Quantifying spatial and temporal trends in beach–dune volumetric changes using spatial statistics

Eamer, Jordan B.R.; Walker, Ian J.

doi:10.1016/j.geomorph.2013.03.005

Cited by 24 publications

(15 citation statements)

References 20 publications

(31 reference statements)

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“…The local indicators of spatial autocorrelations (LISA) method is used in the natural sciences to find out statistically qualifying spatial patterns [15,16]. The local Moran's I statistic is used to identify the level of spatial autocorrelation based on a given geographical variable with respect to its neighbors [15,16], and it has been successfully implemented in many previous research projects related to environmental variables [16][17][18][19][20]. Further, LISA clusters support the identification of hotspots and cold spots [15].…”

Section: Introductionmentioning

confidence: 99%

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Application of Geospatial Techniques for Groundwater Quality and Availability Assessment: A Case Study in Jaffna Peninsula, Sri Lanka

Gunaalan

Ranagalage

Gunarathna

et al. 2018

IJGI

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Groundwater is one of the most important natural resources in the northern coastal belt of Sri Lanka, as there are no major water supply schemes or perennial rivers. Overexploitation, seawater intrusion and persistent pollution of this vital resource are threatening human health as well as ecosystems in the Jaffna Peninsula. Therefore, the main intent of the present paper is to apply geospatial techniques to assess the spatial variation of groundwater quality and availability for the sustainable management of groundwater in the coastal areas. The electrical conductivity (EC) and depth to water (DTW) of 41 wells were measured during the period from March to June 2014, which represents the dry period of the study area. Surface interpolation, gradient analysis, a local indicators of spatial autocorrelations (LISA) and statistical analysis were used to assess the quality and availability of groundwater. The results revealed that the drinking and irrigation water quality in the study area were poor and further deteriorated with the progression of the dry season. Good quality and availability of groundwater were observed in the western zone compared to other zones of the study area. A negative correlation was identified between depth to water and electrical conductivity in the western zone. Hence, relatively deep wells in the western zone of the study area can be used to utilize the groundwater for drinking, domestic and agricultural purposes. The outcomes of this study can be used to formulate policy decisions for sustainable management of groundwater resources in Jaffna Peninsula.

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Section: Introductionmentioning

confidence: 99%

“…J. Geo-Inf. 2018, 7,20 12 of Scatter plots between electrical conductivity and depth to water in March, April, May, and June.…”

mentioning

confidence: 99%

Application of Geospatial Techniques for Groundwater Quality and Availability Assessment: A Case Study in Jaffna Peninsula, Sri Lanka

Gunaalan

Ranagalage

Gunarathna

et al. 2018

IJGI

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“…Generally, one central profile with additional profiles on each side is surveyed from the low water line to the foot of the dune every day during low tide. However, large differences in topographic response to the incoming hydrodynamics may exist alongshore (Eamer and Walker, 2013;Fernández-Fernández et al, 2016;Cohn et al, 2017). Therefore, profiles may be insufficient to represent the beach morphology, especially when the profile spacing is > 100 m (Swales, 2002;Bernstein et al, 2003;Pietro et al, 2008).…”

Section: Net Transport Reflected On Topographic Changesmentioning

confidence: 99%

Optimizing measurements of sediment transport in the intertidal zone

Brand

Chen

Montreuil

2020

Earth-Science Reviews

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The intertidal beach is very dynamic and is characterized by high sediment transport rates which may result in large topographic changes. Measuring techniques are well developed for both sediment transport and beach topography but the quantification of transport remains difficult. This paper provides an in-depth review of studies that cross-checked sediment transport measured underwater to transport derived from topographic change and/or predictive formulas to optimize future measuring campaigns in the intertidal zone. Based on these studies it is strongly recommended to measure sediment transport at multiple locations in the intertidal zone, although it is recognized that this is costly. When the suspended sediment is mixed and vertically stratified, it should be gauged over the entire water column. Acoustic backscatter intensity can be used for this purpose but needs to be corrected for grain size and turbulence. When cross-checking measured sediment transport rates with beach volume changes topographic profiles may not be sufficient. Instead, laser scanning of the beach is recommended. Additionally, valuable insights can be obtained from continuously measuring the beach topography. When beach topography is only measured during low tide, wind-driven transport should be taken into account during energetic conditions. It is deemed necessary to improve sensors to measure bed load transport and suspended sediment transport close to the bed and to further improve formulas to predict sediment transport. With the suggestions given in this paper it is encouraged to perform field investigations of sediment transport in the intertidal zone to improve our knowledge of the intertidal beach morphodynamics.

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“…The significance of I in each SU was assessed through a pseudo p value generated using n (= 10000 in the present study) random permutations of the neighbouring array elements of the particular SU (Anselin et al, 2006). Additionally, to quantify clusters of extreme values of y, we decomposed the global measure into a set of local Moran's I values (Anselin, 1995;O'Sullivan and Unwin, 2010;Eamer and Walker, 2013;Dekavalla and Argialas, 2018;Yuan et al, 2018). The local I for a variable y was calculated as follows (after Anselin, 1995):…”

Section: Spatial Arrangement Of Fractal Parametersmentioning

confidence: 99%

Process inference from topographic fractal characteristics in the tectonically active Northwest Himalaya, India

Sahoo

Singh

Jain

2020

Earth Surf Processes Landf

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Topography evolves under the coupled effect of exogenic and endogenic governing factors, and their scale-(in)variant dynamics. This results in a self-affine topography across a finite range, with a characteristic fractal dimension. Fractal analysis has been used to classify geological terrains having distinct litho-tectonic settings. However, process-based understanding of the fractal behaviour of a natural landscape is still limited. The current study aims to substantiate and expand upon the present knowledge of topographic response to the complex actions of the governing factors using fractal characteristics. We examined the association between the litho-tectonic, climatic settings and the fractal characteristics of the topography in the tectonically active Northwest Himalaya. Our analysis was carried out in three separate sectors having diverse litho-tectonic settings. We used the roughnesslength method to calculate the fractal parameters (fractal dimension, D; ordinate intercept, q). The Higher and the Lesser Himalaya were found to be characterized by low D and high q, while the tectonically active Sub Himalaya was found to have moderate D and low q. The southernmost foreland alluvial plains were characterized by high D and low q. Clusters of the fractal parameters were found to be consistent in spatial pattern across the three sectors. Our results showed that the geological-geomorphological settings and the associated processes (e.g. uplift, erosion and diffusion) can be well inferred using the fractal characteristics of the topography. Further, our results implied first-order control of lithology in sustaining and shaping the topographic geometry (both its amplitude and texture) in the tectonically active Northwest Himalaya. The spatial distribution of the fractal parameters also suggested the secondary control of tectonic uplift and, to a much lesser extent, mean annual rainfall on the topographic geometry. These results collectively point to the role of complex actions of the governing factors in the landscape evolution process.

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Quantifying spatial and temporal trends in beach–dune volumetric changes using spatial statistics

Cited by 24 publications

References 20 publications

Application of Geospatial Techniques for Groundwater Quality and Availability Assessment: A Case Study in Jaffna Peninsula, Sri Lanka

Application of Geospatial Techniques for Groundwater Quality and Availability Assessment: A Case Study in Jaffna Peninsula, Sri Lanka

Optimizing measurements of sediment transport in the intertidal zone

Process inference from topographic fractal characteristics in the tectonically active Northwest Himalaya, India

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