Canalization induced topographic, hydrologic, and land use changes in Olero Creek, Benin River owing to petroleum exploration activities

Ohimain, Elijah I.; Rowland, Eteh Desmond

doi:10.1007/s10661-021-09319-0

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…A logical case can be made, based on these cause-andeffect relationships and others, that canals and their levees, and the fluid extraction made possible beneath them are a major cause of Louisiana's coastal wetlands from the 1930s to the present (Turner and McClenachan, 2018). Similar conclusions about the effect of oil and gas canals are described in the Niger delta by Ohimain and Eteh (2021). Water bodies in the Benin River wetlands (36.4 km 2 ), Niger Delta, that originally accounted for 1.17% of the study area in 1980 increased to 22% in 2020.…”

Section: Introductionmentioning

confidence: 75%

Wetland Restoration Progress 39 Years After Canal Backfilling

Turner

2022

Front. Ecol. Evol.

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Dredging to create canals and channels in wetlands is widespread and is a major cause of dramatically high wetland loss rates in coastal Louisiana. The dredged material placed alongside the canal forms continuous levees and can be dragged back into the canal to start wetland restoration (backfilling) but is rarely done. Thirty-three canals backfilled in the 1980s as opportunistic permit requirements were examined to determine their re-vegetation after 39 years. Sixteen of the 33 disturbed areas are now mostly restored to wetlands, and seventeen were compromised by re-dredging and other factors such as being surrounded by other canals or embedded within water level control structures. Success occurred where the natural hydrology was not artificially constrained by these structures. The re-vegetation of these 16 canals were compared to backfilled canals in the Barataria Preserve of the Jean Lafitte Historical National Park. The spoil bank was restored wetland habitat within a few years, and the open water of the canal was 70% re-vegetated after 39 years if there was no soil “plug” placed at the canal entrance during backfilling. Backfilling canals can be done on the 27 thousand abandoned canals across this coast for a low cost compared to other restoration strategies.

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Section: Introductionmentioning

confidence: 75%

Wetland Restoration Progress 39 Years After Canal Backfilling

Turner

2022

Front. Ecol. Evol.

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“…e lack of public space limits the occurrence of residents' public activities, and residents' resistance to this contradiction is manifested in informal behaviors that are increasingly common in urban public spaces [5]. From the "informal" perspective of the city, the form of informal urban public space and the rich and diverse social behaviors of different groups of users are observed and recorded, and the informal intangible logic is analyzed.…”

Section: Introductionmentioning

confidence: 99%

Construction of 3D Design Model of Urban Public Space Based on ArcGIS Water System Terrain Visualization Data

Liu

2022

Mathematical Problems in Engineering

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On the premise of being familiar with ArcGIS Server technology, we build the architecture of the entire platform, including the basic support layer, data layer, service platform layer, and application layer, and build the entire environment of the platform. We make electronic maps through Arc Map, and collect, organize, and improve spatial data and attribute data, so as to achieve satisfactory accuracy and visual comfort. This study implements various map services under the Dojo framework, including basic map operations, information display and query, marker points, eagle eye diagrams, measurement, printing, and other functions, and uses JavaScript technology to improve user experience. We publish various services through ArcGIS Server, and realize fast and error-free invocation of each service. Based on the theory of runoff and runoff, ArcGIS software was used to study the hydrological information of the watershed, and to determine the catchment area threshold and hydrological response unit. Combined with the GIS spatial analysis method, the numerical simulation of rainfall and runoff in the study case area was carried out, and the variation of the annual rainfall-runoff coefficient was obtained. This study selects an area where stock planning was first proposed as the object of this research. Briefly, we introduce the construction of three-dimensional public space in a certain area, select thirteen typical three-dimensional public spaces as representatives for public evaluation, and explore their existing problems, mainly including the lack of adaptability of space functions and the lack of diversity in space design, privatization of operation management, low level of public perception, etc. Since then, in response to the public problems of the three-dimensional public space in a certain area, a targeted three-dimensional public space optimization strategy is proposed from the four levels of planning policy, urban design, management subject, and user subject.

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Dredged Canals, Wetland Loss, and Legacy

Turner,

Ohimain

2024

Estuaries and Coasts

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The direct effects of converting coastal wetlands to open water by dredging them can be magnified by indirect effects. For example, dredged canals allow for recovery of mineral fluids 1000 s of m belowground which may induce geological subsidence or faulting; the dredged material deposited at the surface creates levees that redirect overland water flows. These indirect factors may stress wetland plants enough so that additional wetland habitat is converted to open water as a result of longer intervals of wetland soil waterlogging and drying, sulfide toxicity, less organic matter and sediment accumulation, and greater erosion. We quantified the indirect effects by demonstrating a robust dose–response relationship between coastal land loss and canal density in the Mississippi and Niger river deltas over 5 decades. Importantly, the ratio of land loss to canal area increases with time—a legacy effect. Surface impediments to water movements rather than belowground subsidence are the dominant causal factor. We also found that flood protection levees on the main river channel did not significantly magnify the effect of dredging on wetland loss. The cumulative effect of these direct and indirect consequences in coastal Louisiana is enormous and continuing, equaling many tens of billions dollars annually. Understanding these effects supports the rejection of a hypothesis that regional river channel flood protection levees or fluid withdrawal is of greater importance than the local changes in wetland hydrology. Wetland restoration/mitigation of dredging impacts on these two coasts can be implemented at a relatively low cost and quickly if this paradigm of the causes of coastal wetland losses is adopted.

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Canalization induced topographic, hydrologic, and land use changes in Olero Creek, Benin River owing to petroleum exploration activities

Cited by 3 publications

References 17 publications

Wetland Restoration Progress 39 Years After Canal Backfilling

Wetland Restoration Progress 39 Years After Canal Backfilling

Construction of 3D Design Model of Urban Public Space Based on ArcGIS Water System Terrain Visualization Data

Dredged Canals, Wetland Loss, and Legacy

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