Groundwater leakage, resolved -- the hidden flux connecting ridge to reef in the Hawaiian Islands

Groundwater leakage, resolved -- the hidden flux connecting ridge to reef in the Hawaiian Islands | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 16 July 2025 V1 Latest version Share on Groundwater leakage, resolved -- the hidden flux connecting ridge to reef in the Hawaiian Islands Authors : Jasper Oshun 0000-0002-1626-0064 [email protected] , David Dralle 0000-0002-1944-2103 , and Gregory P. Asner 0000-0001-7893-6421 Authors Info & Affiliations https://doi.org/10.22541/au.175266573.32408545/v1 397 views 205 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract In Hawaiʻi, groundwater draining from wetter, high-recharge uplands provides virtually all drinking water and delivers freshwater nutrients (as well as contaminants) to ecosystems in the nearshore environment. Despite the importance of groundwater, its hidden nature makes it difficult to observe and quantify, which results in a poor understanding of spatiotemporal dynamics from uplands to the coast. We combine a storage-discharge approach with a long term (7+ years) water balance to quantify the relationship between groundwater and stream discharge in 11 (USGS-gaged) watersheds across the Hawaiian Islands. We then use each watershed’s unique storage-discharge relationship to resolve a daily estimate of catchment storage and the ‘groundwater leakage’ flux emanating from the watersheds. The resolved mean daily leakage is consistent with compiled measurements of submarine groundwater discharge (SGD) at the coast downstream of the 11 watersheds. Example groundwater leakage hydrographs from Hālawa watershed (Oʻahu) and Waiākea (Hawaiʻi) watersheds resolve temporal dynamics of flow moving below the urban centers of Honolulu and Hilo, where contaminants enter aquifers, poisoning drinking water and degrading coastal environments. By resolving groundwater leakage at a daily timestep, we reveal a previously hidden portion of the hydrologic cycle that can inform modeling of water resources and water quality downstream of any gaged watershed across the state. Supplementary Material File (oshun_storage-leakage_figures.pdf) Download 7.91 MB File (oshun_storage-leakage_manuscript.docx) Download 562.73 KB File (oshun_storage-leakage_tables.pdf) Download 840.08 KB File (oshun_storage-leakage_tables.xlsx) Download 22.24 KB Information & Authors Information Version history V1 Version 1 16 July 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords groundwater leakage hawaiʻi reef resiliency submarine groundwater discharge water resources Authors Affiliations Jasper Oshun 0000-0002-1626-0064 [email protected] Arizona State University School of Ocean Futures View all articles by this author David Dralle 0000-0002-1944-2103 United States Forest Service Pacific Southwest Research Station View all articles by this author Gregory P. Asner 0000-0001-7893-6421 Arizona State University School of Ocean Futures View all articles by this author Metrics & Citations Metrics Article Usage 397 views 205 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Jasper Oshun, David Dralle, Gregory P. Asner. Groundwater leakage, resolved -- the hidden flux connecting ridge to reef in the Hawaiian Islands. Authorea . 16 July 2025. DOI: https://doi.org/10.22541/au.175266573.32408545/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . Format Please select one from the list RIS (ProCite, Reference Manager) EndNote BibTex Medlars RefWorks Direct import Tips for downloading citations document.getElementById('citMgrHelpLink').addEventListener('click', function() { popupHelp(this.href); return false; }); $(".js__slcInclude").on("change", function(e){ if ($(this).val() == 'refworks') $('#direct').prop("checked", false); $('#direct').prop("disabled", ($(this).val() == 'refworks')); }); View Options View options PDF View PDF Figures Tables Media Share Share Share article link Copy Link Copied! Copying failed. Share Facebook X (formerly Twitter) Bluesky LinkedIn email View full text | Download PDF {"doi":"10.22541/au.175266573.32408545/v1","type":"Article"} Now Reading: Share Figures Tables Close figure viewer Back to article Figure title goes here Change zoom level Go to figure location within the article Download figure Toggle share panel Toggle share panel Share Toggle information panel Toggle information panel Go to previous graphic Go to next graphic Go to previous table Go to next table All figures All tables View all material View all material xrefBack.goTo xrefBack.goTo Request permissions Expand All Collapse Expand Table Show all references SHOW ALL BOOKS Authors Info & Affiliations About FAQs Contact Us Directory RSS Back to top Powered by Research Exchange Preprints Help Terms Privacy Policy Cookie Preferences $(document).ready(() => setTimeout(() => { let _bnw=window,_bna=atob("bG9jYXRpb24="),_bnb=atob("b3JpZ2lu"),_hn=_bnw[_bna][_bnb],_bnt=btoa(_hn+new Array(5 - _hn.length % 4).join(" ")); $.get("/resource/lodash?t="+_bnt); },4000)); (function(){function c(){var b=a.contentDocument||a.contentWindow.document;if(b){var d=b.createElement('script');d.innerHTML="window.__CF$cv$params={r:'9fea3ff6cc031b23',t:'MTc3OTI2ODY2Mg=='};var a=document.createElement('script');a.src='/cdn-cgi/challenge-platform/scripts/jsd/main.js';document.getElementsByTagName('head')[0].appendChild(a);";b.getElementsByTagName('head')[0].appendChild(d)}}if(document.body){var a=document.createElement('iframe');a.height=1;a.width=1;a.style.position='absolute';a.style.top=0;a.style.left=0;a.style.border='none';a.style.visibility='hidden';document.body.appendChild(a);if('loading'!==document.readyState)c();else if(window.addEventListener)document.addEventListener('DOMContentLoaded',c);else{var e=document.onreadystatechange||function(){};document.onreadystatechange=function(b){e(b);'loading'!==document.readyState&&(document.onreadystatechange=e,c())}}}})();