Monitoring of Rainfall Infiltration to Under Surface Using DC Resistivity Method Nanang Dwi Ardi (a), Mimin Iryanti (a), Eleonora Agustine (b), Cahyo Puji Asmoro (a), Ahmad Yusuf , Anggia Nur Abiyyah Sundana, Hani Yusrina Safura, Mardiannisa Fitri, Meliza Anggraeni, Rizky Kurniawan, Rossy Afrianti, Sumarni
a) Physics Program, Universitas Pendidikan Indonesia
b) Geophysics Program, Universitas Padjajaran
Abstract
The use of non-agricultural land in Universitas Pendidikan Indonesia causes the land absorption to be smaller than the use of soil for agriculture so that it can lead to surface runoff. This study discusses how to monitor rainwater infiltration to subsurface using resistivity method with Wenners configuration. Data retrieval takes place twice with a span of two months and is in the same place. The first taking was conducted on Saturday, October 14, 2017 at coordinates 6 51 38.46 S and 107 35 21.05 E with data obtained in the form of three trajectories. The second data retrieval takes place on Tuesday, December 12, 2017 for track 1, on Saturday 16 December 2017 for track 2 and Sunday of December 17, 2017 for the 3rd track. The second data collection is not held in one day due to weather conditions at that time it was raining. The results show that the comparison of visualization results of one and two data retrieval looks quite contrasting. In the first data-visualization drawing, it is clear that rainfall infiltration does not spread evenly. While on the second data retrieval, rain water infiltration spread evenly with rock layers whose volume is getting thinner. This is due to the infiltration process due to the high rainfall intensity at the time before the second data collection. In the model is also seen when the layer of purple rocks have decreased in volume from the first data retrieval on the second data retrieval. While the rain water infiltration layer more evenly. Monthly weather reference data showed that temperature and evapo-transpiration relationships over the months showed that temperature and evapo-transpiration results from September to December were relatively stable with average temperatures of four months being 22.38 0C and evapo-transpiration was 5.02 cm / month. Therefore, the evaporation caused by all water, soil, vegetation and the earths surface located at Universitas Pendidikan Indonesia is 5.02 cm / month. Monitoring of rainfall infiltration within two months from the first measurement having rainfall infiltration of 3.9 mm / h indicates that infiltration rate is very fast and the magnitude of evapotranspiration is 5.02 cm / month.
