圖書典藏及影音數位平台

本計畫將延續前一年度計畫「區域排水水文水理模式實驗流域觀測(1/3)」成果，擇定實驗流域，進行現地基本資料調查工作，建置試驗基地內測站觀測資料及土地利用狀況調查，透過現地高密度之水文觀測資料的檢定驗證，提供長期性水文觀測資料，如雨量、水位、水位流量、淹水、土地利用、地下水位、排水路斷面等，擇定適用於台灣地區之區域排水水文模式，並提升水理模式之精確度，進一步建置各種水文水理模式於台灣地區之適用參數。

Due to the complex drainage systems and numerous hydraulic structures in Taiwan, It cannot be correctly displayed by the current hydrological and hydraulic numerical model parameters. In order to improve the accuracy of the numerical model simulation results, it is first to select the experimental area to perform simplification of the hydrological and hydraulic analysis in the numerical mode. The observation data will provide the basis of calibration and verification for the SOBEK and HEC-HMS models, and the localized CN values of different land use patterns in the experimental area will be optimized by the procedure of calibration and verification. The first year, the project selected fish farm and dry farmland as experimental areas and observe hydrological and geographic data. Rainfall station, water level station, surface velocity station and inundation water level station are set in the two experimental areas, the CCTV devices are set in the experimental area of fish farm, and infiltration measurement station is set in the experimental area of dry farmland. The results from observations show that the fish farm is affected by manual operations. The SOBEK rainfall runoff model in the dry farmland experimental area is divided into many sub-catchment areas. And use the observation data of storm event to calibration and verification the parameters. The variation range of CN values of dry farmland experimental area is between 62 and 68. This year, the project selected the BaGu drainage systems in Hsinchu city as experimental areas. The project results are as follows. 1. Complete the relevant observation instruments in the experimental area, including 3 self-recording instant transmission stations (including water level and velocity), 2 rainfall stations and 11 self-recording water level stations (three of which can also be regarded as inundation stations), and performing geography and hydrological observations work. It have continued to collect data on typhoons and rainfall events since July. 2. Observation data From July to October, there were not much rainfalls in the catchment area of BaGu drainage systems in this year. The more obvious event was the typhoon Lekima in August. Comparing the official rain gauge data records, the overall rainfall trend is consistent with the rainfall station information. It can be confirmed that the R1 and R2 rainfall stations of this project are correct and can reflect the on-site rainfall. 3. In the real-time transmission observation data of this year, three self-recording water level and velocity observation information of the instant transmission station, the information collected by the middle stream A2 is the most stable, the velocity and water level can all reflect the rainfall situation, and only the most downstream A1 is mainly affected by the tide. The water level data collected by 11 self-recording stations can show the relationship with rainfall and provide a benchmark for model calibration and verification. 4. SOBEK and Hec-HMS model were used to construct a hydrological and hydrological model with high degree of detail. Through the observation data of the hydrological observation and land use status in the experimental area, the observation data of the current rainfall event was selected to calibrate and verify the flow and water level. To understand the impact of different land use patterns on runoff, and to recommend localized CN recommendations: farmland is 61.19; forest is 50.86; building is 67.78; vacant land is 83.64, which is localization proposal for the catchment of BaGu drainage systems. 5. The typhoon rainfall events in the BaGu drainage systems in this year are scarce, and the data on the on-site flow observation is mainly based on the typhoon Lekima. The SOBEK model, which was verified by the low flow of the Lekima typhoon event, produced the water level-flow relationship under different design rainfalls. 6. This project has set up an experimental area display platform to display the instantaneous water level, velocity and rainfall observation records of three self-recording instant transmission stations and one rainfall station. The data is recorded every 10 minutes and updated on the website. The relevant information and historical data can be inquired and downloaded through the platform webpage. The real-time observation data can also provide assistance during the typhoon attendance.