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Principle and application of 4D microgravity survey for engineering purpose, case example: Groundwater level lowering and subsidence in residential area of Jakarta
a ITB, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Bouguer gravity anomaly derived from observed gravity in the surface reflects all of possibilities of subsurface density change relating to their volume in its lateral and depth variation. In the time-lapse microgravity anomaly, gravity value is observed more than one measurement at certain time period. The difference between both gravity measurements, called as time-lapse microgravity, represents subsurface density contrast and station elevation change. Hence, in the area undergoing surface subsidence and high ground water exploitation, the elevation change and the ground water lowering could be a target of microgravity survey with resolution which depends on gravimeter used and its applied correction. As a case example, three (3) times of gravity measurements had been conducted in the residential area of 2 x 1 km2 with 4 to 6 months period between two (2) measurements. 168 gravity stations were carried out in the area with 50 – 100 m station spacing. In order to investigate subsidence and ground water lowering of the area, gravity gradient and water-pass elevation measurements were also used to support advance analysis. The survey result shows that all of the area undergoes subsidence with 15 cm average rate per year and more than 20 cm per year in the west part of the area. The rate of subsidence was influenced by season with the highest rate is in the dry season. In addition, it was identified the existence of ground water level lowering, sea water intrusion and compaction zone in the east part of the area.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Average rate,Bouguer gravity anomalies,Compaction zone,Depth variation,Dry seasons,Gravity gradients,Gravity measurement,Jakarta,Microgravity survey,Residential areas,Subsurface density,Surface subsidence,Time-periods[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]