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一、自然地理概况: 涇河流域为黄河中游黄土高原之一部,北界羊圈山与北清水河等水系分界,东隔子午嶺与葫蘆河水系分界,西为六盤山与渭河支流分开,南接关山雪嶺与渭河中游水系分界,四圍山嶺环抱,形成一廣闊的內陸盆地。其中地形以西北向东南傾斜,由此决定了本流域的主要河流流向。子午嶺丘陵区海拔为1,300～1,800公尺,由北向南逐漸平緩,六盤山海拔为2,500～3,150公尺,羊圈山一帶海拔为1,900公尺,而在其中間分布之廣大塬嶺地带海拔为1,300公尺左右,由于河流水系的發展,已由塬嶺面的高程下切至250～300公尺,形成寬廣的河
I. Introduction to Natural Geography: The Jinghe River Basin is a part of the Loess Plateau in the middle reaches of the Yellow River. The boundary between the Yangquan Mountain in the northern boundary and the Beiqing River and other watercourses is delimited. The east dividing line is separated from the Huluhe River system. The west is Liupanshan and the Weihe River tributary is separated. Then off the middle of the mountains and the Weihe River water system boundary, surrounded by mountains, forming a vast inland basin. Among them, the terrain tilts from northwest to southeast, which determines the main river flow in this basin. The hilly area of Ziwu Mountain ranges from 1,300 to 1,800 meters above sea level, gradually tapering from north to south. The elevation of Liupan Mountain ranges from 2,500 to 3,150 meters and the elevation of the Yangzhu Mountain ranges 1,900 meters. In the middle of the area, About 1,300 meters, due to the development of river water system, it has been cut down to 250-300 meters from the elevation of the high ridge surface to form a broad river