Lake Baringo, Kenya, Bulk Density, Guelph Permeameter, TDR Measurement for Assessment of Impact of Road on Soil Properties
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| Title: | Main Title: Lake Baringo, Kenya, Bulk Density, Guelph Permeameter, TDR Measurement for Assessment of Impact of Road on Soil Properties |
| Descriptions: | Abstract: The file contains four CSV files- Meteorological station and soil sampling location coordinates, bulk density data, TDR soil moisture measurements and Guelph Permeameter measurements data. The installation of weather stations and soil sampling was conducted between 1st December 2022 and 31st January 2023 in the Lake Baringo region, Kenya.
The weather stations are installed with ATMOS41 weather stations, ZL6 data loggers and TEROS11 soil sensors. The soil sensors are installed at a depth of 10 cm, 30 cm and 50 cm at each meteor station. The 3 meteor stations are installed at three different land uses i.e. forest, managed/artificial grassland and rain-fed agricultural area. The data from the weather (meteor) station is uploaded and stored to the cloud at a time interval of every 15 minutes.
The soil sampling campaign was carried out at 3 transects of 1-kilometre length along Nakuru-Sigor road (forming a fish-bone like feature). The sampling on each transect was at 0, 250- and 500-meters distance on either side from the road edge. Additionally, the soil sampling was conduct at each meteor station and four points on each four directions from the meteor station i.e. north, south, east and west at a distance of about 500 m. A total of 33 points were sampled. The sampling parameters include; bulk density, Guelph Permeameter and TDR measurements and chemical component sampling. The sampling depth in centimetres (cm) were at 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm except the Guelph measurements were taken only on the surface for the transect points and meteor stations. Abstract: Coordinates of meteorological stations and soil sampling points The Excel CSV file contain attribute describing the 33 soil sampling point and meteor stations. The coordinates were collected using a handheld GPS (Global Position System) machine of 3-metre accuracy. This file has 11 columns for; pointid, category, label, Dist2Road, landSlope, Eastings, Northings, elevation, Longitude, Latitude and Description. The pointid column refers to GPS point numbers, note that the point are not systematic because some point were picked on different location other than the sampling location. We prefer to retain numbers because some point were consistently referred and known by their numbers, and thus to avoid confusion by the field research and assistants. However, in usage of this data, you may refer to them as you may wish. Category column refer to the point location i.e. RD for road transect, NR for off the road transect points, F for forest land use, Ag for rain-fed agricultural land use, Gr for grassland land use soil sampling points. The label column refers to the unique code assigned to each point, with the letters and numbers denoting their location i.e. Tr1, Tr2, Tr3 denotes the 1st, 2nd and 3rd transect respectively, u and d denotes whether the point is upslope or downslope of the roadside respectively, Rd denotes points road, 0, 250 and 500 denoted distance from the road which the point is on the transect. For example; Tr1u250 represents sample point on transect 1, upslope and at 250 m from the road. FMstn1, GrMstn2, AgricMstn3 represent meteor station 1 at forest, station 2 at grassland and station 3 at agricultural land use. The Dist2Road column represent perpendicular distance from Nakuru-Sigor road. The landSlope column refer whether the point is located up the slope or down the slope side of the road on the transect. The elevation column is the height above mean sea level of the point in metres. Longitude and Latitude are the geographic coordinates of the point ellipsoid WGS84. Eastings and Northings are UTM WGS84 zone 37 N rectangular coordinates. The Description column is the name and general description of the point Abstract: Bulk Density Measurements Data Sampling Procedure: The measurement were taken following the following procedure: i) Dig a hole with the following approximate measurements; length- 100, width-70 cm and depth of 70 cm. ii) Carefully drive in 3 metallic cylinders of 100 cm cubic at the depth of 0-10 cm, 10-20 cm, 20-30 cm, 30-40 cm and 40-50 cm. iii) Remove the cylinders and places each soil sample into a packaging bag. iv) Weigh the raw/wet/fresh soil and note its point ID, weight, date of sampling, depth. The sampling was done each depth at a time before moving to another lower depth. v) The soil samples were air dried for some time and then oven dried at a temperature of 105 degree Celsius for 48 hours, weighed again and the weight noted. The samples were the re- dried in the