2>How we know sediment is declining<\/h2>\n<p>Our work had two main components. First we carried out an extensive programme of fieldwork to quantify the Mekong\u2019s sediment load under varying conditions (including, in September 2013, during one of the largest floods on record, which itself was generated by a typhoon), so that we could link water and sediment flows.<\/p>\n<figure class=\"align-center zoomable\"><a href=\"https:\/\/62e528761d0685343e1c-f3d1b99a743ffa4142d9d7f1978d9686.ssl.cf2.rackcdn.com\/files\/142403\/area14mp\/image-20161019-20298-1jnj37j.jpg\"><img decoding=\"async\" src=\"https:\/\/62e528761d0685343e1c-f3d1b99a743ffa4142d9d7f1978d9686.ssl.cf2.rackcdn.com\/files\/142403\/width754\/image-20161019-20298-1jnj37j.jpg\" alt=\"\" \/><\/a><figcaption><span class=\"caption\">Floods in 2013 killed at least 100 and affected millions more.<\/span> <span class=\"attribution\"><span class=\"source\">Mak Remissa \/ EPA<\/span><\/span><\/figcaption><div class=\"enlarge_hint\"><\/div>\n<\/figure>\n<p>The second aspect of our work traced the frequency and location of tropical storms that have tracked over the Mekong basin in the past 30 years or so. Working with our colleagues in Finland we used this information to run a computer model of the flows of water through the whole Mekong catchment, taking into account scenarios \u201cwith\u201d and \u201cwithout\u201d tropical storms.<\/p>\n<p>Our results showed just how crucial tropical storms are in maintaining the Mekong delta. Only around 5% of the catchment area\u2019s total annual rainfall is sourced from storms, but because this heavy and sudden rainfall is so effective at washing mud and sand into the river, the storms are responsible for more than 30% of the sediment that reaches the delta.<\/p>\n<p>Future climate models predict that tropical storms, such as the so-called <a href=\"https:\/\/weather.com\/storms\/typhoon\/news\/super-typhoon-haima-lawin-philippines-china-forecast\">\u201cSuper Typhoon\u201d Haima<\/a> which, at the time of writing, is tracking towards the Philippines, are going to get stronger and more frequent as oceans warm up. However, these models also project that their typical track locations will <a href=\"http:\/\/link.springer.com\/article\/10.1007\/s00382-014-2450-8\">shift north and eastwards<\/a> towards China, so that in the future it is likely that fewer storms will cross the Mekong\u2019s catchment.<\/p>\n<p><a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0169555X14003560\">Sand mining<\/a> is already reducing the sediment being delivered to the Mekong delta and further reductions are anticipated as a result of <a href=\"http:\/\/www.sciencedirect.com\/science\/article\/pii\/S0169555X06003229\">future damming<\/a> upstream. Therefore, if the storm projections are correct and even less sediment is washed downstream, the delta\u2019s prospects look bleak.<\/p>\n<figure class=\"align-center zoomable\"><a href=\"https:\/\/62e528761d0685343e1c-f3d1b99a743ffa4142d9d7f1978d9686.ssl.cf2.rackcdn.com\/files\/142406\/area14mp\/image-20161019-20298-bmt099.JPG\"><img decoding=\"async\" src=\"https:\/\/62e528761d0685343e1c-f3d1b99a743ffa4142d9d7f1978d9686.ssl.cf2.rackcdn.com\/files\/142406\/width754\/image-20161019-20298-bmt099.JPG\" alt=\"\" \/><\/a><figcaption><span class=\"caption\">The Mekong Delta is on shaky foundations.<\/span> <span class=\"attribution\"><span class=\"source\">Jim Best<\/span>, <span class=\"license\">Author provided<\/span><\/span><\/figcaption><div class=\"enlarge_hint\"><\/div>\n<\/figure>\n<p>Our study is the first to show the significant role tropical storms can have in the delivery of sediment to large river deltas. This has implications for a range of other major rivers, such as the Ganges in Bangladesh, the Yangtze in China, and the Mississippi in the US. All of these have catchments that are regularly struck by tropical storms. Some 500 million people live and work in the world\u2019s major river deltas \u2013 and our work shows we can\u2019t evaluate their future vulnerability to sea-level rise without also considering changes in the storms that feed the deltas.<\/p>\n<p><em><span class=\"fn author-name\">Stephen Darby\u00a0is\u00a0<\/span>Professor of Physical Geography, University of Southampton;\u00a0<span class=\"fn author-name\">Daniel Parsons\u00a0is\u00a0<\/span>Professor of Process Sedimentology and Associate Dean for Research (Science and Engineering), University of Hull;\u00a0<span class=\"fn author-name\">Julian Leyland\u00a0is\u00a0<\/span>Lecturer in Physical Geography, University of Southampton.<\/em><\/p>\n<p><em>Chris Hackney, Andrew Nicholas, Rolf Aalto, Matti Kummu and Jim Best also contributed to this research.<\/em><\/p>\n<p><em>The article was first published on t<a href=\"http:\/\/theconversation.com\/vanishing-mekong-shifting-tropical-storms-threaten-a-great-river-delta-67342\">he Conversation<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recent changes in the patterns of tropical storms are threatening the future of the Mekong River delta in Vietnam and South Asia faces similar threats<\/p>\n","protected":false},"author":581,"featured_media":20017633,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761],"tags":[519,50040314,20000155,50040707],"hashtags":[],"country":[20029278,20000110,20028095,20029326,20028207],"class_list":["post-20020511","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","tag-climate-impacts","tag-dams","tag-mekong","tag-the-third-pole","country-cambodia","country-china","country-laos","country-thailand","country-vietnam"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vanishing Mekong? 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