中文摘要：

以非均质泥石流分界粒径模型和固液两相运动模型为基础，结合应用推理公式法和配方法计算泥石流流量，提出了非均质泥石流泥位特征值的计算方法。以长江上游水土保持重点治理区泥石流监测预警重点示范点四川省宁南县史家沟泥石流为例进行计算，结果表明当泥石流容重为1．80t／m^3时，史家沟10年一遇的泥位特征值最小；当泥石流容重为2．20t／m^3时，史家沟百年一遇的泥位特征值达到最大，进一步将泥位特征值计算结果与监测断面相匹配和检验分析，表明该泥位特征值计算方法是可靠的，从而为山洪泥石流防治工程规划设计和研发泥石流灾害船测预警系统提供技术支撑。

英文摘要：

Based on the critical diameter model and two-phase movement model, the method for calculat- ing the non-homogeneous debris-flow depth is suggested. The application of this calculation method to Shi- jia gully, Ninguan county, Sichuan Province, shows that debris-flow characteristic depth reaches the mini- mum value in the condition of To=1.8t/m3 and P=10%; however, it approaches to the maximum value in the condition of To=2.2t/m3 and P=1%. Moreover, the debris-flow depth is less than the height of observed cross section in diversion channel. These results are important to both control project designing and disas- ters monitoring forecasting of debris flow.