oven for another 12 hours and their weight noted. Data Description: This file has for columns; pointid, Depth, Drying, Repetition and Reading. The pointid column is the point number of the sample point. Its coordinates can be found in the Meteorological station and soil sampling location coordinates CSV file. The Depth column is the sampling depth i.e. 10, 20, 30, 40, 50 cm for each point sampled. The Drying column refers to the state at which the soil sample was at each stage of drying; Raw is the fresh or wet state, 48hrs is the drying for 48 hours and 60hrs is the drying after another 12 hours. The Repetition column refers to the cylinder number, i.e. 1 for 1st cylinder, 2 for 2nd cylinder and 3 for 3rd cylinder. The Reading column refers to the weight. Note: the 12 hours drying as to confirm all the water content had escape after the first drying, thus the weight should be equal or near about. Abstract: TDR measurements The measurements were taken using the Spectrum Field Scout TDR 150. Similar to the bulk density, the measurements were taken at the depth of 10, 20, 30, 40, and 50 cm on the freshly dug hole with the following approximate measurements; length- 100, width-70 cm and depth of 70 cm. The file has 4 columns; pointid, Depth, Repetition and Reading. The pointid refers to the GPS point number of the sample point. Its coordinates can be found in the Meteorological station and soil sampling location coordinates CSV file. The Depth column is the sampling depth i.e. 10, 20, 30, 40, 50 cm for each point sampled. The Repetition column refers to 1 for the 1st spot, 2 for the 2nd spot and 3 for the 3rd spot at each depth. The Reading column refers to the TDR reading. Abstract: Guelph Measurements Field Procedure: The procedure for measurement was as follows: i) At the sampling point, a borehole was made using the permeameter metal punch cylinder. Care is taken while removing the punch, apply water to avoid collapse of the wall. ii) Place the permeameter in the hole. Fill the permeameter with the water. Close the water filling tube and air valve tight. Fill the hole with water up to a level of 5 cm and let the water flow till the bubble comes out. Take an initial water level and start the clock. Take another reading after every 20 seconds or ever 1 minute till the 10th minute, depending on the rate of flow, 20-seconds for faster flow and 1-minute for slow flow. Move the Guelph other two spots around points and repeat the same. After finish 3 measurement for one sample point, we move to another sample points. Data description: The file has 5 columns; pointid, time, Repetition, Reading and Depth The pointid refers to the GPS point number of the sample point. Its coordinates can be found in the Meteorological station and soil sampling location coordinates CSV file. The time column refers to the time interval for taking a reading of water flow through the reservoir. The Repetition column refers to 1 for the 1st spot, 2 for the 2nd spot and 3 for the 3rd spot at the vicinity sample point. The Depth column is the depth of the borehole. The following parameters can be used for computation of the saturated hydraulic conductivity and the field of flux potential Water level = 5 cm Radius of the borehole = 3.175 cm Cross-section outer tube area in 35.17 cm2 Cross-section inner tube area in 2.18 cm2 In this campaign, we only used the outer cube that is the outer reservoir. |
Responsible Party
| Creators: | Nicodemus Nyamari (Custodian), Christina Bogner (Principal Investigator) |
| Contributor: | Andrea Kolb (Data Collector) |
| Publisher: | TRR228 Database (TRR228DB) |
| Publication Year: | 2023 |
Topic
| TRR228 Topic: | Infrastructure |
| Related Subproject: | A5 |
| Subject: | Keyword: Soil Science |
| Geogr. Information Topic: | Geoscientific Information |
File Details
| Filename: | LakeBaringoSoilMoistureDec2022.zip |
| Data Type: | Dataset - Soil Properties |
| File Size: | 18 KB |
| Date: | Available: 18.04.2023 |
| Mime Type: | application/zip |
| Data Format: | CSV |
| Language: | English |
| Status: | Raw Data |
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Constraints
| Download Permission: | Free |
| General Access and Use Conditions: | According to the TRR228DB data policy agreement. |
| Access Limitations: | According to the TRR228DB data policy agreement. |
| Licence: | [TRR228DB] Data policy agreement |
Geographic
Specific Information - Data
| Temporal Extent: | 01.12.2022, 08:00:00 - 31.01.2023, 18:00:00 | ||
| Subtype: | Natural Science Data | ||
| Instrument: | TDR [Field Scout TDR 150] Measured Parameter:
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Metadata Details
| Metadata Creator: | Nicodemus Nyamari |
| Metadata Created: | 18.04.2023 |
| Metadata Last Updated: | 18.04.2023 |
| Subproject: | A5 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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