hereinafter , embodiments of this disclosure will be described with reference to the accompanying drawings . in the following description , the same elements will be designated by the same reference numerals although they are shown in different drawings . further , in the following discussion , a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of this disclosure rather unclear . while an embodiment of this disclosure will be described hereinbelow , it is apparent that the technical spirit of the inventive concept is not limited to the embodiment described , but may be properly carried out by those skilled in the art in light of the appended claims . fig1 is a front view of a groundwater profile monitoring system according to an embodiment . fig2 is a view illustrating a driving unit of the groundwater profile monitoring system according to an embodiment . hereinafter , the groundwater profile monitoring system 100 according to an embodiment of this disclosure will be described with reference to fig1 and 2 . the groundwater profile monitoring system 100 according to an embodiment includes a driving unit 110 , a groundwater sensor 140 , a power supply unit 150 , and a data logger 160 . the driving unit 110 includes a sensor cable 118 to move the groundwater sensor 140 connected to one end of the sensor cable 118 vertically , i . e . in an upward / downward direction of fig1 . in more detail , the driving unit 110 includes a winding part 112 configured to be rotated about a shaft inserted into a center thereof to wind a cable 118 therearound and a winding motor 114 configured to rotate the winding part 112 . the winding part 112 and the winding motor 114 are supported by a support frame 116 . the driving unit 110 includes a controller 115 configured to control a driving interval and a rotating direction of the winding motor 114 . the controller 115 drives the winding motor 114 at a predetermined time interval to move the groundwater sensor 140 upward and downward . the groundwater sensor 140 senses a state of groundwater . in more detail , the groundwater sensor 140 collects information about a water level , a temperature , an electric conductivity , a tds ( total dissolved solids ), a do ( dissolved oxygen ), etc . and transmits the information to the data logger 160 . then , the groundwater sensor 140 may be set to sense states of the groundwater at a predetermined time interval , and preferably includes a wireless communication means for transmitting collected information to the data logger 160 . the groundwater sensor 140 may include its own depth sensor for measuring a depth of its location . in this case , a depth of the groundwater sensor 140 may be identified without using a below - described depth measurer 130 . the power supply unit 150 may be realized by a photovoltaic power generation means or a solar thermal power generation means for producing electric power using solar energy . preferably , the power supply unit 150 is realized by a photovoltaic power or solar thermal power generation means including a capacitor . the power supply unit 150 supplies the produced electric power to parts , such as the driving unit 110 and the data logger 160 , which require electric power . when the power supply unit 150 is realized by an electric power generation unit which uses solar energy , the groundwater profile monitoring system 100 according to an embodiment may be easily installed even in an area having no electric facility and to which electric power cannot be supplied easily . the groundwater profile monitoring system 100 according to an embodiment drives the driving unit 110 and the data logger 160 at a predetermined time interval , significantly reducing power consumption . accordingly , even when the power supply unit 150 is realized by a photovoltaic power or solar thermal power generation means showing a difference between amounts of generated electric power depending on a change in weather , electric power may be stably supplied to the parts to which electric power should be supplied by using the already generated and accumulated electric power . the data logger 160 receives sensing information sensed and collected by the groundwater sensor 140 , and transmits the sensing information to a server ( not shown ). the data logger 160 is configured to transmit and receive data to and from the groundwater sensor 140 and the server ( not shown ) through a wireless communication means . for example , the data logger 160 may include a cdma ( code division multiple access ) modem to transmit and receive data using the cdma modem . the data logger 160 is configured to transmit an emergency signal to a manager or a user through the cdma modem when electric power of a predetermined level cannot be supplied or data cannot be smoothly transmitted or received due to a failure of a device which can be caused by lightning . fig3 is a view illustrating a part of the driving unit of fig2 . fig4 is a side view illustrating the driving unit of fig2 . fig5 is a view for explaining a structure of a cable guide . the driving unit guides the sensor cable 118 so that the sensor cable 118 can