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Field Observations of Diamond and Bendix Geysers, Korako, New Zealand

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Field Observations of Diamond and Bendix Geysers, Korako, New Zealand 127 14th New Zealand GeothermalWorkshop 1992 FIELD OBSERVATIONS OF DIAMOND AND BENDIX GEYSERS, KORAKO, NEW ZEALAND Koenig Geothermal Institute, University of Auckland was obtained to attempt field measurements on two geysers in the Orakei Korako geothermal area of New Zealand. The data obtained include temperature profiles, eruption height measurements, and time intervals between and during eruptions. These data are to be used MULKOM numerical modelling of geyser behavior and the predicted results willbe matched against the observed patterns. Work on the computer simulation is in progess. The data collected on the geysers are presented in this paper. INTRODUCTION ORAKEI KORAKO Geysers are one of the rarest geological features, Orakei Korako is located nearly halfway between and they are as unique as No two Rotorua and Taupo, in the heart of the Taupo geysers exhibit the same behavior, due to virtually Volcanic Zone. (Fig. 1) Lloyd (1972) gives a endless combinations of factors such as water detailed description of Orakei Korako; Hedenquist supply, heat supply, and underground geometry. (1986)summarizes information on this field. However, despite the variety seen in geyser behavior, theoretical models have been put forth to Hydrothermal activity occurs over a 1.8 area. examine the basic principles which govern the The heat flow from Orakei Korako is calculated to geyser eruption process. Allen and Day, be 340 and the measured fluid discharge is at 1935; Steinberg, et al., 1981; Weir, et al., 1992) least (Lloyd, 1972). The heat output Simple laboratory models have been used to test of the geothermal field is associated with the and modify geyser theories. (Anderson, et al. 1978; multiple rhyolite domes of the Volcanic Steinberg, et al, 1981;Saptadji and Freeston, 1991) Center, located immediately west of Orakei Korako. Numerical modelling is another way to test ideas. (Saptadji, et al, unpublished) Orakei Korako is an excellent example of a fault controlled geothermal field, with hot spring and The next test of geyser models must be comparison geyser activity distributed along numerous with the behavior of actual geysers. This requires Holocene faults. (Fig. 2) It is bounded to the north the collection of field data ,but there are several by Whakaheke Fault, and to the south by obstacles to this Equipment must be able to Matangiwaikato Fault. The faults in Orakei withstand a high temperature, high pressure Korako are branches of the Paeroa Fault, and are geothermal environment and its associated corrosive normal, northeast-southwest trending, and gases. Care must be taken when instrumenting a downthrown to the northwest. (Lloyd, 1972) geyser, to insure minimum interference with its normal operation. This is to avoid collection of DIAMOND GEYSER misleading data, as well as to prevent damage the geyser. Research is often limited in geyser tourist Diamond Geyser is a pool geyser associated with areas, due to fear of damage to the attractions, and the Rainbow Fault. (Fig. 2) It is also less areas may be remote, with poor access popularly known as Spring 95. It has an and limited electrical supply. irregularly shaped basin, which is 1.6 m by 1.7 m at the surface and 3.7 m deep. (Lloyd, 1972) The Two geysers in Orakei Korako, New Zealand were basin is covered with silica sinter, an indication of selected for field monitoring. Temperature profiles a deep chloride water with depth, eruption height, and time intervals between and during eruptions were recorded. These Eruptions from Diamond Geyser may last minutes data are presented in this and will be used for or hours. It plays up to 3-4 m in height, though numerical modelling of geyser behavior. occasionally water may be ejected up to 8-9 m. Most of the water returns to the vent after (and during) an eruption, but some runs down its sinter terraces. 128 Fig. 2 Distribution of surfacefeatures in Korako (after 1972) Fig 1. Location of Orakei Korako (Lloyd, 1972) Field Measurements The is defined as: Three K-type thermocouples were inserted in to Diamond Geyser at depths of approximately and 3 meters below the surface of its pool. Fishing is the sample covariance between two weights were used to prevent the thermocouples where series been shifted behind k time from being thrown out of the geyser. Temperatures units relative to series S represents the sample at the three depths were measured and standard deviation of a A perfect positive second for approximately 23 minutes, using a correlation yields r = 1; for a perfect negative Campbell Scientific 21X Micrologger. correlation r = -1. If there is no correlation r = 0. A significant correlation exists if the value of r Data falls outside