This page has only limited features, please log in for full access.

Unclaimed
Abraham Joel
Department of Soil and Environment, Swedish University of Agricultural Sciences, P.O. Box 7014, SE-750 07 Uppsala, Sweden

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 04 February 2021 in Water
Reads 0
Downloads 0

Changes in pollution pressure exerted on the Rocha River in Bolivia from diffuse sources were assessed using potential non-point pollution indexes (PNPI) for 1997 and 2017. PNPI is a simple, low-effort, time- and resource-saving method suitable for data-scarce regions, as it works at catchment level with commonly available geographical data. Land use type (obtained by Landsat imagery classification), runoff (determined by runoff coefficient characterisation) and distance to river network (calculated at perpendicular distance) were each transformed into corresponding indicators to determine their relative importance in generating pollution. Weighted sum, a multi-criteria analysis tool in the GIS environment, was used to combine indicators with weighting values. Different weighting values were assigned to each of the indicators resulting in a set of six equations. The results showed that higher PNPI values corresponded to human settlements with high population density, higher runoff values and shorter distance to river network, while lower PNPI values corresponded to semi-natural land use type, lower runoff coefficient and longer distances to river. PNPI values were positively correlated with measured nitrate and phosphate concentrations at six sub-catchment outlets. The correlation was statistical significant for phosphate in 2017. Maps were produced to identify priority source areas that are more likely to generate pollution, which is important information for future management.

ACS Style

Benjamin Gossweiler; Ingrid Wesström; Ingmar Messing; Mauricio Villazón; Abraham Joel. Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia. Water 2021, 13, 410 .

AMA Style

Benjamin Gossweiler, Ingrid Wesström, Ingmar Messing, Mauricio Villazón, Abraham Joel. Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia. Water. 2021; 13 (4):410.

Chicago/Turabian Style

Benjamin Gossweiler; Ingrid Wesström; Ingmar Messing; Mauricio Villazón; Abraham Joel. 2021. "Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia." Water 13, no. 4: 410.

Journal article
Published: 11 November 2020 in Land
Reads 0
Downloads 0

Maintenance of agricultural drainage ditches can be difficult to optimize if farmers have no guidelines on where to target their maintenance efforts. A main concern is whether ditch banks will experience soil erosion or mass movement (failure). In order to help identify sites that are more likely to experience soil erosion and/or mass movement, soil susceptibility to detachment was assessed in this study using a cohesive strength meter (CSM) and measurements of shear strength in unsaturated direct shear tests. The results showed that soil roots play an important role in stabilizing ditch banks against mass movement and in reducing the rate of soil detachment. A positive stabilizing effect was detected by CSM and confirmed by shear strength measurements. The conclusion is that native vegetation should be maintained on ditch banks, instead of being removed during maintenance work as is currently the case.

ACS Style

Daniel Aviles; Ingrid Wesström; Abraham Joel. Effect of Vegetation Removal on Soil Erosion and Bank Stability in Agricultural Drainage Ditches. Land 2020, 9, 441 .

AMA Style

Daniel Aviles, Ingrid Wesström, Abraham Joel. Effect of Vegetation Removal on Soil Erosion and Bank Stability in Agricultural Drainage Ditches. Land. 2020; 9 (11):441.

Chicago/Turabian Style

Daniel Aviles; Ingrid Wesström; Abraham Joel. 2020. "Effect of Vegetation Removal on Soil Erosion and Bank Stability in Agricultural Drainage Ditches." Land 9, no. 11: 441.

