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河龙区间水土保持措施减水减沙效益分析研究采用了“水文法”和“水保法”两种分析计算方法。“水保法”是分析研究的重点。在分析计算中，采用了１９９６ 年土地变更资料和１９９０ 年土地详查资料，并采用二阶等距抽样调查方法核实河龙区间水保措施保存面积；水保坡面措施减洪减沙效益计算采用“串联法”和“并联法”两种方法平行研究，注重了坡面与沟道、洪水与泥沙的有机联系；在计算淤地坝拦泥量的基础上，将淤地坝分为淤平坝地和正在拦洪时期坝地两部分，分别计算其减洪量，并计算了淤地坝减蚀量；水库、灌溉减水减沙量的计算分为减洪水与减常水、减洪沙与减常沙两部分。此外，还考虑了河龙区间工业、生活用水和人类活动增洪增沙对河流水沙变化的影响，尤其是人类活动增洪增沙计算，绝大多数支流采用的是实际典型调查值，增洪增沙指标比较可靠。“水保法”计算结果表明：７０ 年代河龙区间２１ 条有控支流水利水保措施及人类活动等年均减洪４ ．１７７ ～４ ．２５８ 亿ｍ ３ ，年均减洪沙１ ．７２０～１ ．７７５ 亿ｔ ；８０ 年代年均减洪４ ．１４８ ～４ ．２９２ 亿ｍ ３ ，年均减洪沙１ ．６４４ ～１ ．６４５ 亿ｔ；９０ 年代年均减洪４ ．８０５ ～５ ．３８０ 亿ｍ ３ ，年均减洪沙２
Study on the Benefit Analysis of Water and Sediment Reduction of Soil and Water Conservation Measures in Helong Range Two analytical methods of “Hydrological Law” and “Soil and Water Conservation Law” were adopted. “Soil and Water Conservation Law” is the focus of analytical research. In the analysis and calculation, the data of land change in 1996 and detailed land survey in 1990 were used, and the second-order isometric sampling method was used to verify the conservation area of water and soil conservation measures in Helong area; The method of “tandem method” and “parallel method” were used to study in parallel. The organic connection between slope and channel, flood and sediment was emphasized. Based on the calculation of silt retention volume of silt dam, siltation dam was divided into Silt dam and the dam during flood control are two parts, respectively, to calculate the amount of its flood, and calculate the amount of dam dam erosion; reservoir, irrigation and sediment reduction calculation is divided into flood and reduced water, minus Hong Sha and Chang Sha two parts. In addition, the influence of industrial and domestic water use and flood and sediment increase of human activities on river water and sediment changes was also considered. In particular, flood and sediment calculation of human activities was taken into consideration. Most of the tributaries adopted the actual typical survey value. Hong Zeng Sha indicators more reliable. According to the “Soil and Water Conservation Law”, the calculation results show that in the 1970s, there were 21 flood control and water conservancy measures and other human activities in the Heilong District, such as an average annual reduction of 4 floods. 177 ~ 4. 25.8 billion m 3, annual average flood reduction 1. 720 ~ 1. 77.5 billion tons; average annual flood reduction in the 1980s 4. 148 ~ 4. 292 billion m 3, annual average flood reduction 1. 644 ~ 1. 645 billion t; average annual flood reduction in the 1990s 4. 805 ~ 5. 38 billion m 3, annual average flood reduction 2