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Effect of Urbanization on the Groundwater Discharge Into Jakarta Bay

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Effect of Urbanization on the Groundwater Discharge Into Jakarta Bay Trends and Sustainability of Groundwater in Highly Stressed Aquifers (Proc. of Symposium JS.2 at 233 the Joint IAHS & IAH Convention, Hyderabad, India, September 2009). IAHS Publ. 329, 2009. Effect of urbanization on the groundwater discharge into Jakarta Bay YU UMEZAWA1, SHIN-ICHI ONODERA2, TOMOTOSHI ISHITOBI3, TAKAHIRO HOSONO4, ROBERT DELINOM5, WILLIAM C. BURNETT6 & MAKOTO TANIGUCHI7 1 Faculty of Fisheries, Nagasaki University, 1-14 Bunkyo-machi Nagasaki, 852-8521, Japan [email protected] 2 Faculty of Integrated Arts and Sciences, Hiroshima University, 1-7-1, Kagamiyama, Higashi-Hiroshima 739-8521, Japan 3 Nara City Office, Minami 1-1-1, NijoOhji, Nara, 630-8580, Japan 4 Priority Organization for Innovation and Excellence, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan 5 Division of Hydrology, Indonesian Institute of Sciences (LIPI), JI. Sangkuriang 21/154B, Bandung 40135, Indonesia 6 Department of Oceanography, Florida State University, Tallahassee, Florida 32306-4320, USA 7 Research Institute for Humanity and Nature, 457-4, Motoyama, Kita-ku, Kyoto 603-8047, Japan Abstract At Jakarta city in Indonesia, an increase of chemical fertilizer input in suburban areas and over- abstraction of groundwater at unregistered wells have caused many groundwater-related problems such as - NO3 contamination in the shallow aquifer and seawater intrusion in coastal areas. Because groundwater is an essential carrier of land-derived nutrients into adjacent aquatic ecosystems, as well as river water, it is important to understand the effect of urbanization on the submarine groundwater discharges into coastal areas. In this study, we carried out continuous 222Rn and SGD measurements at a fixed location and along the coast of Jakarta Bay in March, 2008. Rn concentrations in groundwater in coastal areas were mostly similar to those in the lower reaches of a nearby river, suggesting that Rn may not be an effective tool as an indicator of groundwater discharge in coastal waters off Jakarta city. However, 222Rn activities were low along the reclaimed land areas (i.e. 0.8–3.0 dpm/L) around the centre of the city, while the values increased up to 6.0 dpm/L along the coast line with natural mangrove vegetation in western suburban areas. 222Rn and conductivity signatures suggested that an increase of Rn around suburban areas can be caused by river water (likely groundwater fed) rather than direct discharge of groundwater. The estimated minor contribution of groundwater to the terrestrial water flux into the ocean corresponds to the observed decline of hydraulic potential caused by urbanization in the Jakarta city area. Key words SGD (Submarine Groundwater Discharge); Jakarta; 222Rn; urbanization INTRODUCTION Demographic and social trends suggest that past practices leading to coastal nutrient enrichment in developed cities are likely to be repeated in the coming decade in the developing countries of Asia. Total nitrogen load, including natural nitrogen fixation, increased in Asian megacities by a factor of 3.8 between 1961 and 2002, and is predicted to become up to 1.3 or 1.6 times the present load across the entire region by 2020 (Shindo et al., 2006). Jakarta is one of the representative megacities in Asia, and characterized by a high population density (>10 000 km2) and rapid urbanization in these decades (Jago-on et al., 2009). Jakarta Bay is an open bay attached to Jakarta city, and is connected to the Java Sea. In recent years, severe water pollution accompanied by red tides and an oxygen-depleted water mass has been frequently observed in Jakarta Bay, probably due to an increase of land-derived nutrients supply through several major coastal rivers (Susanna & Yanagi, 2002). However, the contribution of groundwater as an agent carrying terrestrial nutrients into the Bay has yet to be investigated in this area, despite the observed importance of submarine groundwater discharge (SGD) in other areas (Burnett et al., 2009). Several methods for measurements of SGD have been employed, including seepage meters (Taniguchi 2002), piezometers (Ullman et al., 2003; Andersen et al., 2007), thermal infrared imagery analysis (Duarte et al., 2006; Johnson et al., 2008), resistivity measurement (Taniguchi et al., 2006) and geochemical/geophysical tracers (Cable et al., 1996; Moore et al., 1996; Burnett et Copyright © 2009 IAHS Press 234 Yu Umezawa et al. al., 2001; Burnett & Dulaiova, 2003). SGD monitoring using a seepage meter, piezometers and resistivity measurements gives us precise information, but can only cover a limited area of the seabed, and a large scale study requires many deployments that can be time consuming and inefficient. On the other hand, a number of methods based on the use of geochemical tracers such as Rn and Ra isotopes provide an