{"id":4929,"date":"2026-07-09T14:52:53","date_gmt":"2026-07-09T14:52:53","guid":{"rendered":"https:\/\/www.andex-rhp.org\/?p=4929"},"modified":"2026-07-09T14:52:55","modified_gmt":"2026-07-09T14:52:55","slug":"menos-agua-mas-sedimentos-y-mayor-salinidad-el-impacto-de-la-megasequia-en-los-rios-de-los-andes-centrales","status":"publish","type":"post","link":"https:\/\/www.andex-rhp.org\/?p=4929","title":{"rendered":"Menos agua, m\u00e1s sedimentos y mayor salinidad: el impacto de la megasequ\u00eda en los r\u00edos de los Andes Centrales"},"content":{"rendered":"\n<p><strong>Por Jos\u00e9 G. Le\u00f3n* &amp; Karina L. Lecomte**\/<\/strong><\/p>\n\n\n\n<p>Las monta\u00f1as abastecen de agua dulce a miles de millones de personas. En los Andes, gran parte de esa disponibilidad depende de la nieve y los glaciares, que act\u00faan como reservorios naturales al acumular agua durante el invierno y liberarla gradualmente en primavera y verano. Sin embargo, el cambio clim\u00e1tico est\u00e1 modificando este funcionamiento. La megasequ\u00eda que afecta a los Andes Centrales desde 2010, la m\u00e1s prolongada registrada en siglos, ha reducido la acumulaci\u00f3n de nieve, acelerado la p\u00e9rdida de masa glaciar y disminuido los caudales de numerosos r\u00edos que abastecen a las sociedades andinas. Aunque estos cambios en la cantidad de agua han sido ampliamente documentados, a\u00fan existe escasa informaci\u00f3n sobre c\u00f3mo afectan la calidad del agua y el transporte de sedimentos, dos componentes esenciales para comprender el funcionamiento de los r\u00edos y gestionar adecuadamente el recurso h\u00eddrico.<\/p>\n\n\n\n<p>Esta problem\u00e1tica adquiere especial relevancia en los r\u00edos que nacen en los Andes Centrales bajo un clima semi\u00e1rido, donde el agua del deshielo interact\u00faa con una geolog\u00eda rica en rocas sedimentarias y evapor\u00edticas. La interacci\u00f3n entre el agua, las rocas y la din\u00e1mica hidrol\u00f3gica favorece una elevada mineralizaci\u00f3n natural. El r\u00edo Tunuy\u00e1n constituye un ejemplo representativo de esta configuraci\u00f3n lito-hidroclim\u00e1tica y ofrece una oportunidad para analizar c\u00f3mo una megasequ\u00eda prolongada condiciona el transporte de sedimentos y solutos, as\u00ed como la calidad del agua.<\/p>\n\n\n\n<p>En este trabajo se analiz\u00f3 una base de datos de 30 a\u00f1os (1995\u20132024) que incluye registros de caudal, nieve, material particulado en suspensi\u00f3n y composici\u00f3n qu\u00edmica del agua. El objetivo fue evaluar c\u00f3mo la megasequ\u00eda modific\u00f3 el transporte de sedimentos y solutos, y determinar si estos cambios implicaban una reorganizaci\u00f3n del funcionamiento hidrogeoqu\u00edmico del sistema o una intensificaci\u00f3n de procesos ya existentes.<\/p>\n\n\n\n<p>La disminuci\u00f3n del caudal y la atenuaci\u00f3n de los pulsos de deshielo redujeron significativamente la cantidad total de sedimentos y sales disueltas transportadas por el r\u00edo. Sin embargo, el agua present\u00f3 concentraciones considerablemente mayores. Entre los a\u00f1os h\u00famedos y secos, las concentraciones de sedimentos aumentaron alrededor de un 240 %, mientras que las de s\u00f3lidos disueltos crecieron cerca de un 30 %, principalmente por el enriquecimiento en sodio y cloruros.<\/p>\n\n\n\n<p>A pesar de estos cambios, las relaciones fundamentales entre el caudal y la calidad del agua permanecieron pr\u00e1cticamente inalteradas. Esto indica que la megasequ\u00eda no modific\u00f3 los procesos hidrogeoqu\u00edmicos que controlan la composici\u00f3n del agua, sino que intensific\u00f3 su expresi\u00f3n al operar sobre un sistema con menor disponibilidad de agua y menor capacidad de diluci\u00f3n. En otras palabras, durante la megasequ\u00eda el r\u00edo transport\u00f3 menos sedimentos y sales debido a la reducci\u00f3n del caudal, pero el agua que circul\u00f3 fue m\u00e1s mineralizada y present\u00f3 mayores concentraciones de sedimentos.