be uniformly wound on the winding part 112 and prevents the sensor cable 118 from being intensively wound only on one side of the winding part 112 . to achieve this , the driving part 110 further includes a cable guide 120 and a unit for driving the cable guide 120 . hereinafter , the cable guide 120 and the unit for driving the cable guide 120 will be described in detail with reference to fig3 to 5 . the cable guide 120 includes a groove for preventing the sensor cable 118 from being separated from the cable guide 120 while moving to the right and to the left to guide a location where the sensor cable 118 is wound . as illustrated in fig5 , the cable guide 120 may have a form where a bearing is interposed between an inner race and an outer race , but also may have a form where an inner race is rotated by the sensor cable 118 and a feeding cable 126 is connected to an outer race . the cable guide 120 is moved to the right and to the left along an axial direction of the guide rail 122 while being connected to the guide rail 122 . then , the guide rail 122 is coupled to and supported by the support frame 116 and disposed parallel to an axial direction of the winding part 112 . feeding cables 126 are respectively connected to opposite side surfaces of the cable guide 120 , i . e . a left side surface and a right side surface of the cable guide 120 of fig3 . the feeding cables 126 are respectively pulled by a pair of guide motors 124 installed on the right and left sides of the groundwater profile monitoring system 100 respectively , so that the cable guide 120 can be moved to the right and to the left . then , a pair of movement restrictors 128 disposed opposite to each other may be coupled to the guide rail 122 . the movement restrictors 128 prevent the cable guide 120 moved to the right and to the left along a guide rail 122 from being deviated from a winding range of the winding part 112 . that is , the movement range of the cable guide 120 is restricted by the movement restrictors 128 . the movement restrictors 128 are disposed at locations corresponding to the right and left sides in the winding part 112 which are spaces for winding the sensor cable 118 . meanwhile , a pair of guide motors 124 for moving the cable guide 120 is selectively driven under the control of the controller 115 . to achieve this , the movement restrictor 128 includes an approach detector 130 configured to transmit a sensing signal to the controller 115 when the cable guide 120 approaches within a predetermined distance . when receiving the sensing signal , the controller 115 stops a guide motor 124 which is being driven and drives a guide motor 124 on an opposite side to allow the cable guide 120 to move in a direction opposite to its travel direction . for example , the right guide motor 124 remains stopped while the left guide motor 124 installed on the left side of fig2 is driven to pull the cable guide to the left . in this state , if the cable guide 120 continues to move to the left so that the approach detector 130 detects an approach of the cable guide 120 , the sensing signal is transmitted to the controller 115 and the controller 115 stops the left guide motor 124 which is being driven and drives the right guide motor 124 . if the right guide motor 124 is driven , the cable guide 120 is pulled and moved to the right . in this way , the cable guide 120 is reciprocally moved to the right and to the left to allow the sensor cable 118 to be uniformly wound on the winding part 112 . the movement restrictor 128 may include a changeover switch ( not shown ) contacting the cable guide 120 to be operated instead of the approach detector 130 , so that the guide motors 124 can be selectively driven by the controller 115 having received a contact signal of the changeover switch . meanwhile , the cable guide 120 further includes a depth measurer 132 configured to measure a winding length of the sensor cable 118 and calculate a depth of the groundwater sensor 140 inserted into a tube well . the depth measurer 132 may be realized by equipment such as a unit having a reel contacting the sensor cable 118 to be rotated or an encoder . the depth information of the groundwater sensor 140 measured by the depth measurer 132 is transmitted to the data logger 160 through a wireless communication means installed in the depth measurer 132 . fig6 illustrates an example of the groundwater sensor , and fig7 illustrates an example of the data logger . the groundwater sensor 140 and the data logger 160 may be realized by the products manufactured as shown . while the inventive concept has been shown and described with reference to certain embodiments thereof , it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims . accordingly , the embodiments and accompanying drawings disclosed herein are not intended to restrict the technical spirit of the this disclosure , but are intended to help explain the inventive concept . the scope of this disclosure should be construed by the following claims and all the technical spirits corresponding the equivalents should be construed to fall within the scope of the inventive concept .