assessment of SGD that integrates over a larger area. Therefore, studies combining multiple methods would be useful (Burnett et al., 2006). At Jakarta Bay, a preliminary survey was conducted by our group using automated seepage meters, salinity loggers and resistivity monitoring at a sandy beach (station 3 in Fig. 1) during the dry season, September 2007, but any symptom of SGD was not observed. The objective of the present study was: (1) to check SGD combining the automated seepage meters and 222Rn monitoring during the rainy season at the beach, where SGD was not observed in the dry season, (2) to monitor spatial variation of SGD over wide areas, which cover whole the coastal line of Jakarta city, and finally (3) to understand the relationships between urbanization and SGD characteristics. STUDY AREA Jakarta, the capital of Indonesia, is located in the lowland on the north coast of western Java (6°7–22′S, 106°40–55′E) (Fig. 1). Jakarta city consists of homogeneous urbanized areas, while a Fig. 1 Location of the study site and observation wells. Effect of urbanization on the groundwater discharge into Jakarta Bay 235 mixture of residential and agricultural areas spread outside the city (Murakami et al., 2005). The base of the aquifer system in the southern areas and the southern boundary of Jakarta basin consist of an impermeable Tertiary formation, although this formation does not extend beneath Jakarta city, probably due to a fault or erosion. Volcanic fan deposits with relatively high permeability lie over much of this Tertiary base in the southern area. The lower part of the thick basin fills at depths of 50–300 m along the coast, and consists of irregularly alternating layers of permeable volcanic deposits and Pleistocene marine clays of low permeability. These layers are connected and could allow groundwater flow between each other (Lubis et al., 2008). A thin Holocene sequence of marine and flood plain deposits covers these layers. The main river, Ciliwung River, which has about 347 km2 basin area and about 500 × 106 m3 discharge rate to the ocean (Djadjadilaga et al., 2008), flows northward through central Jakarta, and there are many other small streams (e.g. Sunter River, Cipinang River and Krukut River) flowing to Jakarta Bay. River discharge rate to annual rainfall, which is between 1500 mm and 2500 mm, is roughly estimated to be 40 or 50%, depending on the frequency of heavy rainfall and flood conditions. Along the coast line, industrial plants, hotels and an amusement park are located on the reclaimed areas, and there is some natural vegetation in suburban areas (St. 1, Fig.1). METHODS 222Rn measurements in groundwater and river water To check if 222Rn is applicable as an indicator of groundwater or river water in the Jakarta city area, water samples for 222Rn analysis were collected from seven observation wells (St. A–G, Fig. 1), 1 dug well (St. G, Fig. 1) and in the lower reaches of a major river, Ciliwung River from 26 February to 1 March, 2008. 222Rn measurements were conducted using a commercial Rn-in-air detector (RAD-7, Durridge Co.) which determine the activity of 222Rn by collection and measurement of the α-emitting daughter, 218Po. Briefly, after enough purging with desiccator to dry out the system, 250-ml water samples were aerated in the closed system (RAD-H2O, Durridge Co.) using the pump equipped with RAD-7. Then, radon in air, which was equilibrated with the dissolved radon in the water phase depending on the temperature, was determined by the detector, and converted to the activity in the original water sample. Survey of SGD flux at a beach located in Jakarta bay Continuous heat-type automated seepage meters (i.e. vented benthic chambers to automatically measure water flow based on the effect of heat convection caused by water flow: Taniguchi & Iwakawa, 2001) were deployed at four stations (20 m, 30 m, 40 m and 50 m from the beach line: Fig. 2) along a transect perpendicular to the beach (Station 3: Fig. 1) from 25 February to 4 March 2008. Fig. 2 Setting design of instruments along a transect line. 236 Yu Umezawa et al. 222Rn activity in the water column was continuously monitored from 3 March to 4 March at the 40 m location from the beach (Fig. 2), using an automated multi-detector system that consists of a submersible pump, closed air loop, spray chamber (making equilibrium of Rn between air and water), desiccator, and three sets of RAD-7 detectors. Seawater from about 1.0 m below the surface was introduced into the system at approximately 5 L/min, and the three RAD-7 placed in parallel were operated in 20-minute cycles (Lane-Smith et al., 2002; Dulaiova et al., 2005). 222Rn measurements along coast line To survey the spatial distribution of SGD, surface seawater was continuously pumped up to the detection system on the boat, which was run at a slow speed (6–8 km h-1), and Rn activity was monitored using the automated multi-detector system in a similar manner to the time-series monitoring.
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