<\/p>\n\n\n\n<p>Estos resultados sugieren que, al menos en este tipo de cuencas andinas, la megasequ\u00eda act\u00faa principalmente como un amplificador de procesos hidrogeoqu\u00edmicos preexistentes, m\u00e1s que como un agente capaz de reorganizar el funcionamiento del sistema. Comprender esta diferencia es fundamental para anticipar la respuesta de la calidad del agua y del transporte fluvial frente a un clima cada vez m\u00e1s c\u00e1lido y seco, y para dise\u00f1ar estrategias de monitoreo y gesti\u00f3n adaptadas a los r\u00edos de los Andes Centrales.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.andex-rhp.org\/wp-content\/uploads\/2026\/07\/MegasequiaCalidadAguaAndesCentrales-1024x683.png\" alt=\"\" class=\"wp-image-4927\" srcset=\"https:\/\/www.andex-rhp.org\/wp-content\/uploads\/2026\/07\/MegasequiaCalidadAguaAndesCentrales-1024x683.png 1024w, https:\/\/www.andex-rhp.org\/wp-content\/uploads\/2026\/07\/MegasequiaCalidadAguaAndesCentrales-300x200.png 300w, https:\/\/www.andex-rhp.org\/wp-content\/uploads\/2026\/07\/MegasequiaCalidadAguaAndesCentrales-768x512.png 768w, https:\/\/www.andex-rhp.org\/wp-content\/uploads\/2026\/07\/MegasequiaCalidadAguaAndesCentrales.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>*Instituto Nacional del Agua, Centro de la Regi\u00f3n Semi\u00e1rida, Villa Carlos Paz, Argentina<\/p>\n\n\n\n<p>**Facultad de Ciencias Exactas, F\u00edsicas y Naturales (FCEFyN), Universidad Nacional de C\u00f3rdoba (UNC), C\u00f3rdoba, Argentina<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Le\u00f3n,\u00a0J. G., and\u00a0\u00a0K. L. Lecomte.\u00a0\u00a02026. \u201c\u00a0<em>Megadrought-Amplified River Geochemical Export in the Central Andes<\/em>.\u201d\u00a0<em>Hydrological Processes<\/em>\u00a0\u00a040, no.\u00a06: e70594.\u00a0<a href=\"https:\/\/doi.org\/10.1002\/hyp.70594\">https:\/\/doi.org\/10.1002\/hyp.70594<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Por Jos\u00e9 G. Le\u00f3n* &amp; Karina L. Lecomte**\/ Las monta\u00f1as abastecen de agua dulce a miles de millones de personas. En los Andes, gran parte de esa disponibilidad depende de la nieve y los glaciares, que act\u00faan como reservorios naturales al acumular agua durante el invierno y liberarla gradualmente en primavera y verano. Sin embargo, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[16],"tags":[210,112,174],"class_list":["post-4929","post","type-post","status-publish","format-standard","hentry","category-lecturas","tag-agua","tag-andes-centrales","tag-megasequia","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Menos agua, m\u00e1s sedimentos y mayor salinidad: el impacto de la megasequ\u00eda en los r\u00edos de los Andes Centrales - Programa Hidroclim\u00e1tico Regional para los Andes<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.andex-rhp.org\/?p=4929\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Menos agua, m\u00e1s sedimentos y mayor salinidad: el impacto de la megasequ\u00eda en los r\u00edos de los Andes Centrales - Programa Hidroclim\u00e1tico Regional para los Andes\" \/>\n<meta property=\"og:description\" content=\"Por Jos\u00e9 G. Le\u00f3n* &amp; Karina L. Lecomte**\/ Las monta\u00f1as abastecen de agua dulce a miles de millones de personas. En los Andes, gran parte de esa disponibilidad depende de la nieve y los glaciares, que act\u00faan como reservorios naturales al acumular agua durante el invierno y liberarla gradualmente en primavera y verano. 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Le\u00f3n* &amp; Karina L. Lecomte**\/ Las monta\u00f1as abastecen de agua dulce a miles de millones de personas. En los Andes, gran parte de esa disponibilidad depende de la nieve y los glaciares, que act\u00faan como reservorios naturales al acumular agua durante el invierno y liberarla gradualmente en primavera y verano. 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