Nội dung được dịch bởi AI, chỉ mang tính chất tham khảo
Hệ thống hiệu quả về mặt tính toán để đánh giá sự không ổn định của các sườn đất chưa bão hòa trong điều kiện mưa trong thời gian thực
Tóm tắt
Mục tiêu của bài báo này là để đạt được một phương pháp đánh giá có thể áp dụng và một hệ thống dự đoán dựa trên Web-GIS cho các vụ trượt đất ở khu vực. Hàm Richards truyền thống được tái cấu trúc bằng cách sử dụng đường đặc trưng của nước trong đất (SWCC) và kỹ thuật biến đổi tọa độ. Áp suất lỗ chân lông phân tích cho mô hình sườn dốc được suy ra bằng cách giải phương trình Richard đã được sửa đổi thông qua hàm Green và biến đổi Fourier. Trường áp suất lỗ chân lông thoáng qua thu được sau đó được kết hợp với lý thuyết hút ẩm của Brakensiek, để xây dựng một mô hình khái niệm cho các vụ trượt đất nông do mưa gây ra. Hệ số an toàn được xác định bằng cách giải phương trình cân bằng giới hạn của mô hình khái niệm. Phương pháp này sau đó được thực hiện trong một hệ thống Web-GIS, xem xét ảnh hưởng của các đặc điểm hình học của sườn dốc, vật liệu địa chất nền tảng, và cường độ mưa gần thực thời trong khu vực nghiên cứu. Đã được xác minh rằng phương pháp này là hiệu quả về mặt tính toán và đáng tin cậy cho các sườn dốc nhẹ và thời gian mưa ngắn. Hơn nữa, một nghiên cứu tham số toàn diện cho thấy rằng hai hệ số thông thường được sử dụng trong phương trình cường độ-thời gian đều có liên quan đến thời gian giữa các sự kiện mưa qua các hàm mũ, và thời gian sự kiện mưa qua các hàm bậc. Yếu tố có ảnh hưởng chủ yếu đến các vụ trượt đất ở khu vực là hàm lượng nước ban đầu, tiếp theo là thời gian và cường độ mưa, và yếu tố ít ảnh hưởng nhất là độ dày của đất.
Từ khóa
#đánh giá sự không ổn định #trượt đất #hệ thống Web-GIS #áp suất lỗ chân lông #mô hình khái niệm #cường độ mưaTài liệu tham khảo
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