the limits of where n is the During monitoring, Diamond Geyser erupted the number of overlapping points in the two series. continuously to a height of about 0.5 m above its The results of calculations, for offsets (k) surface. Water was thrown to 1.5 m. ranging from -30 to are shown in Figure 4. The temperature obtained were smoothed data using The dotted lines in Figure 4 mark the limits of a five point moving average technique. Figure 3 three significance. It is seen that shows the data obtained during minutes of the correlation exists between the temperature series at eruption,representative of collected. a depth of 3 m and either temperature series at 2 or m. (Figs Statistical Analysis As no clear patterns or cycles emerged from this One possible physical explanation for this lack of data, the statistical correlations between correlation is the presence of some sort of temperatures at the different depths were calculated- convection that separates the deeper water from the A computer program for the analysis of time shallower water. was used to determine the cross-correlation coefficient between two series at various offsets (lags) in time. Fig. 3 Temperature profile Diamond Geyser during eruption 108 107 106 smoothed data a 105 2m depth 104 3m 103 102 101 I 0 1 2 3 time (min) 129 (a) correlation: 2 m,2.5 series ..................... ................................................... correlation: 2 3 series ........................ ................ .......... ..................... .......................................................... - 1 -20 -10 0 10 20 Fig. 4 Crosscorrelation coefficientof temperature series vs. offset Diamond Geyser 2.5 m serlcs lays 2 scrles lag 0 ................... I I I I I -10 0 20 . Correlation coefficient vs offset 2 m, 2.5 m series Diamond Geyser (from Fig. 4a) 130 There is a stronger correlation for the 2 and 2.5 m in the southwest portion of the basin, there are series, with the correlation highest (r = at a lag large splashes of water that sometimes are ejected of +5. (Figs. 4a, 5) This means that when the 1-1.5 m high and reach above the rim of the basin. temperatures in the 2.5 m series are shifted to lag Temperatures there 102 behind the 2 m series by an offset of seconds, the series have the strongest mathematical relation. Field Measurements This result was not expected, as it was thought that The same pipe has been in place since and is if a relation existed, any pattern in a deeper now quite Several holes have been rusted temperature series would be repeated at a later point in the pipe, which allow water and steam to escape. in time by a shallower series. This may indicate However, they also offered the opportunity to place some counterflow is occurring, but no physical K-type thermocouples along the length of the pipe explanation for this is put forth at this time. to obtain a temperature profile in the conduit. were clamped in place at the open BENDIX GEYSER end of the pipe ,taken as 0 meters, and at depths of 1.18 m and 2.26 m. A fourth thermocouple was Bendix Geyser, also known as and Spring wrapped with wire and tied to fishing weights (to 708, is located along the Golden Fleece Fault. prevent ejection), inserted at the top of the pipe, (Fig. 2) Bendix is an excellent example of a and lowered to a depth of 5.7 m. Constrictionsin columnar or pipe geyser because it is literally a the channel prevented lowering it any farther. One pipe. The geyser was created in 1961 by Ted additional thermocouple was dropped into the Lloyd, by the insertion and concreting of a pipe fissure in the southwest portion of the basin, and into the basin of a hot spring. The pipe allows a left at a depth of approximately 3.5 m from the top column of water to boil and erupt water and steam of the pipe. as a geyser. A Pitot static tube was clamped in place through a The pipe visible in the basin is 2.34 m long, with hole in the pipe at a depth of 1.39 m. PVC tubing a diameter of 11 cm. The basin is 6.4 by 3.5 m, connected the Pitot tube to a 0 - 30 psi and 2.5 m deep, elongated in the NE-SW direction, differential pressuretransducer, which with a fissure running along this axis (the same allowed the differential pressure to be recorded, trend as the faults in the rest of the geothermal along with temperature measurements, on the field). It is located about 180 m southwest of the Campbell Scientificlogger. Golden Fleece Terrace, and the warm ground in between is known as the Dead Area. Lloyd (1972) Temperatures and differential pressure were describes geological conditions beneath this tract of measured every ten seconds. The data were ground where impervious sinters are intersected by if the temperature reading at the bottom of the pipe SSW trending faults and fractures, slope gently was equal to or exceeded an indication of west, and are overlain by 1-4 feet of Taupo imminent activity.
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