Restoration of Freshwater Inflows: the Use of Spatial Analysis for Hydrologic Planning in the Anahuac National Wildlife Refuge, USA

Feagin, Rusty A.; Johns, Norman D.; Huff, Thomas P.; Abdullah, Meshal M.; Fritz-Grammond, Kristin

doi:10.1007/s13157-020-01318-0

Cited by 4 publications

(3 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its existence could not have otherwise been confirmed from optimal imagery or fieldwork. The management measures required to improve water circulation and connectivity vary depending on the wetland and the specific environmental problems generated by the undesired level of hydrological connectivity (See as examples Adeli et al, 2020; Feagin, Johns, Huff, Abdullah, & Fritz‐Grammond, 2020; Lee, Yuan, & Jung, 2020; Siles, Trudel, Peters, & Leconte, 2020; Wemple et al, 2017). Dredging can be used to remove sediments or installing culvert pipes across the ditch may help to improve the connectivity of this area.…”

Section: Discussionmentioning

confidence: 99%

Using InSAR to identify hydrological connectivity and barriers in a highly fragmented wetland

Liu

Wang

Aminjafari

et al. 2020

Hydrological Processes

View full text Add to dashboard Cite

Hydrological connectivity is a critical determinant of wetland functions and health, especially in wetlands that have been heavily fragmented and regulated by human activities. However, investigating hydrological connectivity in these wetlands is challenging due to the costs of high-resolution and large-scale monitoring required in order to identify hydrological barriers within the wetlands. To overcome this challenge, we here propose an interferometric synthetic aperture radar (InSAR)-based methodology to map hydrologic connectivity and identify hydrological barriers in fragmented wetlands. This methodology was applied along 70 transects across the Baiyangdian, the largest freshwater wetland in northern China, using Sentinel 1A and 1B data, covering the period 2016-2019. We generated 58 interferograms providing information on relative water level changes across the transects that showed the high coherence needed for the assessment of hydrological connectivity. We mapped the permanent and conditional (temporary) barriers affecting connectivity. In total, 11% of all transects are permanently disconnected by hydrological barriers across all interferograms and 58% of the transects are conditionally disconnected. Areas covered by reed grasslands show the most undisturbed hydrological connectivity while some of these barriers are the result of ditches and channels within the wetland and low water levels during different periods of the year. This study highlights the potential of the application of Wetland InSAR to determine hydrological connectivity and location of hydrological barriers in highly fragmented wetlands, and facilitates the study of hydrological processes from large spatial scales and long-time scales using remote sensing technique.

show abstract

Section: Discussionmentioning

confidence: 99%

Using InSAR to identify hydrological connectivity and barriers in a highly fragmented wetland

Liu

Wang

Aminjafari

et al. 2020

Hydrological Processes

View full text Add to dashboard Cite

show abstract

“…The combination of spatial technologies provides a template for future work in similar sheet flow-fed landscapes affected by hydrologic disconnection and modification. N/A [158] Monitoring marine and coastal activities…”

Section: Technological Improvements;mentioning

confidence: 99%

The Role of UAS–GIS in Digital Era Governance. A Systematic Literature Review

et al. 2021

View full text Add to dashboard Cite

UAS (Unmanned Aircraft Systems) technologies, also known as UAV (Unmanned Aerial Vehicle), drones, or Remotely Piloted Aircraft System (RPAS) and GIS (Geographic Information System) are recognised for the value of the results that can be achieved by their combined use. However, their use and the results achieved are rarely framed within the context of Digital Era Governance (DEG), an undertaking that would significantly reduce the capabilities of knowledge transfer from the academic and/or private environment to the public domain. The purpose of this study was to highlight, by a bibliometric analysis, the areas of proposed use of this team of tools and the extent to which these can enter the sphere of interest of public administrations, especially local ones. From a methodological point of view, based on the 439 articles filtered from the Web of Science database where UAS/UAV and GIS technologies were used, several bibliometric analyses have emerged. VOSviewer and R (Bibliometrix tool) were used to conduct the bibliometric analyses. Most scientific publications that used UAV technology as a working tool have predominant applicability in photogrammetry, while GIS applications are found in publications dedicated to image processing, landslides, and cultural and archaeological heritage. We point out that from the point of view of international cooperation, at the level of institutions or countries, certain international organisations from the USA, China, and the central and northern European states have a high interest in this topic, and a low cooperation between academia and public administration is exhibited. The conclusion is represented by the apparent lack of framing of the results of UAS–GIS technologies usage into wider and more topical contexts, such as digital era governance, and also a reduced applicability of the research results.

show abstract

“…However, as freshwater inflows are reduced, naturally or anthropogenically, saltwater intrudes further inland into the watershed and can kill or alter wetland and wetlandadjacent vegetation [8]. Wetland losses due to reduced freshwater inflows not only affect the survivability of dependent species [7,9,10], but also have costly economic consequences 2 of 15 due to the loss of irreplaceable ecosystem services, including carbon sequestration [11], flood abatement [12], and water quality improvement [13].…”

Section: Introductionmentioning

confidence: 99%

Hypersalinity in Coastal Wetlands and Potential Restoration Solutions, Lake Austin and East Matagorda Bay, Texas, USA

Feagin,

Lerner,

Noyola

et al. 2024

JMSE

Self Cite

View full text Add to dashboard Cite

When droughts occur, freshwater inputs to coastal wetlands can become scarce and hypersalinity can become a problem. In 2023, a severe drought negatively affected a Texas watershed known as Lake Austin that fed a large expanse of wetlands on East Matagorda Bay. To study the hypersalinity problem in these wetlands, we identified freshwater inflows and mapped vegetation changes over time. We found that from 1943 to 2023, the upper portion of the Lake Austin watershed lost freshwater wetlands to agricultural conversion, and ranged from fresh to brackish, with salinity rapidly rising to a maximum of 31 mS during the summer drought of 2023. The lower portion of the watershed gained saltwater wetlands due to sea level rise, and marshes became hypersaline (64–96 mS) during the 2023 drought, endangering its biota. But after large precipitation events, the entire Lake Austin basin rapidly freshened but then returned to its normal salinities within a week as the tides re-delivered saltwater into its basin. Given current climatic trends, we expect that freshwater inflow will continue to slightly increase for the Lake Austin watershed but also that there will be more extreme periods of episodic drought that negatively affect its wetlands. Accordingly, we assessed several potential restoration actions that would improve freshwater flow and delivery to the Lake Austin coastal wetlands.

show abstract

Restoration of Freshwater Inflows: the Use of Spatial Analysis for Hydrologic Planning in the Anahuac National Wildlife Refuge, USA

Cited by 4 publications

References 44 publications

Using InSAR to identify hydrological connectivity and barriers in a highly fragmented wetland

Using InSAR to identify hydrological connectivity and barriers in a highly fragmented wetland

The Role of UAS–GIS in Digital Era Governance. A Systematic Literature Review

Hypersalinity in Coastal Wetlands and Potential Restoration Solutions, Lake Austin and East Matagorda Bay, Texas, USA

Contact Info

Product

Resources

About