Journal article
Published: 25 October 2019 in Water
Reads 0
Downloads 0

Increasing pressures caused by human activities pose a major threat to water availability and quality worldwide. Water resources have been declining in many catchments during recent decades. This study investigated patterns of river water quality status in a peri-urban/rural catchment in Bolivia in relation to land use during a 26 year period. Satellite images were used to determine changes in land use. To assess water quality, data in the dry season from former studies (1991–2014), complemented with newly collected data (2017), were analysed using the National Sanitation Foundation-Water Quality Index method and the Implicit Pollution Index method. The highest rates of relative increase in land use area were observed for forest, urban, and peri-urban areas, whereas relative decreases were observed for water infiltration zones, bare soil, shrubland, and grassland areas. The water quality indices revealed clear water quality deterioration over time, and from catchment headwaters to outlet. Statistical analyses revealed a significant relationship between decreasing water quality and urban expansion. These results demonstrate the need for an effective control programme, preferably based on water quality index approaches as in the present study and including continuous monitoring of runoff water, mitigation of pollution, and water quality restoration, in order to achieve proper water management and quality.

ACS Style

Benjamin Gossweiler; Ingrid Wesström; Ingmar Messing; Ana Maria Romero; Abraham Joel. Spatial and Temporal Variations in Water Quality and Land Use in a Semi-Arid Catchment in Bolivia. Water 2019, 11, 2227 .

AMA Style

Benjamin Gossweiler, Ingrid Wesström, Ingmar Messing, Ana Maria Romero, Abraham Joel. Spatial and Temporal Variations in Water Quality and Land Use in a Semi-Arid Catchment in Bolivia. Water. 2019; 11 (11):2227.

Chicago/Turabian Style

Benjamin Gossweiler; Ingrid Wesström; Ingmar Messing; Ana Maria Romero; Abraham Joel. 2019. "Spatial and Temporal Variations in Water Quality and Land Use in a Semi-Arid Catchment in Bolivia." Water 11, no. 11: 2227.

Soil erosion in the nordic countries
Published: 17 August 2012 in Acta Agriculturae Scandinavica, Section B — Soil & Plant Science
Reads 0
Downloads 0

Research on transport processes involved in P losses by subsurface flow, including artificial drainage, is becoming increasingly important. An improved understanding of the processes involved in sediment detachment and P mobility in the soil profile is needed in order to develop proper management strategies for P control. The objective of this article is to present the development of a field lysimeter technique, and a complementary laboratory pinhole test on undisturbed soil samples, that can be used to assess rates and mechanisms involved in water, sediment and phosphorus transport in the upper soil profile at different rainfall intensities. The study, performed on a silty clay, consisted of three parts: (1) pre-test of a new field lysimeter approach with the aim to observe water flow patterns and difficulties related to preparation and set-up, (2) evaluation of the improved field lysimeter methodology, which consisted of a rain simulator above ground, the soil profile through which the applied water percolated, and a collection tray at 40–50 cm depth from which the drain water and sediment was sampled, (3) evaluation and development of the pinhole test for assessing soil resistance to internal erosion. The pre-tests gave promising results and the improved field lysimeter showed interesting temporal responses, at two consecutive rain simulation intensities, in outflow rates of water, bromide, lithium, total P and dissolved P. The pinhole test was run on undisturbed samples with three different water contents and at three different applied positive pressure heads and showed fast peaks in turbidity following start of each run. Combining measurements from the in situ field lysimeter and pinhole approaches presented in this article has the potential to be valuable in detecting critical parameters that control the processes leading to subsurface leaching of P to deeper soil layers.

ACS Style

Abraham Joel; Ingrid Wesström; Jeffrey Strock; Ingmar Messing. Method for in situ measurements of water, sediment and phosphorous transport in the upper soil profile. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 2012, 62, 252 -259.

AMA Style

Abraham Joel, Ingrid Wesström, Jeffrey Strock, Ingmar Messing. Method for in situ measurements of water, sediment and phosphorous transport in the upper soil profile. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science. 2012; 62 (sup2):252-259.

Chicago/Turabian Style

Abraham Joel; Ingrid Wesström; Jeffrey Strock; Ingmar Messing. 2012. "Method for in situ measurements of water, sediment and phosphorous transport in the upper soil profile." Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 62, no. sup2: 252-259.